full-disclosure - another filename bypass vulnerability

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Message-ID: <BAY19-DAV7AF82E723ED1BB91D31A2D95F0@phx.gbl>
Date: Thu Nov 17 20:37:59 2005
From: se_cur_ity at hotmail.com (Morning Wood)
Subject: another filename bypass vulnerability -
	fromcmd.exe

I think the OP was getting at this being an AV bypass vector for worms and
other malware that can interact with cmd.exe .
Theroy being that AV will scan by extention ( malware.exe vs malware.ext )
and thus evade detection but yet be executeable.
In light, informal testing this appears to be a realistic scenario that
provides yet another vector for AV bypass. On test systems,
"c:\>malware.exe.txt" runs the malware.exe, and does not open notepad. (
cmd.exe parses the file header, explorer.exe uses .extention )
my2bits,
MW