Bugtraq mailing list archives
Multiple Vendor Unusual MIME Encoding Content Filter Bypass
From: Hendrik Weimer <hendrik () enyo de>
Date: Wed, 06 Dec 2006 15:24:25 +0100
Several e-mail virus scanners can be tricked into passing an EICAR test file if the following conditions are met: 1. the EICAR file is encoded in Base64 including characters not in the standard alphabet (e.g. whitespaces) and 2. the part containing the EICAR file is nested within one or several levels of multipart/mixed content. Details and PoC can be found at: http://www.quantenblog.net/security/virus-scanner-bypass Vulnerable products: - BitDefender Mail Protection for SMB 2.0 - ClamAV 0.88.6 - F-Prot Antivirus for Linux x86 Mail Servers 4.6.6 - Kaspersky Anti-Virus for Linux Mail Server 5.5.10 Not recognizing the EICAR file, but aborting the scan: - F-Secure Anti-Virus for Linux Gateways 4.65 Not vulnerable: - avast! for Linux/Unix Servers 2.0.0
Current thread:
- Multiple Vendor Unusual MIME Encoding Content Filter Bypass Hendrik Weimer (Dec 06)
- Re: Multiple Vendor Unusual MIME Encoding Content Filter Bypass Tomasz Kojm (Dec 07)
- Re: Multiple Vendor Unusual MIME Encoding Content Filter Bypass Luke Borg (Dec 07)
- Re: Multiple Vendor Unusual MIME Encoding Content Filter Bypass michele.sandrelli () katamail com (Dec 07)
- Re[2]: Multiple Vendor Unusual MIME Encoding Content Filter Bypass 3APA3A (Dec 07)
- Re: Multiple Vendor Unusual MIME Encoding Content Filter Bypass Tomasz Kojm (Dec 07)
- Re: Multiple Vendor Unusual MIME Encoding Content Filter Bypass Gadi Evron (Dec 07)
- Re: Multiple Vendor Unusual MIME Encoding Content Filter Bypass Tomasz Kojm (Dec 07)