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>> Sophos Anti-Virus Products Code Execution and Denial of Service Vulnerabilities
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Multiple vulnerabilities have been identified in various Sophos Anti-Virus products, which could be exploited by attackers or malware to take complete control of an affected system or cause a denial of service.
The first issue is due to an error in the virus engine that fails to properly handle Petite archives containing a large number of large sectors, which could be exploited by attackers to crash an affected application or exhaust all available resources, creating a denial of service condition.
The second flaw is due to an infinite loop error when processing specially crafted RAR archives, which could be exploited to exhaust all available resources, creating a denial of service condition.
The third vulnerability is due to a heap overflow error when handling malformed CHM files, which could be exploited by attackers to execute arbitrary commands and compromise a vulnerable system (e.g. by sending an e-mail containing a malicious file to a machine being protected by an application).
The fourth issue is due to a memory corruption error when handling CHM files with a specially crafted chunk header, which could be exploited by attackers to cause a denial of service or compromise a vulnerable system.
Affected Products
Sophos Anti-Virus + Application Control for Windows 2000/XP/2003 versions 6.x
Sophos Anti-Virus for Windows 2000/XP/2003 versions 6.x
Sophos Endpoint Security + Application Control 2000/XP/2003 versions 6.x
Sophos Endpoint Security versions 6.x
Sophos Anti-Virus for Linux (on-access) versions 5.x
Sophos Anti-Virus for AIX (PowerPC) versions 4.x
Sophos Anti-Virus for FreeBSD 6+ versions 4.x
Sophos Anti-Virus for FreeBSD 5.2+ versions 4.x
Sophos Anti-Virus for FreeBSD 3+ versions 4.x
Sophos Anti-Virus for FreeBSD 4.5+ versions 4.x
Sophos Anti-Virus for HP-UX (AMD64, glibc 2.3) versions 4.x
Sophos Anti-Virus for HP-UX (Itanium) versions 4.x
Sophos Anti-Virus for Linux (AMD64, glibc 2.3) versions 4.x
Sophos Anti-Virus for Linux (Intel, libc6) versions 4.x
Sophos Anti-Virus for Linux (Intel, libc6-glibc2.2) versions 4.x
Sophos Anti-Virus for Solaris (SPARC) versions 4.x
Sophos Anti-Virus for Solaris (Intel) versions 4.x
Sophos Anti-Virus for Tru64 UNIX (Alpha) versions 4.x
Sophos Anti-Virus for Windows 95/98/Me versions 4.x
Sophos Anti-Virus for Windows NT/2000/XP versions 4.x
Sophos Anti-Virus for NetWare versions 4.x
Sophos Anti-Virus for Windows NT versions 4.x
Sophos Anti-Virus for Macintosh versions 4.x
Sophos Anti-Virus for OS X versions 4.x
Solution
Apply fixes :
http://www.sophos.com/support/updates
References
http://www.vupen.com/english/advisories/2006/4239
http://www.sophos.com/support/knowledgebase/article/7609.html
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=452
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=451
Credits
Vulnerabilities reported by iDefense Labs
ChangeLog
2006-10-29 : Initial release
2006-12-08 : Updated References
Vulnerability Management
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