Check Point Advisories

X.Org X Font Server Handlers Integer Overflow (CVE-2007-4568)

Check Point Reference: CPAI-2007-370
Date Published: 30 Dec 2009
Severity: Critical
Last Updated: Thursday 12 November, 2015
Source:
Industry Reference:CVE-2007-4568
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. There exists a vulnerability in the way X.Org Font Server handles certain incoming protocol requests. More specifically, the vulnerability is due to a lack of proper field validation of the mentioned requests. By sending specially crafted requests, an unauthenticated remote attacker can leverage this flaw to execute arbitrary code on the target host with root or System level privileges. In case of an attack where code injection is not successful, the affected service will terminate unexpectedly. This will create a denial of service condition of the affected service. In case of a more sophisticated attack where code injection and execution is successful, the behavior of the target is entirely dependent on the intended purpose of the injected code. The code in such a case would execute within the security context of the running 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 X.Org X Font Server Handlers Integer 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 Font Server handlers integer overflow

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