Check Point Advisories

GNU gzip LZH Decompression make_table Stack Modification (CVE-2006-4335)

Check Point Reference: CPAI-2006-298
Date Published: 31 Mar 2010
Severity: High
Last Updated: Wednesday 31 March, 2010
Source:
Industry Reference:CVE-2006-4335
Protection Provided by:

Security Gateway
R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description GNU gzip is a popular compression and decompression utility that ships with all standard Linux distributions, as well as commercial Unix-based operating systems. The utility can create and decompress files which are stored using the DEFLATE algorithm. In addition to the algorithm used in the archives, the application is capable of decompressing archives created with other programs. There exists an array indexing error vulnerability in the GNU gzip application. The flaw is due to an improper boundary checks when decompressing LZH archives. An attacker may leverage this vulnerability to cause the affected product to terminate unexpectedly and potentially execute arbitrary code on the target system. In case of an attack where code injection is not successful, the affected application will terminate abnormally. In case of an attack where code injection and execution is successful, the behavior of the target is entirely dependent on the intended function of the injected code. The code in such a case would execute within the security context of the current user. The risk of an attack resulting in successful exploitation is increased on 64 bit systems.

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 GNU gzip LZH Decompression make_table Stack Modification 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:  Content Protection Violation.
Attack Information:  GNU gzip LZH decompression make_table stack modification

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