Check Point Advisories

Microsoft Windows LNK File Shell Buffer Overflow (MS05-049; CVE-2005-2122)

Vulnerability
Protection

Check Point Reference:	CPAI-2005-318
Date Published:	24 Nov 2009
Severity:	High
Last Updated:	Tuesday 24 November, 2009
Source:
Industry Reference:	CVE-2005-2122
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description	The Microsoft Windows operating system provides a facility to create soft links to files on the file system which are referred to as shortcuts. A shortcut file may be created for any kind of file, binary executables, text files, or any other miscellaneous file types. Shortcut files are created with the lnk file extension. A vulnerability exists in several versions of the Microsoft Windows Shell component. The vulnerability is created by a lack of user input verification checks by the affected component. Exploitation of this vulnerability may allow an attacker to divert the process flow of the vulnerable process. In a simple attack case aimed at creating a denial of service condition, the Windows system will shut down. The system must be restarted manually in order for functionality to be resumed. In a more sophisticated attack scenario, where the malicious user is successful in injecting and executing supplied code, the behavior of the system is dependent on the nature the injected code. Any code injected into the vulnerable component will execute in the security context of 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

In the IPS tab, click Protections and find the Microsoft Windows LNK File Shell Buffer Overflow (MS05-049) protection using the Search tool and Edit the protection's settings.
Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name: Content Protection Violation.
Attack Information: Microsoft Windows LNK file Shell buffer overflow (MS05-049)