Check Point Advisories

avast! Antivirus ACE File Handling Buffer Overflow (CVE-2005-2385)

Check Point Reference: CPAI-2005-276
Date Published: 15 Jul 2010
Severity: High
Last Updated: Thursday 15 July, 2010
Source:
Industry Reference:CVE-2005-2385
Protection Provided by:

Security Gateway
R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description avast! antivirus is a product line consisting of several antivirus scanners for both desktop and server systems. The avast! scanner products are capable of on-access and on-demand scanning. The product line is also capable of scanning inside archived files. It supports numerous archive formats, one of which is the widely used ACE compression format. There exists a stack-based buffer overflow vulnerability in avast! antivirus. The vulnerability is a result of improper boundary checking when scanning ACE files. An attacker can exploit this vulnerability to inject and execute arbitrary code. Any code injected will be executed with the privileges of the antivirus service, normally System. In a simple attack case aimed at creating a denial of service condition, only the affected thread will terminate. The vulnerable program as a whole will still function normally. In a more sophisticated attack scenario, where the malicious user is successful in injecting and executing supplied code, the behavior of the system is dependent on the nature the injected code. Any code injected into the vulnerable component would execute in the security context of the affected process, normally System.

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 avast! Antivirus ACE File Handling Buffer Overflow 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:  avast! Antivirus ACE File Handling Buffer Overflow

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