Check Point Advisories

Sophos Anti-Virus RAR VMSF_DELTA Filter Signedness Error

Vulnerability
Protection

Check Point Reference:	CPAI-2013-006
Date Published:	6 Mar 2013
Severity:	High
Last Updated:	Wednesday 06 March, 2013
Source:
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description	An signedness error vulnerability exists in Sophos Anti-Virus. The vulnerability is due to insufficient validation of one of the parameters of the VMSF_DELTA filter while parsing RAR files. A remote attacker could exploit this vulnerability by causing Sophos Anti-Virus to process a specially crafted RAR file.

Protection Overview

This protection will detect and block attempts to exploit this vulnerability.

In order for the protection to be activated, update your Security Gateway product to the latest IPS update. For information on how to update IPS, go to SBP-2006-05, click on Protection tab and select the version of your choice.

Security Gateway R80 / R77 / R75

In the IPS tab, click Protections and find the Sophos Anti-Virus RAR VMSF_DELTA Filter Signedness Error protection using the Search tool and Edit the protection's settings.
Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name: Security Products Enforcement Violation.
Attack Information: Sophos anti-virus RAR VMSF_DELTA filter signedness error