Check Point Advisories

Microsoft Internet Explorer Vector Markup Language VGX Buffer Overflow (CVE-2007-1749)

Vulnerability
Protection

Check Point Reference:	CPAI-2007-309
Date Published:	26 Sep 2010
Severity:	High
Last Updated:	Tuesday 05 May, 2015
Source:
Industry Reference:	CVE-2007-1749
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	Microsoft Internet Explorer 5.01 Microsoft Internet Explorer 6 Microsoft Internet Explorer 7
Vulnerability Description	Microsoft Internet Explorer (IE) is the most widely used web browser application. The browser is capable of processing HTML, XML, images, scripting languages, and various other popular Internet specifications. Starting from version 5.0, IE is capable of interpreting the Vector Markup Language (VML). A buffer overflow vulnerability exists in the Vector Markup Language (VML) implementation in Microsoft Windows. The vulnerability is caused due to an integer underflow in the VML implementation (vgx.dll) when receiving compressed HTTP response. Remote attackers can exploit this vulnerability by enticing the target user to visit a malicious webpage, to cause a heap-based buffer overflow and possibly inject and execute arbitrary code on the target system with the privileges of the currently logged in user. In case of an attack where code injection is not successful, the affected application will terminate abnormally. In case of an attack where code injection and execution 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 current user.

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 Internet Explorer Vector Markup Language VGX Buffer Overflow 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: Web Client Enforcement Violation.
Attack Information: Microsoft Internet Explorer Vector Markup Language VGX buffer overflow