Check Point Advisories

ClamAV libclamav MEW PE File Handling Integer Overflow (CVE-2007-6335)

Vulnerability
Protection

Check Point Reference:	CPAI-2007-365
Date Published:	1 Oct 2009
Severity:	High
Last Updated:	Thursday 01 May, 2014
Source:
Industry Reference:	CVE-2007-6335
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description	ClamAV AntiVirus is an open source product that provides anti-virus scanning utilities and an anti-virus library. The product is capable of decoding several archive formats in order to scan their internal items for viruses. One of such archive formats is the MEW file format. A buffer overflow vulnerability exists in the ClamAV AntiVirus product. The vulnerability can be triggered when the application processes crafted PE files. An unauthenticated attacker can exploit this vulnerability by delivering a crafted file to the scanning service resulting in injection and execution of arbitrary code. In a simple attack case aimed at creating a denial of service condition, the affected ClamAV daemon will terminate. This might allow for further exploitation of the target system, exposing the system to other threats in absence of the AntiVirus daemon. In a sophisticated attack scenario where the malicious user is successful in injecting and executing supplied code, the behaviour of the system is dependent on the nature of the injected code. Any code injected into the vulnerable component would execute in the security context of the affected ClamAV daemon.

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 ClamAV libclamav MEW PE File Handling Integer Overflow 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: ClamAV libclamav MEW PE file handling integer overflow