bugtraq - Av issues

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Date: 12 Mar 2005 09:40:24 -0000
From: Bipin Gautam <visitbipin@...mail.com>
To: bugtraq@...urityfocus.com
Subject: Av issues

In-Reply-To: <20050311203150.17236.qmail@....securityfocus.com>

In Local file header if you modify "general purpose bit flag" 7th & 8'th byte of a zip archive with \x2f ie: "\" F-port, Kaspersky, Mcafee, Norman, Sybari, Symantec seem to skip the file marking it as clean!!! This was discovered during the analysis of "Multiple AV Vendor Incorrect CRC32 Bypass Vulnerability."
Quick/rough conclusion were drawn using www.virustotal.com

poc: http://www.geocities.com/visitbipin/gpbf.zip

Well, tested with F-prot, DrWeb, *Symantec 8.0 long ago... lately verified it using virustotal.com If you have a long archive coment... in a zip archive these AV can't detect virus embedded in it. I came to know Symantec 8.1 is immune to the bug?

POC: http://www.geocities.com/visitbipin/long_coment.zip

regards,
bipin gautam