Check Point Advisories

Microsoft AntiXSS Library Bypass Information Disclosure (MS12-007; CVE-2012-0007)

Vulnerability
Protection

Check Point Reference:	CPAI-2012-017
Date Published:	10 Jan 2012
Severity:	High
Last Updated:	Thursday 10 May, 2012
Source:
Industry Reference:	CVE-2012-0007
Protection Provided by:	Security Gateway R81, R80, R77, R75, R71, R70
Who is Vulnerable?
Vulnerability Description	An information disclosure vulnerability has been reported in the Microsoft Anti-Cross Site Scripting (AntiXSS) Library. The vulnerability is due to the way the AntiXSS Library incorrectly evaluates certain characters after a CSS escaped character is detected. A remote attacker may exploit this issue by sending a specially crafted HTML to a target website that is using the sanitization module of the AntiXSS Library. Successful exploitation could allow an attacker to expose sensitive information not intended to be disclosed.

Protection Overview

This protection will detect and block attempts to open a specially crafted web-page.

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 / R71 / R70

In the IPS tab, click Protections and find the Microsoft AntiXSS Library Bypass Information Disclosure (MS12-007) 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 AntiXSS library bypass information disclosure (MS12-007)