Check Point Advisories

Sophos Anti-Virus ZIP File Handling Denial of Service (CVE-2005-1530)

Check Point Reference: CPAI-2005-272
Date Published: 19 Oct 2009
Severity: High
Last Updated: Monday 19 October, 2009
Source:
Industry Reference:CVE-2005-1530
Protection Provided by:

Security Gateway
R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description Sophos Anti-Virus (AV) is a product that provides virus scanning functionality for desktop and server systems. It can scan files on the local system or files downloaded from network for known viruses, Trojans, and other malicious programs. The AV product is capable of interpreting numerous compression formats and algorithms such as PKZIP, rar, and BZIP2. There exists a denial of service vulnerability in the component of Sophos Anti-Virus that handles compressed files. The vulnerability is caused due to a flaw that can result in an infinite loop. A remote attacker can exploit the vulnerability by sending a specially crafted compressed file to a target running the vulnerable product, causing a denial of service. Upon scanning the malformed ZIP file from the attacker, the vulnerable host performance is degraded immediately. The CPU usage will be 100% continuously, until the AV process is killed or the target computer is restarted. The on-demand virus scanning functionality provided by the vulnerable product is unavailable until the target computer is restarted. However, the on-access virus scanning functionality remains available under attack.

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

  1. In the IPS tab, click Protections and find the Sophos Anti-Virus ZIP File Handling Denial of Service protection using the Search tool and Edit the protection's settings.
  2. 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 ZIP file handling denial of service

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