Full Disclosure mailing list archives
Re: Multiple AV Vendor Incorrect CRC32 Bypass Vulnerability.
From: Frederic Charpentier <fcharpen () xmcopartners com>
Date: Thu, 10 Mar 2005 02:28:55 -0800
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/ Disclaimer: The information in the advisory is believed to be accurate at the time of printing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect or consequential loss or damage arising from use of, or reliance on this information. __________________________________________________ Do You Yahoo!?Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com _______________________________________________Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://www.secunia.com/
-- _______________________________________ Frederic Charpentier - Xmco Partners Security Consulting / Pentest web : http://www.xmcopartners.com _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://www.secunia.com/
Current thread:
- Multiple AV Vendor Incorrect CRC32 Bypass Vulnerability. bipin gautam (Mar 09)
- Re: Multiple AV Vendor Incorrect CRC32 Bypass Vulnerability. Frederic Charpentier (Mar 10)
- Re: Multiple AV Vendor Incorrect CRC32 Bypass Vulnerability. Dr. Peter Bieringer (Mar 10)
- <Possible follow-ups>
- Re: Multiple AV Vendor Incorrect CRC32 Bypass Vulnerability. bipin gautam (Mar 10)
- RE: Multiple AV Vendor Incorrect CRC32 BypassVulnerability. Randall M (Mar 10)
- Re: Multiple AV Vendor Incorrect CRC32 Bypass Vulnerability. bipin gautam (Mar 10)
- Re: Multiple AV Vendor Incorrect CRC32 Bypass Vulnerability. Lise Moorveld (Mar 11)
- Re: Multiple AV Vendor Incorrect CRC32 Bypass Vulnerability. bipin gautam (Mar 11)