Check Point Advisories

Microsoft Windows DNS Client Buffer Overrun (CVE-2006-3441)

Check Point Reference: CPAI-2006-232
Date Published: 7 Jun 2010
Severity: High
Last Updated: Wednesday 29 April, 2015
Source:
Industry Reference:CVE-2006-3441
Protection Provided by:

Security Gateway
R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description There exists a buffer overflow vulnerability in the DNS client component of Microsoft Windows. The flaw is caused by the improper processing of crafted DNS messages. A remote attacker may leverage this vulnerability by sending crafted DNS responses to the affected service, resulting in the possible injection and execution of arbitrary code on the target system. Any injected code would be executed within the security context of the System user. In an attack case where code injection is not successful, the affected service will terminate abnormally. As the service is integral to the function of the operating system, the operating system will be shutdown. It is likely that the system will continue this behavior after restarting, since it will attempt to use the DNS service to locate certain servers upon startup. In a more sophisticated attack where code injection results 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 SYSTEM account.

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 Microsoft Windows DNS Client Buffer Overrun 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:  DNS Enforcement Violation.
Attack Information:  Microsoft Windows DNS client buffer overrun

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