[Code-Crunchers] [Full-disclosure] windows vulnerability? [was:Re: 137 bytes]

[Carlos Pizano]

It is true that the most phases of the loader are executed in usermode;
in fact in the context of the just-born process. However csrss.exe reads
parts of the PE (for example the manifest) and at that point a weird PE
can cause the crash of csrss and that will eventually crash the machine.

See for example:
http://support.microsoft.com/kb/921337


CPU

Ps <!first post!>

-----Original Message-----
From: Peter Ferrie [mailto:pferrie at symantec.com] 
Sent: Wednesday, November 08, 2006 10:16 AM
To: full-disclosure at lists.grok.org.uk
Cc: code-crunchers at whitestar.linuxbox.org
Subject: Re: [Code-Crunchers] [Full-disclosure] windows vulnerability?
[was:Re: 137 bytes]

> Using the PE as a vector to attack the PE loader with
> (potential!) code execution for privilage esclation.
> Using the PE itself as a vector of attack.

I made a malformed PE file that caused a BSOD in all Windows
versions, including XP SP1.  99 bytes. :-)
I don't know if it was exploitable, and Microsoft said "it's
not a vulnerability", but then they silently fixed it.
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