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Class: Net::SSH::Authentication::Methods::MalformedPacket
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<div id="content"><h1>Class: Net::SSH::Authentication::Methods::MalformedPacket
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<dt>Inherits:</dt>
<dd>
<span class="inheritName">Abstract</span>
<ul class="fullTree">
<li>Object</li>
<li class="next">Abstract</li>
<li class="next">Net::SSH::Authentication::Methods::MalformedPacket</li>
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<dt>Defined in:</dt>
<dd>lib/msf/core/exploit/remote/ssh/auth_methods/malformed_packet.rb</dd>
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<h2>Overview</h2><div class="docstring">
<div class="discussion">
<p><a href="https://tools.ietf.org/rfc/rfc4252.txt">tools.ietf.org/rfc/rfc4252.txt</a> <a href="https://tools.ietf.org/rfc/rfc4253.txt">tools.ietf.org/rfc/rfc4253.txt</a></p>
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<h2>
Instance Method Summary
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<ul class="summary">
<li class="public ">
<span class="summary_signature">
<a href="#authenticate-instance_method" title="#authenticate (instance method)">#<strong>authenticate</strong>(service_name, username, password = nil) &#x21d2; Object </a>
</span>
<span class="summary_desc"><div class='inline'></div></span>
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<h2>Instance Method Details</h2>
<div class="method_details first">
<h3 class="signature first" id="authenticate-instance_method">
#<strong>authenticate</strong>(service_name, username, password = nil) &#x21d2; <tt>Object</tt>
</h3><table class="source_code">
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<pre class="code"><span class="info file"># File 'lib/msf/core/exploit/remote/ssh/auth_methods/malformed_packet.rb', line 12</span>
<span class='kw'>def</span> <span class='id identifier rubyid_authenticate'>authenticate</span><span class='lparen'>(</span><span class='id identifier rubyid_service_name'>service_name</span><span class='comma'>,</span> <span class='id identifier rubyid_username'>username</span><span class='comma'>,</span> <span class='id identifier rubyid_password'>password</span> <span class='op'>=</span> <span class='kw'>nil</span><span class='rparen'>)</span>
<span class='id identifier rubyid_debug'>debug</span> <span class='lbrace'>{</span> <span class='tstring'><span class='tstring_beg'>&#39;</span><span class='tstring_content'>Sending SSH_MSG_USERAUTH_REQUEST (publickey)</span><span class='tstring_end'>&#39;</span></span> <span class='rbrace'>}</span>
<span class='comment'># Corrupt everything after auth method
</span> <span class='id identifier rubyid_send_message'>send_message</span><span class='lparen'>(</span><span class='id identifier rubyid_userauth_request'>userauth_request</span><span class='lparen'>(</span>
<span class='embdoc_beg'>=begin
</span><span class='embdoc'> string user name in ISO-10646 UTF-8 encoding [RFC3629]
</span><span class='embdoc'> string service name in US-ASCII
</span><span class='embdoc'> string &quot;publickey&quot;
</span><span class='embdoc'> boolean FALSE
</span><span class='embdoc'> string public key algorithm name
</span><span class='embdoc'> string public key blob
</span><span class='embdoc_end'>=end
</span> <span class='id identifier rubyid_username'>username</span><span class='comma'>,</span>
<span class='id identifier rubyid_service_name'>service_name</span><span class='comma'>,</span>
<span class='tstring'><span class='tstring_beg'>&#39;</span><span class='tstring_content'>publickey</span><span class='tstring_end'>&#39;</span></span><span class='comma'>,</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_rand_text_english'>rand_text_english</span><span class='lparen'>(</span><span class='int'>8</span><span class='op'>..</span><span class='int'>42</span><span class='rparen'>)</span>
<span class='rparen'>)</span><span class='rparen'>)</span>
<span class='comment'># SSH_MSG_DISCONNECT is queued
</span> <span class='kw'>begin</span>
<span class='id identifier rubyid_message'>message</span> <span class='op'>=</span> <span class='id identifier rubyid_session'>session</span><span class='period'>.</span><span class='id identifier rubyid_next_message'>next_message</span>
<span class='kw'>rescue</span> <span class='const'>Net</span><span class='op'>::</span><span class='const'>SSH</span><span class='op'>::</span><span class='const'>Disconnect</span>
<span class='id identifier rubyid_debug'>debug</span> <span class='lbrace'>{</span> <span class='tstring'><span class='tstring_beg'>&#39;</span><span class='tstring_content'>Received SSH_MSG_DISCONNECT</span><span class='tstring_end'>&#39;</span></span> <span class='rbrace'>}</span>
<span class='kw'>return</span> <span class='kw'>true</span>
<span class='kw'>end</span>
<span class='kw'>if</span> <span class='id identifier rubyid_message'>message</span> <span class='op'>&amp;&amp;</span> <span class='id identifier rubyid_message'>message</span><span class='period'>.</span><span class='id identifier rubyid_type'>type</span> <span class='op'>==</span> <span class='const'>USERAUTH_FAILURE</span>
<span class='id identifier rubyid_debug'>debug</span> <span class='lbrace'>{</span> <span class='tstring'><span class='tstring_beg'>&#39;</span><span class='tstring_content'>Received SSH_MSG_USERAUTH_FAILURE</span><span class='tstring_end'>&#39;</span></span> <span class='rbrace'>}</span>
<span class='kw'>return</span> <span class='kw'>false</span>
<span class='kw'>end</span>
<span class='comment'># We&#39;ll probably never hit this
</span> <span class='kw'>false</span>
<span class='kw'>end</span></pre>
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Generated on Fri May 8 17:03:49 2026 by
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0.9.37 (ruby-3.1.5).
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