full-disclosure - Multiple AV Vendor Incorrect CRC32 Bypass Vulnerability.

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Message-ID: <42302167.8060708@xmcopartners.com>
From: fcharpen at xmcopartners.com (Frederic Charpentier)
Subject: Multiple AV Vendor Incorrect CRC32
	Bypass	Vulnerability.

Hi, I saw this behaviour last week with the virus "MyDoom.BE".
I use the mail gateway with Clamav/Amavis. Clamav doesn't detect the 
virus embeded in the zip file (with a crc broken).
But, Trendmicro detects it.

Fred.

bipin gautam wrote:
> Multiple AV Vendor Incorrect CRC32 Bypass
> Vulnerability.
> 
> Affected Product:
> AVG 718
> Sybari (Antigen for M$ exchange) 7.5.1314
> Symantec 8.0
> McAfee 4442
> BitDefender 7.0
> 
> 
> Description:
> if you create a zip archive with invalid CRC
> checksum...... some AV skip scanning the archive
> marking it as clean........ by this way, you can
> bypass antivirus gateways and slip in any attachment
> without scanning the archive. Moreover, these days....
> software tools automatically repair a *broken*
> archive.
> 
> Vendor notification: I've lost faith in responsible
> disclosure... long ago! Moreover, vendors don't
> respond in timely manner.
> 
> regards,
> Bipin Gautam
> http://www.geocities.com/visitbipin/
> 
> 
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-- 
_______________________________________
Frederic Charpentier - Xmco Partners
Security Consulting / Pentest
web  : http://www.xmcopartners.com