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:	Thursday 09 January, 2025
Source:
Protection Provided by:	Security Gateway R75
Who is Vulnerable?	Sophos Threat Detection Engine Prior to 3.37.2
Vulnerability Description	A 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 product to the latest update. For information on how to update , go to SBP-2006-05, Protection tab and select the version of your choice.

Security Gateway R75 / R71 / R70

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 modules.

SmartView Tracker will log the following entries:
Attack Name: Security Products Enforcement Violation
Attack Information: Sophos Anti-Virus RAR VMSF_DELTA Filter Signedness Error