This is patch to change AllowWin32SEH to false.
Root cause:
The truely intended behavior is that if the user doesn't set a
BufferRegister and the encoder is for Windows, the AllowWin32SEH
code should kick in.
The problem here is that msfencode and msfvenom handle the platform
information differently, so we get different results.
With msfencode, the platform information isn't passed when alpha_mixed
is used, so even if you're using the encoder for Win32, the encoder
doesn't actually know about this. But everything works out just fine
anyway because people don't actually rely on AllowWin32SEH.
With msfvenom, the platform information is passed, so the encoder
actually knows it's for Windows. The two conditions are met (regster
and platform), so AllowWin32SEH kicks in. However, the AllowWin32SEH
technique enforces the BufferRegister to ECX, and that there's no
GetPC, so by default this isn't going to work.
The solution:
We are actually better off with setting AllowWin32SEH to false, mainly
because the SEH technique is pretty much dead (congrats MSFT!). And we
want the GetPC routine by default.
If people want to use AllowWin32SEH routine, they can simply set
AllowWin32SEH to true to bring it right back. For example:
e = framework.encoders.create('x86/alpha_mixed')
e.datastore.import_options_from_hash({'AllowWin32SEH'=>true})
buf = e.encode("AAAA", nil, nil, ::Msf::Module::PlatformList.win32)
Or in msfvenom:
msfvenom -p windows/meterpreter/bind_tcp -e x86/alpha_mixed
AllowWin32SEH=true -f raw
Fix#4717
See the complaint on #4039. This doesn't fix that particular
issue (it's somewhat unrelated), but does solve around
a file parsing problem reported by @void-in
1) Figure out how to handle unicode geteip (unicode encoded, alphanum probably)
2) Add keys to the unicode payloads to force a corresponding keyu on the exploit side to enable
git-svn-id: file:///home/svn/framework3/trunk@3863 4d416f70-5f16-0410-b530-b9f4589650da
Christian Mehlmauer
Brent Cook
jvazquez-r7
HD Moore
sinn3r
URI Assassin
Tod Beardsley
sinn3r
James Lee
kris
Ramon de C Valle
Matt Miller