Check Point Advisories

X.Org X Server PCF Font Parser Buffer Overflow (CVE-2008-0006)

Check Point Reference: CPAI-2008-244
Date Published: 25 Feb 2010
Severity: Medium
Last Updated: Thursday 25 February, 2010
Source:
Industry Reference:CVE-2008-0006
Protection Provided by:

Security Gateway
R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description X.Org foundation's X Window System (commonly X11 or X Window) is a networking and display protocol which provides windowing on bitmap displays. It provides the standard toolkit and protocol to build graphical user interfaces (GUIs) on Unix-like operating systems and OpenVMS, and is supported by almost all other modern operating systems. A buffer overflow vulnerability exists in the X.Org Foundation's X Windows Server. The vulnerability is due to boundary error when processing PCF Fonts. A remote attacker can exploit this vulnerability by enticing the target user to open maliciously constructed PCF Font files, potentially causing arbitrary code to be injected and executed in the security context of the logged-in user. In an attack case where code injection is not successful, the affected application will terminate unexpectedly. This will create a denial of service condition. In a more sophisticated attack case where code injection 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 running application.

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 X.Org X Server PCF Font Parser 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:  Application Servers Protection Violation.
Attack Information:  X.Org X Server PCF Font parser buffer overflow

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