full-disclosure - another filename bypass vulnerability

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Date: Thu Nov 17 20:44:31 2005
From: Thierry at Zoller.lu (Thierry Zoller)
Subject: another filename bypass vulnerability -
	fromcmd.exe

Dear Morning Wood,

As shown by the recent MZ header bypass, (most) AV "analyse" the header
to determine the Filetpye. I think extension based recognition is to be
considered outdated.

MW> I think the OP was getting at this being an AV bypass vector for worms and
MW> other malware that can interact with cmd.exe .
Hmm ok, but how can it interact when it doesn't execute using explorer.exe ? Is
the user going under Dos to execute it? How does that fit in the
scenario ?

-- 
http://secdev.zoller.lu
Thierry Zoller