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Module: Msf::Exploit::FormatString
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<span class='title'><span class='object_link'><a href="../../Msf.html" title="Msf (module)">Msf</a></span></span> » <span class='title'><span class='object_link'><a href="../Exploit.html" title="Msf::Exploit (class)">Exploit</a></span></span>
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<span class="title">FormatString</span>
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<div id="content"><h1>Module: Msf::Exploit::FormatString
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</h1>
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<div class="box_info">
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<dl>
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<dt>Defined in:</dt>
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<dd>lib/msf/core/exploit/format_string.rb</dd>
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</dl>
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</div>
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<h2>Overview</h2><div class="docstring">
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<div class="discussion">
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<p>This mixin provides an interface to generating format string exploits in a more intelligent way.</p>
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<p>Author: jduck</p>
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</div>
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<div class="tags">
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</div>
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<h2>
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Instance Method Summary
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<small><a href="#" class="summary_toggle">collapse</a></small>
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</h2>
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<ul class="summary">
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<li class="public ">
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<span class="summary_signature">
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<a href="#fmtstr_advance_count-instance_method" title="#fmtstr_advance_count (instance method)">#<strong>fmtstr_advance_count</strong>(prec) ⇒ Object </a>
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</span>
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<span class="summary_desc"><div class='inline'>
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<p>Generate a fmt that will advance the printed count by the specified amount.</p>
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</div></span>
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</li>
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<li class="public ">
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<span class="summary_signature">
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<a href="#fmtstr_count_printed-instance_method" title="#fmtstr_count_printed (instance method)">#<strong>fmtstr_count_printed</strong>(num_printed, num_pad, num_pops, arr) ⇒ Object </a>
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</span>
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<span class="summary_desc"><div class='inline'>
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<p>Count how many bytes will print before we reach the writing..</p>
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</div></span>
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</li>
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<li class="public ">
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<span class="summary_signature">
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<a href="#fmtstr_detect_cap_dpa-instance_method" title="#fmtstr_detect_cap_dpa (instance method)">#<strong>fmtstr_detect_cap_dpa</strong> ⇒ Object </a>
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</span>
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<span class="summary_desc"><div class='inline'></div></span>
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</li>
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<li class="public ">
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<span class="summary_signature">
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<a href="#fmtstr_detect_cap_fpu-instance_method" title="#fmtstr_detect_cap_fpu (instance method)">#<strong>fmtstr_detect_cap_fpu</strong> ⇒ Object </a>
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</span>
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<span class="summary_desc"><div class='inline'></div></span>
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</li>
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<li class="public ">
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<span class="summary_signature">
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<a href="#fmtstr_detect_caps-instance_method" title="#fmtstr_detect_caps (instance method)">#<strong>fmtstr_detect_caps</strong> ⇒ Object </a>
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</span>
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<span class="summary_desc"><div class='inline'>
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<p>Detect the capabilities (only works for non-blind).</p>
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</div></span>
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</li>
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<li class="public ">
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<span class="summary_signature">
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<a href="#fmtstr_detect_exploitable-instance_method" title="#fmtstr_detect_exploitable (instance method)">#<strong>fmtstr_detect_exploitable</strong> ⇒ Object </a>
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</span>
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<span class="summary_desc"><div class='inline'>
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<p>NOTE: This will likely crash the target process.</p>
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</div></span>
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</li>
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<li class="public ">
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<span class="summary_signature">
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<a href="#fmtstr_detect_vulnerable-instance_method" title="#fmtstr_detect_vulnerable (instance method)">#<strong>fmtstr_detect_vulnerable</strong> ⇒ Object </a>
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</span>
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<span class="summary_desc"><div class='inline'></div></span>
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</li>
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<li class="public ">
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<span class="summary_signature">
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<a href="#fmtstr_gen_array_from_buf-instance_method" title="#fmtstr_gen_array_from_buf (instance method)">#<strong>fmtstr_gen_array_from_buf</strong>(write_to, buffer, targ = target) ⇒ Object </a>
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</span>
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<span class="summary_desc"><div class='inline'>
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<p>Generates and returns an array of what/where pairs from the supplied buffer.</p>
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</div></span>
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</li>
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<li class="public ">
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<span class="summary_signature">
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<a href="#fmtstr_gen_from_array-instance_method" title="#fmtstr_gen_from_array (instance method)">#<strong>fmtstr_gen_from_array</strong>(num_printed, arr, targ = target) ⇒ Object </a>
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</span>
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<span class="summary_desc"><div class='inline'>
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<p>Generates a format string from an array of value/address pairs.</p>
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</div></span>
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</li>
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<li class="public ">
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<span class="summary_signature">
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<a href="#fmtstr_set_caps-instance_method" title="#fmtstr_set_caps (instance method)">#<strong>fmtstr_set_caps</strong>(fpu, dpa) ⇒ Object </a>
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</span>
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<span class="summary_desc"><div class='inline'>
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<p>Allow caller to override the capabilities.</p>
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</div></span>
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</li>
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<li class="public ">
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<span class="summary_signature">
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<a href="#fmtstr_stack_read-instance_method" title="#fmtstr_stack_read (instance method)">#<strong>fmtstr_stack_read</strong>(offset, extra = '') ⇒ Object </a>
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</span>
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<span class="summary_desc"><div class='inline'>
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<p>Read a single 32-bit integer from the stack at the specified offset.</p>
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</div></span>
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</li>
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<li class="public ">
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<span class="summary_signature">
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<a href="#fmtstr_target_short-instance_method" title="#fmtstr_target_short (instance method)">#<strong>fmtstr_target_short</strong>(value, num_printed) ⇒ Object </a>
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</span>
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<span class="summary_desc"><div class='inline'>
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<p>Generate the number to be used for precision that will create the specified value to write.</p>
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</div></span>
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</li>
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<li class="public ">
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<span class="summary_signature">
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||||
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||||
<a href="#generate_fmt_two_shorts-instance_method" title="#generate_fmt_two_shorts (instance method)">#<strong>generate_fmt_two_shorts</strong>(num_printed, write_to, write_what, targ = target) ⇒ Object </a>
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</span>
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<span class="summary_desc"><div class='inline'>
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<p>Generates a format string that will perform an arbitrary write using two separate short values.</p>
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</div></span>
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</li>
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<li class="public ">
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<span class="summary_signature">
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<a href="#generate_fmtstr_from_buf-instance_method" title="#generate_fmtstr_from_buf (instance method)">#<strong>generate_fmtstr_from_buf</strong>(num_printed, write_to, buffer, targ = target) ⇒ Object </a>
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</span>
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<span class="summary_desc"><div class='inline'>
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||||
<p>Generates a format string that will perform an arbitrary write using two separate short values.</p>
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</div></span>
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</li>
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<li class="public ">
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||||
<span class="summary_signature">
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<a href="#initialize-instance_method" title="#initialize (instance method)">#<strong>initialize</strong>(info = {}) ⇒ Object </a>
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</span>
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<span class="summary_desc"><div class='inline'>
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||||
<p>Creates an instance of a format string exploit.</p>
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</div></span>
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</li>
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</ul>
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<div id="instance_method_details" class="method_details_list">
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<h2>Instance Method Details</h2>
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<div class="method_details first">
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<h3 class="signature first" id="fmtstr_advance_count-instance_method">
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||||
#<strong>fmtstr_advance_count</strong>(prec) ⇒ <tt>Object</tt>
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</h3><div class="docstring">
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||||
<div class="discussion">
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||||
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||||
<p>Generate a fmt that will advance the printed count by the specified amount</p>
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||||
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||||
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||||
</div>
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</div>
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<div class="tags">
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</div><table class="source_code">
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<tr>
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<td>
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<pre class="lines">
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248</pre>
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</td>
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<td>
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<pre class="code"><span class="info file"># File 'lib/msf/core/exploit/format_string.rb', line 236</span>
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||||
<span class='kw'>def</span> <span class='id identifier rubyid_fmtstr_advance_count'>fmtstr_advance_count</span><span class='lparen'>(</span><span class='id identifier rubyid_prec'>prec</span><span class='rparen'>)</span>
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||||
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||||
<span class='comment'># no need to advance :)
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||||
</span> <span class='kw'>return</span> <span class='tstring'><span class='tstring_beg'>"</span><span class='tstring_end'>"</span></span> <span class='kw'>if</span> <span class='id identifier rubyid_prec'>prec</span> <span class='op'>==</span> <span class='int'>0</span>
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||||
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||||
<span class='comment'># assuming %x max normal length is 8...
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||||
</span> <span class='kw'>if</span> <span class='id identifier rubyid_prec'>prec</span> <span class='op'>>=</span> <span class='int'>8</span>
|
||||
<span class='kw'>return</span> <span class='tstring'><span class='tstring_beg'>"</span><span class='tstring_content'>%0</span><span class='tstring_end'>"</span></span> <span class='op'>+</span> <span class='id identifier rubyid_prec'>prec</span><span class='period'>.</span><span class='id identifier rubyid_to_s'>to_s</span> <span class='op'>+</span> <span class='tstring'><span class='tstring_beg'>"</span><span class='tstring_content'>x</span><span class='tstring_end'>"</span></span>
|
||||
<span class='kw'>end</span>
|
||||
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||||
<span class='comment'># anything else, we just put some chars in...
|
||||
</span> <span class='kw'>return</span> <span class='id identifier rubyid_rand_text'>rand_text</span><span class='lparen'>(</span><span class='id identifier rubyid_prec'>prec</span><span class='rparen'>)</span>
|
||||
<span class='kw'>end</span></pre>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
</div>
|
||||
|
||||
<div class="method_details ">
|
||||
<h3 class="signature " id="fmtstr_count_printed-instance_method">
|
||||
|
||||
#<strong>fmtstr_count_printed</strong>(num_printed, num_pad, num_pops, arr) ⇒ <tt>Object</tt>
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
</h3><div class="docstring">
|
||||
<div class="discussion">
|
||||
|
||||
<p>Count how many bytes will print before we reach the writing..</p>
|
||||
|
||||
|
||||
</div>
|
||||
</div>
|
||||
<div class="tags">
|
||||
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||||
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||||
</div><table class="source_code">
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<tr>
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<td>
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<pre class="lines">
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</td>
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<td>
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||||
<pre class="code"><span class="info file"># File 'lib/msf/core/exploit/format_string.rb', line 201</span>
|
||||
|
||||
<span class='kw'>def</span> <span class='id identifier rubyid_fmtstr_count_printed'>fmtstr_count_printed</span><span class='lparen'>(</span><span class='id identifier rubyid_num_printed'>num_printed</span><span class='comma'>,</span> <span class='id identifier rubyid_num_pad'>num_pad</span><span class='comma'>,</span> <span class='id identifier rubyid_num_pops'>num_pops</span><span class='comma'>,</span> <span class='id identifier rubyid_arr'>arr</span><span class='rparen'>)</span>
|
||||
|
||||
<span class='id identifier rubyid_num'>num</span> <span class='op'>=</span> <span class='id identifier rubyid_num_printed'>num_printed</span> <span class='op'>+</span> <span class='id identifier rubyid_num_pad'>num_pad</span>
|
||||
<span class='kw'>if</span> <span class='kw'>not</span> <span class='ivar'>@use_dpa</span>
|
||||
<span class='id identifier rubyid_num'>num</span> <span class='op'>+=</span> <span class='lparen'>(</span><span class='int'>8</span> <span class='op'>*</span> <span class='id identifier rubyid_num_pops'>num_pops</span><span class='rparen'>)</span>
|
||||
<span class='kw'>end</span>
|
||||
<span class='id identifier rubyid_npr'>npr</span> <span class='op'>=</span> <span class='id identifier rubyid_num'>num</span>
|
||||
<span class='id identifier rubyid_arr'>arr</span><span class='period'>.</span><span class='id identifier rubyid_each'>each</span> <span class='kw'>do</span> <span class='op'>|</span><span class='id identifier rubyid_el'>el</span><span class='op'>|</span>
|
||||
<span class='id identifier rubyid_prec'>prec</span> <span class='op'>=</span> <span class='id identifier rubyid_fmtstr_target_short'>fmtstr_target_short</span><span class='lparen'>(</span><span class='id identifier rubyid_el'>el</span><span class='lbracket'>[</span><span class='int'>0</span><span class='rbracket'>]</span><span class='comma'>,</span> <span class='id identifier rubyid_npr'>npr</span><span class='rparen'>)</span>
|
||||
<span class='comment'># this gets popped in order to advance the column (dpa doesn't need these)
|
||||
</span> <span class='kw'>if</span> <span class='kw'>not</span> <span class='ivar'>@use_dpa</span> <span class='kw'>and</span> <span class='id identifier rubyid_prec'>prec</span> <span class='op'>>=</span> <span class='int'>8</span>
|
||||
<span class='id identifier rubyid_num'>num</span> <span class='op'>+=</span> <span class='int'>4</span>
|
||||
<span class='kw'>end</span>
|
||||
|
||||
<span class='comment'># account for the addr to write to
|
||||
</span> <span class='id identifier rubyid_num'>num</span> <span class='op'>+=</span> <span class='int'>4</span>
|
||||
<span class='id identifier rubyid_npr'>npr</span> <span class='op'>=</span> <span class='id identifier rubyid_el'>el</span><span class='lbracket'>[</span><span class='int'>0</span><span class='rbracket'>]</span>
|
||||
<span class='kw'>end</span>
|
||||
<span class='kw'>return</span> <span class='id identifier rubyid_num'>num</span>
|
||||
<span class='kw'>end</span></pre>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
</div>
|
||||
|
||||
<div class="method_details ">
|
||||
<h3 class="signature " id="fmtstr_detect_cap_dpa-instance_method">
|
||||
|
||||
#<strong>fmtstr_detect_cap_dpa</strong> ⇒ <tt>Object</tt>
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
</h3><table class="source_code">
|
||||
<tr>
|
||||
<td>
|
||||
<pre class="lines">
|
||||
|
||||
|
||||
42
|
||||
43
|
||||
44
|
||||
45
|
||||
46
|
||||
47
|
||||
48
|
||||
49
|
||||
50</pre>
|
||||
</td>
|
||||
<td>
|
||||
<pre class="code"><span class="info file"># File 'lib/msf/core/exploit/format_string.rb', line 42</span>
|
||||
|
||||
<span class='kw'>def</span> <span class='id identifier rubyid_fmtstr_detect_cap_dpa'>fmtstr_detect_cap_dpa</span>
|
||||
<span class='id identifier rubyid_res'>res</span> <span class='op'>=</span> <span class='id identifier rubyid_trigger_fmt'>trigger_fmt</span><span class='lparen'>(</span><span class='tstring'><span class='tstring_beg'>"</span><span class='tstring_content'>|%1$08x|</span><span class='tstring_end'>"</span></span><span class='rparen'>)</span>
|
||||
<span class='kw'>return</span> <span class='kw'>nil</span> <span class='kw'>if</span> <span class='kw'>not</span> <span class='id identifier rubyid_res'>res</span>
|
||||
<span class='id identifier rubyid_res'>res</span> <span class='op'>=</span> <span class='id identifier rubyid_extract_fmt_output'>extract_fmt_output</span><span class='lparen'>(</span><span class='id identifier rubyid_res'>res</span><span class='rparen'>)</span>
|
||||
<span class='kw'>if</span> <span class='id identifier rubyid_res'>res</span> <span class='op'>=~</span> <span class='tstring'><span class='regexp_beg'>/</span><span class='tstring_content'>^\|[0-9a-f]{8}\|$</span><span class='regexp_end'>/</span></span>
|
||||
<span class='kw'>return</span> <span class='kw'>true</span>
|
||||
<span class='kw'>end</span>
|
||||
<span class='kw'>return</span> <span class='kw'>false</span>
|
||||
<span class='kw'>end</span></pre>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
</div>
|
||||
|
||||
<div class="method_details ">
|
||||
<h3 class="signature " id="fmtstr_detect_cap_fpu-instance_method">
|
||||
|
||||
#<strong>fmtstr_detect_cap_fpu</strong> ⇒ <tt>Object</tt>
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
</h3><table class="source_code">
|
||||
<tr>
|
||||
<td>
|
||||
<pre class="lines">
|
||||
|
||||
|
||||
52
|
||||
53
|
||||
54
|
||||
55
|
||||
56
|
||||
57
|
||||
58
|
||||
59
|
||||
60</pre>
|
||||
</td>
|
||||
<td>
|
||||
<pre class="code"><span class="info file"># File 'lib/msf/core/exploit/format_string.rb', line 52</span>
|
||||
|
||||
<span class='kw'>def</span> <span class='id identifier rubyid_fmtstr_detect_cap_fpu'>fmtstr_detect_cap_fpu</span>
|
||||
<span class='id identifier rubyid_res'>res</span> <span class='op'>=</span> <span class='id identifier rubyid_trigger_fmt'>trigger_fmt</span><span class='lparen'>(</span><span class='tstring'><span class='tstring_beg'>"</span><span class='tstring_content'>|%g|</span><span class='tstring_end'>"</span></span><span class='rparen'>)</span>
|
||||
<span class='kw'>return</span> <span class='kw'>nil</span> <span class='kw'>if</span> <span class='kw'>not</span> <span class='id identifier rubyid_res'>res</span>
|
||||
<span class='id identifier rubyid_res'>res</span> <span class='op'>=</span> <span class='id identifier rubyid_extract_fmt_output'>extract_fmt_output</span><span class='lparen'>(</span><span class='id identifier rubyid_res'>res</span><span class='rparen'>)</span>
|
||||
<span class='kw'>if</span> <span class='id identifier rubyid_res'>res</span> <span class='op'>=~</span> <span class='tstring'><span class='regexp_beg'>/</span><span class='tstring_content'>^\|[\-0-9]+\.[0-9]+\|$</span><span class='regexp_end'>/</span></span>
|
||||
<span class='kw'>return</span> <span class='kw'>true</span>
|
||||
<span class='kw'>end</span>
|
||||
<span class='kw'>return</span> <span class='kw'>false</span>
|
||||
<span class='kw'>end</span></pre>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
</div>
|
||||
|
||||
<div class="method_details ">
|
||||
<h3 class="signature " id="fmtstr_detect_caps-instance_method">
|
||||
|
||||
#<strong>fmtstr_detect_caps</strong> ⇒ <tt>Object</tt>
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
</h3><div class="docstring">
|
||||
<div class="discussion">
|
||||
|
||||
<p>Detect the capabilities (only works for non-blind)</p>
|
||||
|
||||
|
||||
</div>
|
||||
</div>
|
||||
<div class="tags">
|
||||
|
||||
|
||||
</div><table class="source_code">
|
||||
<tr>
|
||||
<td>
|
||||
<pre class="lines">
|
||||
|
||||
|
||||
36
|
||||
37
|
||||
38
|
||||
39
|
||||
40</pre>
|
||||
</td>
|
||||
<td>
|
||||
<pre class="code"><span class="info file"># File 'lib/msf/core/exploit/format_string.rb', line 36</span>
|
||||
|
||||
<span class='kw'>def</span> <span class='id identifier rubyid_fmtstr_detect_caps'>fmtstr_detect_caps</span>
|
||||
<span class='ivar'>@use_dpa</span> <span class='op'>=</span> <span class='id identifier rubyid_fmtstr_detect_cap_dpa'>fmtstr_detect_cap_dpa</span>
|
||||
<span class='ivar'>@use_fpu</span> <span class='op'>=</span> <span class='id identifier rubyid_fmtstr_detect_cap_fpu'>fmtstr_detect_cap_fpu</span>
|
||||
<span class='comment'>#print_status("support dpa:#{@use_dpa.to_s}, fpu:#{@use_fpu.to_s}")
|
||||
</span><span class='kw'>end</span></pre>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
</div>
|
||||
|
||||
<div class="method_details ">
|
||||
<h3 class="signature " id="fmtstr_detect_exploitable-instance_method">
|
||||
|
||||
#<strong>fmtstr_detect_exploitable</strong> ⇒ <tt>Object</tt>
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
</h3><div class="docstring">
|
||||
<div class="discussion">
|
||||
|
||||
<p>NOTE: This will likely crash the target process</p>
|
||||
|
||||
|
||||
</div>
|
||||
</div>
|
||||
<div class="tags">
|
||||
|
||||
|
||||
</div><table class="source_code">
|
||||
<tr>
|
||||
<td>
|
||||
<pre class="lines">
|
||||
|
||||
|
||||
73
|
||||
74
|
||||
75
|
||||
76
|
||||
77
|
||||
78
|
||||
79
|
||||
80
|
||||
81
|
||||
82
|
||||
83
|
||||
84
|
||||
85</pre>
|
||||
</td>
|
||||
<td>
|
||||
<pre class="code"><span class="info file"># File 'lib/msf/core/exploit/format_string.rb', line 73</span>
|
||||
|
||||
<span class='kw'>def</span> <span class='id identifier rubyid_fmtstr_detect_exploitable'>fmtstr_detect_exploitable</span>
|
||||
<span class='kw'>begin</span>
|
||||
<span class='id identifier rubyid_res'>res</span> <span class='op'>=</span> <span class='id identifier rubyid_trigger_fmt'>trigger_fmt</span><span class='lparen'>(</span><span class='tstring'><span class='tstring_beg'>"</span><span class='tstring_content'>|</span><span class='tstring_end'>"</span></span> <span class='op'>+</span> <span class='lparen'>(</span><span class='tstring'><span class='tstring_beg'>"</span><span class='tstring_content'>%n</span><span class='tstring_end'>"</span></span> <span class='op'>*</span> <span class='int'>16</span><span class='rparen'>)</span> <span class='op'>+</span> <span class='tstring'><span class='tstring_beg'>"</span><span class='tstring_content'>|</span><span class='tstring_end'>"</span></span><span class='rparen'>)</span>
|
||||
<span class='kw'>rescue</span> <span class='op'>::</span><span class='const'>Exception</span>
|
||||
<span class='id identifier rubyid_res'>res</span> <span class='op'>=</span> <span class='kw'>nil</span>
|
||||
<span class='kw'>end</span>
|
||||
<span class='kw'>return</span> <span class='kw'>true</span> <span class='kw'>if</span> <span class='kw'>not</span> <span class='id identifier rubyid_res'>res</span>
|
||||
<span class='id identifier rubyid_res'>res</span> <span class='op'>=</span> <span class='id identifier rubyid_extract_fmt_output'>extract_fmt_output</span><span class='lparen'>(</span><span class='id identifier rubyid_res'>res</span><span class='rparen'>)</span>
|
||||
<span class='kw'>if</span> <span class='id identifier rubyid_res'>res</span> <span class='op'>=~</span> <span class='tstring'><span class='regexp_beg'>/</span><span class='tstring_content'>^\|\|$</span><span class='regexp_end'>/</span></span>
|
||||
<span class='kw'>return</span> <span class='kw'>true</span>
|
||||
<span class='kw'>end</span>
|
||||
<span class='kw'>return</span> <span class='kw'>false</span>
|
||||
<span class='kw'>end</span></pre>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
</div>
|
||||
|
||||
<div class="method_details ">
|
||||
<h3 class="signature " id="fmtstr_detect_vulnerable-instance_method">
|
||||
|
||||
#<strong>fmtstr_detect_vulnerable</strong> ⇒ <tt>Object</tt>
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
</h3><table class="source_code">
|
||||
<tr>
|
||||
<td>
|
||||
<pre class="lines">
|
||||
|
||||
|
||||
62
|
||||
63
|
||||
64
|
||||
65
|
||||
66
|
||||
67
|
||||
68
|
||||
69
|
||||
70</pre>
|
||||
</td>
|
||||
<td>
|
||||
<pre class="code"><span class="info file"># File 'lib/msf/core/exploit/format_string.rb', line 62</span>
|
||||
|
||||
<span class='kw'>def</span> <span class='id identifier rubyid_fmtstr_detect_vulnerable'>fmtstr_detect_vulnerable</span>
|
||||
<span class='id identifier rubyid_res'>res</span> <span class='op'>=</span> <span class='id identifier rubyid_trigger_fmt'>trigger_fmt</span><span class='lparen'>(</span><span class='tstring'><span class='tstring_beg'>"</span><span class='tstring_content'>|%08x|</span><span class='tstring_end'>"</span></span><span class='rparen'>)</span>
|
||||
<span class='kw'>return</span> <span class='kw'>false</span> <span class='kw'>if</span> <span class='kw'>not</span> <span class='id identifier rubyid_res'>res</span>
|
||||
<span class='id identifier rubyid_res'>res</span> <span class='op'>=</span> <span class='id identifier rubyid_extract_fmt_output'>extract_fmt_output</span><span class='lparen'>(</span><span class='id identifier rubyid_res'>res</span><span class='rparen'>)</span>
|
||||
<span class='kw'>if</span> <span class='id identifier rubyid_res'>res</span> <span class='op'>=~</span> <span class='tstring'><span class='regexp_beg'>/</span><span class='tstring_content'>^\|[0-9a-f]{8}\|$</span><span class='regexp_end'>/</span></span>
|
||||
<span class='kw'>return</span> <span class='kw'>true</span>
|
||||
<span class='kw'>end</span>
|
||||
<span class='kw'>return</span> <span class='kw'>false</span>
|
||||
<span class='kw'>end</span></pre>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
</div>
|
||||
|
||||
<div class="method_details ">
|
||||
<h3 class="signature " id="fmtstr_gen_array_from_buf-instance_method">
|
||||
|
||||
#<strong>fmtstr_gen_array_from_buf</strong>(write_to, buffer, targ = target) ⇒ <tt>Object</tt>
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
</h3><div class="docstring">
|
||||
<div class="discussion">
|
||||
|
||||
<p>Generates and returns an array of what/where pairs from the supplied buffer</p>
|
||||
|
||||
|
||||
</div>
|
||||
</div>
|
||||
<div class="tags">
|
||||
|
||||
|
||||
</div><table class="source_code">
|
||||
<tr>
|
||||
<td>
|
||||
<pre class="lines">
|
||||
|
||||
|
||||
118
|
||||
119
|
||||
120
|
||||
121
|
||||
122
|
||||
123
|
||||
124
|
||||
125
|
||||
126
|
||||
127
|
||||
128
|
||||
129
|
||||
130
|
||||
131
|
||||
132
|
||||
133
|
||||
134
|
||||
135
|
||||
136</pre>
|
||||
</td>
|
||||
<td>
|
||||
<pre class="code"><span class="info file"># File 'lib/msf/core/exploit/format_string.rb', line 118</span>
|
||||
|
||||
<span class='kw'>def</span> <span class='id identifier rubyid_fmtstr_gen_array_from_buf'>fmtstr_gen_array_from_buf</span><span class='lparen'>(</span><span class='id identifier rubyid_write_to'>write_to</span><span class='comma'>,</span> <span class='id identifier rubyid_buffer'>buffer</span><span class='comma'>,</span> <span class='id identifier rubyid_targ'>targ</span> <span class='op'>=</span> <span class='id identifier rubyid_target'>target</span><span class='rparen'>)</span>
|
||||
|
||||
<span class='comment'># break buffer into shorts
|
||||
</span> <span class='id identifier rubyid_arr'>arr</span> <span class='op'>=</span> <span class='const'>Array</span><span class='period'>.</span><span class='id identifier rubyid_new'>new</span>
|
||||
<span class='id identifier rubyid_off'>off</span> <span class='op'>=</span> <span class='int'>0</span>
|
||||
<span class='kw'>if</span> <span class='lparen'>(</span><span class='lparen'>(</span><span class='id identifier rubyid_buffer'>buffer</span><span class='period'>.</span><span class='id identifier rubyid_length'>length</span> <span class='op'>%</span> <span class='int'>2</span><span class='rparen'>)</span> <span class='op'>==</span> <span class='int'>1</span><span class='rparen'>)</span>
|
||||
<span class='id identifier rubyid_buffer'>buffer</span> <span class='op'><<</span> <span class='id identifier rubyid_rand_text'>rand_text</span><span class='lparen'>(</span><span class='int'>1</span><span class='rparen'>)</span>
|
||||
<span class='kw'>end</span>
|
||||
<span class='kw'>while</span> <span class='id identifier rubyid_off'>off</span> <span class='op'><</span> <span class='id identifier rubyid_buffer'>buffer</span><span class='period'>.</span><span class='id identifier rubyid_length'>length</span>
|
||||
<span class='comment'># convert short to number
|
||||
</span> <span class='id identifier rubyid_tb'>tb</span> <span class='op'>=</span> <span class='id identifier rubyid_buffer'>buffer</span><span class='lbracket'>[</span><span class='id identifier rubyid_off'>off</span><span class='comma'>,</span><span class='int'>2</span><span class='rbracket'>]</span><span class='period'>.</span><span class='id identifier rubyid_unpack'>unpack</span><span class='lparen'>(</span><span class='tstring'><span class='tstring_beg'>'</span><span class='tstring_content'>v</span><span class='tstring_end'>'</span></span><span class='rparen'>)</span><span class='lbracket'>[</span><span class='int'>0</span><span class='rbracket'>]</span><span class='period'>.</span><span class='id identifier rubyid_to_i'>to_i</span>
|
||||
<span class='comment'>#print_status("%d %d %d" % [off,buffer.length,tb])
|
||||
</span> <span class='id identifier rubyid_addr'>addr</span> <span class='op'>=</span> <span class='id identifier rubyid_write_to'>write_to</span> <span class='op'>+</span> <span class='id identifier rubyid_off'>off</span>
|
||||
|
||||
<span class='id identifier rubyid_arr'>arr</span> <span class='op'><<</span> <span class='lbracket'>[</span> <span class='id identifier rubyid_tb'>tb</span><span class='comma'>,</span> <span class='id identifier rubyid_addr'>addr</span> <span class='rbracket'>]</span>
|
||||
<span class='id identifier rubyid_off'>off</span> <span class='op'>+=</span> <span class='int'>2</span>
|
||||
<span class='kw'>end</span>
|
||||
<span class='kw'>return</span> <span class='id identifier rubyid_arr'>arr</span>
|
||||
<span class='kw'>end</span></pre>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
</div>
|
||||
|
||||
<div class="method_details ">
|
||||
<h3 class="signature " id="fmtstr_gen_from_array-instance_method">
|
||||
|
||||
#<strong>fmtstr_gen_from_array</strong>(num_printed, arr, targ = target) ⇒ <tt>Object</tt>
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
</h3><div class="docstring">
|
||||
<div class="discussion">
|
||||
|
||||
<p>Generates a format string from an array of value/address pairs</p>
|
||||
|
||||
|
||||
</div>
|
||||
</div>
|
||||
<div class="tags">
|
||||
|
||||
|
||||
</div><table class="source_code">
|
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|
||||
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|
||||
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|
||||
<pre class="code"><span class="info file"># File 'lib/msf/core/exploit/format_string.rb', line 141</span>
|
||||
|
||||
<span class='kw'>def</span> <span class='id identifier rubyid_fmtstr_gen_from_array'>fmtstr_gen_from_array</span><span class='lparen'>(</span><span class='id identifier rubyid_num_printed'>num_printed</span><span class='comma'>,</span> <span class='id identifier rubyid_arr'>arr</span><span class='comma'>,</span> <span class='id identifier rubyid_targ'>targ</span> <span class='op'>=</span> <span class='id identifier rubyid_target'>target</span><span class='rparen'>)</span>
|
||||
<span class='id identifier rubyid_num_pops'>num_pops</span> <span class='op'>=</span> <span class='id identifier rubyid_targ'>targ</span><span class='lbracket'>[</span><span class='tstring'><span class='tstring_beg'>'</span><span class='tstring_content'>NumPops</span><span class='tstring_end'>'</span></span><span class='rbracket'>]</span>
|
||||
<span class='id identifier rubyid_num_pad'>num_pad</span> <span class='op'>=</span> <span class='id identifier rubyid_targ'>targ</span><span class='lbracket'>[</span><span class='tstring'><span class='tstring_beg'>'</span><span class='tstring_content'>PadBytes</span><span class='tstring_end'>'</span></span><span class='rbracket'>]</span> <span class='op'>||</span> <span class='int'>0</span>
|
||||
|
||||
<span class='comment'># sort the array -- for optimization
|
||||
</span> <span class='id identifier rubyid_arr'>arr</span> <span class='op'>=</span> <span class='id identifier rubyid_arr'>arr</span><span class='period'>.</span><span class='id identifier rubyid_sort'>sort</span> <span class='lbrace'>{</span> <span class='op'>|</span><span class='id identifier rubyid_x'>x</span><span class='comma'>,</span><span class='id identifier rubyid_y'>y</span><span class='op'>|</span> <span class='id identifier rubyid_x'>x</span><span class='lbracket'>[</span><span class='int'>0</span><span class='rbracket'>]</span> <span class='op'><=></span> <span class='id identifier rubyid_y'>y</span><span class='lbracket'>[</span><span class='int'>0</span><span class='rbracket'>]</span> <span class='rbrace'>}</span>
|
||||
|
||||
<span class='comment'># build up the addrs and fmts buffers
|
||||
</span> <span class='id identifier rubyid_fmts'>fmts</span> <span class='op'>=</span> <span class='tstring'><span class='tstring_beg'>"</span><span class='tstring_end'>"</span></span>
|
||||
<span class='id identifier rubyid_addrs'>addrs</span> <span class='op'>=</span> <span class='tstring'><span class='tstring_beg'>"</span><span class='tstring_end'>"</span></span>
|
||||
<span class='id identifier rubyid_num'>num</span> <span class='op'>=</span> <span class='id identifier rubyid_fmtstr_count_printed'>fmtstr_count_printed</span><span class='lparen'>(</span><span class='id identifier rubyid_num_printed'>num_printed</span><span class='comma'>,</span> <span class='id identifier rubyid_num_pad'>num_pad</span><span class='comma'>,</span> <span class='id identifier rubyid_num_pops'>num_pops</span><span class='comma'>,</span> <span class='id identifier rubyid_arr'>arr</span><span class='rparen'>)</span>
|
||||
<span class='id identifier rubyid_arr'>arr</span><span class='period'>.</span><span class='id identifier rubyid_each'>each</span> <span class='kw'>do</span> <span class='op'>|</span><span class='id identifier rubyid_el'>el</span><span class='op'>|</span>
|
||||
<span class='comment'># find out how much to advance the column value
|
||||
</span> <span class='id identifier rubyid_prec'>prec</span> <span class='op'>=</span> <span class='id identifier rubyid_fmtstr_target_short'>fmtstr_target_short</span><span class='lparen'>(</span><span class='id identifier rubyid_el'>el</span><span class='lbracket'>[</span><span class='int'>0</span><span class='rbracket'>]</span><span class='comma'>,</span> <span class='id identifier rubyid_num'>num</span><span class='rparen'>)</span>
|
||||
|
||||
<span class='comment'># for non-dpa, if the prec is more than 8, we need something to pop
|
||||
</span> <span class='kw'>if</span> <span class='kw'>not</span> <span class='ivar'>@use_dpa</span> <span class='kw'>and</span> <span class='id identifier rubyid_prec'>prec</span> <span class='op'>>=</span> <span class='int'>8</span>
|
||||
<span class='id identifier rubyid_addrs'>addrs</span> <span class='op'><<</span> <span class='id identifier rubyid_rand_text'>rand_text</span><span class='lparen'>(</span><span class='int'>4</span><span class='rparen'>)</span>
|
||||
<span class='kw'>end</span>
|
||||
|
||||
<span class='comment'># write here!
|
||||
</span> <span class='id identifier rubyid_addrs'>addrs</span> <span class='op'><<</span> <span class='lbracket'>[</span><span class='id identifier rubyid_el'>el</span><span class='lbracket'>[</span><span class='int'>1</span><span class='rbracket'>]</span><span class='rbracket'>]</span><span class='period'>.</span><span class='id identifier rubyid_pack'>pack</span><span class='lparen'>(</span><span class='tstring'><span class='tstring_beg'>'</span><span class='tstring_content'>V</span><span class='tstring_end'>'</span></span><span class='rparen'>)</span>
|
||||
|
||||
<span class='comment'># put our advancement fmt (or bytes)
|
||||
</span> <span class='id identifier rubyid_fmts'>fmts</span> <span class='op'><<</span> <span class='id identifier rubyid_fmtstr_advance_count'>fmtstr_advance_count</span><span class='lparen'>(</span><span class='id identifier rubyid_prec'>prec</span><span class='rparen'>)</span>
|
||||
|
||||
<span class='comment'># fmt to cause the write :)
|
||||
</span> <span class='kw'>if</span> <span class='ivar'>@use_dpa</span>
|
||||
<span class='id identifier rubyid_fmts'>fmts</span> <span class='op'><<</span> <span class='tstring'><span class='tstring_beg'>"</span><span class='tstring_content'>%</span><span class='tstring_end'>"</span></span> <span class='op'>+</span> <span class='id identifier rubyid_num_pops'>num_pops</span><span class='period'>.</span><span class='id identifier rubyid_to_s'>to_s</span> <span class='op'>+</span> <span class='tstring'><span class='tstring_beg'>"</span><span class='tstring_content'>$hn</span><span class='tstring_end'>"</span></span>
|
||||
<span class='id identifier rubyid_num_pops'>num_pops</span> <span class='op'>+=</span> <span class='int'>1</span>
|
||||
<span class='kw'>else</span>
|
||||
<span class='id identifier rubyid_fmts'>fmts</span> <span class='op'><<</span> <span class='tstring'><span class='tstring_beg'>"</span><span class='tstring_content'>%hn</span><span class='tstring_end'>"</span></span>
|
||||
<span class='kw'>end</span>
|
||||
|
||||
<span class='comment'># update written count
|
||||
</span> <span class='id identifier rubyid_num'>num</span> <span class='op'>=</span> <span class='id identifier rubyid_el'>el</span><span class='lbracket'>[</span><span class='int'>0</span><span class='rbracket'>]</span>
|
||||
<span class='kw'>end</span>
|
||||
|
||||
<span class='comment'># make sure we dont have bad characters ...
|
||||
</span> <span class='kw'>if</span> <span class='lparen'>(</span><span class='id identifier rubyid_bad_idx'>bad_idx</span> <span class='op'>=</span> <span class='const'><span class='object_link'><a href="../../Rex.html" title="Rex (module)">Rex</a></span></span><span class='op'>::</span><span class='const'>Text</span><span class='period'>.</span><span class='id identifier rubyid_badchar_index'>badchar_index</span><span class='lparen'>(</span><span class='id identifier rubyid_addrs'>addrs</span><span class='comma'>,</span> <span class='id identifier rubyid_payload_badchars'>payload_badchars</span><span class='rparen'>)</span><span class='rparen'>)</span>
|
||||
<span class='id identifier rubyid_raise'>raise</span> <span class='const'><span class='object_link'><a href="../BadcharError.html" title="Msf::BadcharError (class)">BadcharError</a></span></span><span class='period'>.</span><span class='id identifier rubyid_new'><span class='object_link'><a href="../BadcharError.html#initialize-instance_method" title="Msf::BadcharError#initialize (method)">new</a></span></span><span class='lparen'>(</span><span class='id identifier rubyid_addrs'>addrs</span><span class='comma'>,</span> <span class='id identifier rubyid_bad_idx'>bad_idx</span><span class='comma'>,</span> <span class='id identifier rubyid_addrs'>addrs</span><span class='period'>.</span><span class='id identifier rubyid_length'>length</span><span class='comma'>,</span> <span class='id identifier rubyid_addrs'>addrs</span><span class='lbracket'>[</span><span class='id identifier rubyid_bad_idx'>bad_idx</span><span class='rbracket'>]</span><span class='rparen'>)</span><span class='comma'>,</span>
|
||||
<span class='tstring'><span class='tstring_beg'>"</span><span class='tstring_content'>The format string address area contains invalid characters.</span><span class='tstring_end'>"</span></span><span class='comma'>,</span>
|
||||
<span class='id identifier rubyid_caller'>caller</span>
|
||||
<span class='kw'>end</span>
|
||||
|
||||
<span class='comment'># put it all together
|
||||
</span> <span class='id identifier rubyid_stuff'>stuff</span> <span class='op'>=</span> <span class='id identifier rubyid_rand_text'>rand_text</span><span class='lparen'>(</span><span class='id identifier rubyid_num_pad'>num_pad</span><span class='rparen'>)</span>
|
||||
<span class='id identifier rubyid_stuff'>stuff</span> <span class='op'><<</span> <span class='id identifier rubyid_addrs'>addrs</span>
|
||||
<span class='kw'>if</span> <span class='kw'>not</span> <span class='ivar'>@use_dpa</span>
|
||||
<span class='id identifier rubyid_stuff'>stuff</span> <span class='op'><<</span> <span class='tstring'><span class='tstring_beg'>"</span><span class='tstring_content'>%8x</span><span class='tstring_end'>"</span></span> <span class='op'>*</span> <span class='id identifier rubyid_num_pops'>num_pops</span>
|
||||
<span class='kw'>end</span>
|
||||
<span class='id identifier rubyid_stuff'>stuff</span> <span class='op'><<</span> <span class='id identifier rubyid_fmts'>fmts</span>
|
||||
|
||||
<span class='kw'>return</span> <span class='id identifier rubyid_stuff'>stuff</span>
|
||||
<span class='kw'>end</span></pre>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
</div>
|
||||
|
||||
<div class="method_details ">
|
||||
<h3 class="signature " id="fmtstr_set_caps-instance_method">
|
||||
|
||||
#<strong>fmtstr_set_caps</strong>(fpu, dpa) ⇒ <tt>Object</tt>
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
</h3><div class="docstring">
|
||||
<div class="discussion">
|
||||
|
||||
<p>Allow caller to override the capabilities</p>
|
||||
|
||||
|
||||
</div>
|
||||
</div>
|
||||
<div class="tags">
|
||||
|
||||
|
||||
</div><table class="source_code">
|
||||
<tr>
|
||||
<td>
|
||||
<pre class="lines">
|
||||
|
||||
|
||||
28
|
||||
29
|
||||
30
|
||||
31</pre>
|
||||
</td>
|
||||
<td>
|
||||
<pre class="code"><span class="info file"># File 'lib/msf/core/exploit/format_string.rb', line 28</span>
|
||||
|
||||
<span class='kw'>def</span> <span class='id identifier rubyid_fmtstr_set_caps'>fmtstr_set_caps</span><span class='lparen'>(</span><span class='id identifier rubyid_fpu'>fpu</span><span class='comma'>,</span> <span class='id identifier rubyid_dpa'>dpa</span><span class='rparen'>)</span>
|
||||
<span class='ivar'>@use_fpu</span> <span class='op'>=</span> <span class='id identifier rubyid_fpu'>fpu</span>
|
||||
<span class='ivar'>@use_dpa</span> <span class='op'>=</span> <span class='id identifier rubyid_dpa'>dpa</span>
|
||||
<span class='kw'>end</span></pre>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
</div>
|
||||
|
||||
<div class="method_details ">
|
||||
<h3 class="signature " id="fmtstr_stack_read-instance_method">
|
||||
|
||||
#<strong>fmtstr_stack_read</strong>(offset, extra = '') ⇒ <tt>Object</tt>
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
</h3><div class="docstring">
|
||||
<div class="discussion">
|
||||
|
||||
<p>Read a single 32-bit integer from the stack at the specified offset</p>
|
||||
|
||||
|
||||
</div>
|
||||
</div>
|
||||
<div class="tags">
|
||||
|
||||
|
||||
</div><table class="source_code">
|
||||
<tr>
|
||||
<td>
|
||||
<pre class="lines">
|
||||
|
||||
|
||||
254
|
||||
255
|
||||
256
|
||||
257
|
||||
258
|
||||
259
|
||||
260
|
||||
261
|
||||
262
|
||||
263
|
||||
264
|
||||
265
|
||||
266
|
||||
267
|
||||
268
|
||||
269
|
||||
270
|
||||
271
|
||||
272
|
||||
273
|
||||
274
|
||||
275
|
||||
276
|
||||
277
|
||||
278
|
||||
279</pre>
|
||||
</td>
|
||||
<td>
|
||||
<pre class="code"><span class="info file"># File 'lib/msf/core/exploit/format_string.rb', line 254</span>
|
||||
|
||||
<span class='kw'>def</span> <span class='id identifier rubyid_fmtstr_stack_read'>fmtstr_stack_read</span><span class='lparen'>(</span><span class='id identifier rubyid_offset'>offset</span><span class='comma'>,</span> <span class='id identifier rubyid_extra'>extra</span> <span class='op'>=</span> <span class='tstring'><span class='tstring_beg'>'</span><span class='tstring_end'>'</span></span><span class='rparen'>)</span>
|
||||
|
||||
<span class='comment'># cant read offset 0!
|
||||
</span> <span class='kw'>return</span> <span class='kw'>nil</span> <span class='kw'>if</span> <span class='id identifier rubyid_offset'>offset</span> <span class='op'><</span> <span class='int'>1</span>
|
||||
|
||||
<span class='id identifier rubyid_fmt'>fmt</span> <span class='op'>=</span> <span class='tstring'><span class='tstring_beg'>'</span><span class='tstring_end'>'</span></span>
|
||||
<span class='id identifier rubyid_fmt'>fmt</span> <span class='op'><<</span> <span class='id identifier rubyid_extra'>extra</span>
|
||||
<span class='kw'>if</span> <span class='ivar'>@use_dpa</span>
|
||||
<span class='id identifier rubyid_fmt'>fmt</span> <span class='op'><<</span> <span class='tstring'><span class='tstring_beg'>"</span><span class='tstring_content'>|%</span><span class='tstring_end'>"</span></span> <span class='op'>+</span> <span class='id identifier rubyid_offset'>offset</span><span class='period'>.</span><span class='id identifier rubyid_to_s'>to_s</span> <span class='op'>+</span> <span class='tstring'><span class='tstring_beg'>"</span><span class='tstring_content'>$x</span><span class='tstring_end'>"</span></span>
|
||||
<span class='kw'>else</span>
|
||||
<span class='id identifier rubyid_x'>x</span> <span class='op'>=</span> <span class='id identifier rubyid_offset'>offset</span>
|
||||
<span class='kw'>if</span> <span class='ivar'>@use_fpu</span> <span class='kw'>and</span> <span class='id identifier rubyid_x'>x</span> <span class='op'>>=</span> <span class='int'>2</span>
|
||||
<span class='id identifier rubyid_fmt'>fmt</span> <span class='op'><<</span> <span class='tstring'><span class='tstring_beg'>"</span><span class='tstring_content'>%g</span><span class='tstring_end'>"</span></span> <span class='op'>*</span> <span class='lparen'>(</span><span class='id identifier rubyid_x'>x</span><span class='op'>/</span><span class='int'>2</span><span class='rparen'>)</span>
|
||||
<span class='id identifier rubyid_x'>x</span> <span class='op'>%=</span> <span class='int'>2</span><span class='semicolon'>;</span>
|
||||
<span class='kw'>end</span>
|
||||
<span class='id identifier rubyid_fmt'>fmt</span> <span class='op'><<</span> <span class='tstring'><span class='tstring_beg'>"</span><span class='tstring_content'>%x</span><span class='tstring_end'>"</span></span> <span class='op'>*</span> <span class='lparen'>(</span><span class='id identifier rubyid_x'>x</span><span class='op'>-</span><span class='int'>1</span><span class='rparen'>)</span>
|
||||
<span class='id identifier rubyid_fmt'>fmt</span> <span class='op'><<</span> <span class='tstring'><span class='tstring_beg'>"</span><span class='tstring_content'>|</span><span class='tstring_end'>"</span></span>
|
||||
<span class='id identifier rubyid_fmt'>fmt</span> <span class='op'><<</span> <span class='tstring'><span class='tstring_beg'>"</span><span class='tstring_content'>%x</span><span class='tstring_end'>"</span></span>
|
||||
<span class='kw'>end</span>
|
||||
|
||||
<span class='id identifier rubyid_res'>res</span> <span class='op'>=</span> <span class='id identifier rubyid_trigger_fmt'>trigger_fmt</span><span class='lparen'>(</span><span class='id identifier rubyid_fmt'>fmt</span><span class='rparen'>)</span>
|
||||
<span class='kw'>return</span> <span class='id identifier rubyid_res'>res</span> <span class='kw'>if</span> <span class='kw'>not</span> <span class='id identifier rubyid_res'>res</span>
|
||||
|
||||
<span class='id identifier rubyid_numstr'>numstr</span> <span class='op'>=</span> <span class='id identifier rubyid_extract_fmt_output'>extract_fmt_output</span><span class='lparen'>(</span><span class='id identifier rubyid_res'>res</span><span class='rparen'>)</span>
|
||||
<span class='id identifier rubyid_dw'>dw</span> <span class='op'>=</span> <span class='id identifier rubyid_numstr'>numstr</span><span class='period'>.</span><span class='id identifier rubyid_split'>split</span><span class='lparen'>(</span><span class='tstring'><span class='tstring_beg'>'</span><span class='tstring_content'>|</span><span class='tstring_end'>'</span></span><span class='rparen'>)</span><span class='lbracket'>[</span><span class='int'>1</span><span class='rbracket'>]</span><span class='period'>.</span><span class='id identifier rubyid_to_i'>to_i</span><span class='lparen'>(</span><span class='int'>16</span><span class='rparen'>)</span>
|
||||
<span class='kw'>end</span></pre>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
</div>
|
||||
|
||||
<div class="method_details ">
|
||||
<h3 class="signature " id="fmtstr_target_short-instance_method">
|
||||
|
||||
#<strong>fmtstr_target_short</strong>(value, num_printed) ⇒ <tt>Object</tt>
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
</h3><div class="docstring">
|
||||
<div class="discussion">
|
||||
|
||||
<p>Generate the number to be used for precision that will create the specified value to write</p>
|
||||
|
||||
|
||||
</div>
|
||||
</div>
|
||||
<div class="tags">
|
||||
|
||||
|
||||
</div><table class="source_code">
|
||||
<tr>
|
||||
<td>
|
||||
<pre class="lines">
|
||||
|
||||
|
||||
226
|
||||
227
|
||||
228
|
||||
229
|
||||
230
|
||||
231</pre>
|
||||
</td>
|
||||
<td>
|
||||
<pre class="code"><span class="info file"># File 'lib/msf/core/exploit/format_string.rb', line 226</span>
|
||||
|
||||
<span class='kw'>def</span> <span class='id identifier rubyid_fmtstr_target_short'>fmtstr_target_short</span><span class='lparen'>(</span><span class='id identifier rubyid_value'>value</span><span class='comma'>,</span> <span class='id identifier rubyid_num_printed'>num_printed</span><span class='rparen'>)</span>
|
||||
<span class='kw'>if</span> <span class='id identifier rubyid_value'>value</span> <span class='op'><</span> <span class='id identifier rubyid_num_printed'>num_printed</span>
|
||||
<span class='kw'>return</span> <span class='lparen'>(</span><span class='int'>0x10000</span> <span class='op'>-</span> <span class='id identifier rubyid_num_printed'>num_printed</span><span class='rparen'>)</span> <span class='op'>+</span> <span class='id identifier rubyid_value'>value</span>
|
||||
<span class='kw'>end</span>
|
||||
<span class='kw'>return</span> <span class='id identifier rubyid_value'>value</span> <span class='op'>-</span> <span class='id identifier rubyid_num_printed'>num_printed</span>
|
||||
<span class='kw'>end</span></pre>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
</div>
|
||||
|
||||
<div class="method_details ">
|
||||
<h3 class="signature " id="generate_fmt_two_shorts-instance_method">
|
||||
|
||||
#<strong>generate_fmt_two_shorts</strong>(num_printed, write_to, write_what, targ = target) ⇒ <tt>Object</tt>
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
</h3><div class="docstring">
|
||||
<div class="discussion">
|
||||
|
||||
<p>Generates a format string that will perform an arbitrary write using two separate short values</p>
|
||||
|
||||
|
||||
</div>
|
||||
</div>
|
||||
<div class="tags">
|
||||
|
||||
|
||||
</div><table class="source_code">
|
||||
<tr>
|
||||
<td>
|
||||
<pre class="lines">
|
||||
|
||||
|
||||
92
|
||||
93
|
||||
94
|
||||
95
|
||||
96
|
||||
97
|
||||
98
|
||||
99</pre>
|
||||
</td>
|
||||
<td>
|
||||
<pre class="code"><span class="info file"># File 'lib/msf/core/exploit/format_string.rb', line 92</span>
|
||||
|
||||
<span class='kw'>def</span> <span class='id identifier rubyid_generate_fmt_two_shorts'>generate_fmt_two_shorts</span><span class='lparen'>(</span><span class='id identifier rubyid_num_printed'>num_printed</span><span class='comma'>,</span> <span class='id identifier rubyid_write_to'>write_to</span><span class='comma'>,</span> <span class='id identifier rubyid_write_what'>write_what</span><span class='comma'>,</span> <span class='id identifier rubyid_targ'>targ</span> <span class='op'>=</span> <span class='id identifier rubyid_target'>target</span><span class='rparen'>)</span>
|
||||
|
||||
<span class='id identifier rubyid_arr'>arr</span> <span class='op'>=</span> <span class='const'>Array</span><span class='period'>.</span><span class='id identifier rubyid_new'>new</span>
|
||||
<span class='id identifier rubyid_arr'>arr</span> <span class='op'><<</span> <span class='lbracket'>[</span> <span class='id identifier rubyid_write_what'>write_what</span> <span class='op'>&</span> <span class='int'>0xffff</span><span class='comma'>,</span> <span class='id identifier rubyid_write_to'>write_to</span> <span class='rbracket'>]</span>
|
||||
<span class='id identifier rubyid_arr'>arr</span> <span class='op'><<</span> <span class='lbracket'>[</span> <span class='id identifier rubyid_write_what'>write_what</span> <span class='op'>>></span> <span class='int'>16</span><span class='comma'>,</span> <span class='id identifier rubyid_write_to'>write_to</span> <span class='op'>+</span> <span class='int'>2</span> <span class='rbracket'>]</span>
|
||||
|
||||
<span class='id identifier rubyid_stuff'>stuff</span> <span class='op'>=</span> <span class='id identifier rubyid_fmtstr_gen_from_array'>fmtstr_gen_from_array</span><span class='lparen'>(</span><span class='id identifier rubyid_num_printed'>num_printed</span><span class='comma'>,</span> <span class='id identifier rubyid_arr'>arr</span><span class='comma'>,</span> <span class='id identifier rubyid_targ'>targ</span><span class='rparen'>)</span>
|
||||
<span class='kw'>end</span></pre>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
</div>
|
||||
|
||||
<div class="method_details ">
|
||||
<h3 class="signature " id="generate_fmtstr_from_buf-instance_method">
|
||||
|
||||
#<strong>generate_fmtstr_from_buf</strong>(num_printed, write_to, buffer, targ = target) ⇒ <tt>Object</tt>
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
</h3><div class="docstring">
|
||||
<div class="discussion">
|
||||
|
||||
<p>Generates a format string that will perform an arbitrary write using two separate short values</p>
|
||||
|
||||
|
||||
</div>
|
||||
</div>
|
||||
<div class="tags">
|
||||
|
||||
|
||||
</div><table class="source_code">
|
||||
<tr>
|
||||
<td>
|
||||
<pre class="lines">
|
||||
|
||||
|
||||
105
|
||||
106
|
||||
107
|
||||
108
|
||||
109
|
||||
110
|
||||
111
|
||||
112</pre>
|
||||
</td>
|
||||
<td>
|
||||
<pre class="code"><span class="info file"># File 'lib/msf/core/exploit/format_string.rb', line 105</span>
|
||||
|
||||
<span class='kw'>def</span> <span class='id identifier rubyid_generate_fmtstr_from_buf'>generate_fmtstr_from_buf</span><span class='lparen'>(</span><span class='id identifier rubyid_num_printed'>num_printed</span><span class='comma'>,</span> <span class='id identifier rubyid_write_to'>write_to</span><span class='comma'>,</span> <span class='id identifier rubyid_buffer'>buffer</span><span class='comma'>,</span> <span class='id identifier rubyid_targ'>targ</span> <span class='op'>=</span> <span class='id identifier rubyid_target'>target</span><span class='rparen'>)</span>
|
||||
|
||||
<span class='comment'># break buffer into shorts
|
||||
</span> <span class='id identifier rubyid_arr'>arr</span> <span class='op'>=</span> <span class='id identifier rubyid_fmtstr_gen_array_from_buf'>fmtstr_gen_array_from_buf</span><span class='lparen'>(</span><span class='id identifier rubyid_write_to'>write_to</span><span class='comma'>,</span> <span class='id identifier rubyid_buffer'>buffer</span><span class='comma'>,</span> <span class='id identifier rubyid_targ'>targ</span><span class='rparen'>)</span>
|
||||
|
||||
<span class='comment'># now build the format string in its entirety
|
||||
</span> <span class='id identifier rubyid_stuff'>stuff</span> <span class='op'>=</span> <span class='id identifier rubyid_fmtstr_gen_from_array'>fmtstr_gen_from_array</span><span class='lparen'>(</span><span class='id identifier rubyid_num_printed'>num_printed</span><span class='comma'>,</span> <span class='id identifier rubyid_arr'>arr</span><span class='comma'>,</span> <span class='id identifier rubyid_targ'>targ</span><span class='rparen'>)</span>
|
||||
<span class='kw'>end</span></pre>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
</div>
|
||||
|
||||
<div class="method_details ">
|
||||
<h3 class="signature " id="initialize-instance_method">
|
||||
|
||||
#<strong>initialize</strong>(info = {}) ⇒ <tt>Object</tt>
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
</h3><div class="docstring">
|
||||
<div class="discussion">
|
||||
|
||||
<p>Creates an instance of a format string exploit</p>
|
||||
|
||||
|
||||
</div>
|
||||
</div>
|
||||
<div class="tags">
|
||||
|
||||
|
||||
</div><table class="source_code">
|
||||
<tr>
|
||||
<td>
|
||||
<pre class="lines">
|
||||
|
||||
|
||||
17
|
||||
18
|
||||
19
|
||||
20
|
||||
21
|
||||
22</pre>
|
||||
</td>
|
||||
<td>
|
||||
<pre class="code"><span class="info file"># File 'lib/msf/core/exploit/format_string.rb', line 17</span>
|
||||
|
||||
<span class='kw'>def</span> <span class='id identifier rubyid_initialize'>initialize</span><span class='lparen'>(</span><span class='id identifier rubyid_info'>info</span> <span class='op'>=</span> <span class='lbrace'>{</span><span class='rbrace'>}</span><span class='rparen'>)</span>
|
||||
<span class='kw'>super</span>
|
||||
|
||||
<span class='ivar'>@use_fpu</span> <span class='op'>=</span> <span class='kw'>false</span>
|
||||
<span class='ivar'>@use_dpa</span> <span class='op'>=</span> <span class='kw'>false</span>
|
||||
<span class='kw'>end</span></pre>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
</div>
|
||||
|
||||
</div>
|
||||
|
||||
</div>
|
||||
|
||||
<div id="footer">
|
||||
Generated on Fri May 8 17:01:38 2026 by
|
||||
<a href="https://yardoc.org" title="Yay! A Ruby Documentation Tool" target="_parent">yard</a>
|
||||
0.9.37 (ruby-3.1.5).
|
||||
</div>
|
||||
|
||||
</div>
|
||||
</body>
|
||||
</html>
|
||||
Reference in New Issue
Block a user