Check Point Advisories

Apache HTTP Server mod_tcl Module Format String (CVE-2006-4154)

Check Point Reference: CPAI-2006-309
Date Published: 2 May 2011
Severity: High
Last Updated: Monday 14 April, 2014
Source:
Industry Reference:CVE-2006-4154
Protection Provided by:

Security Gateway
R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description Apache HTTP server is the most widely deployed web server product on the Internet. Apache HTTP server is capable of running on many platforms, including Microsoft Windows and a wide variety of Unix-like platforms. The Apache HTTP server is very flexible and customizable in many aspects of its functionality. External modules are often supplied by third parties to extend the server's functionality. There exists a format string vulnerability in the mod_tcl module used with the Apache HTTP server. The vulnerability is due to the failure of the application in verifying string arguments that are passed to a formatting function, resulting in a memory corruption condition. A remote attacker can exploit this vulnerability to inject and execute arbitrary code with the privileges of the httpd process. In a simple attack exploiting this vulnerability, the httpd process serving the attacker terminates, closing the connection as a result. This might also reset other connections served by the affected httpd process, in the case the HTTP server is configured to run in multiple-threading mode. In the case of a more sophisticated attack, the injected arbitrary code is executed with the privileges of the httpd process. The behaviour of the target system will be dependent on the malicious code.

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 Apache HTTP Server mod_tcl Module Format String 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:  Apache Server Protection Violation.
Attack Information:  Apache HTTP server mod_tcl module format string

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