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

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Check Point Reference: CPAI-2012-017
Date Published:
Severity:
Source: Microsoft Security Bulletin MS12-007
Industry Reference(s): CVE-2012-0007
Protection Provided by: Security Gateway
  • R75
  • R71
  • R70
IPS-1
  • IPS-1
  • IPS-1 NGX R65
Who is Vulnerable?
Microsoft Anti-Cross Site Scripting Library V3.x
Microsoft Anti-Cross Site Scripting Library V4.0
Vulnerability Description
An information disclosure vulnerability has been reported in the Microsoft Anti-Cross Site Scripting (AntiXSS) Library.
Vulnerability Details
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 the transferring of specially crafted HTML.

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, Protection tab and select the version of your choice.

To configure the defense, select your product from the list below and follow the related protection steps.

Security Gateway R75 / R71 / R70

How Can I Protect My Network?
1. 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. 2. Install policy on all modules.

How Do I Know if My Network is Under Attack?
SmartView Tracker will log the following entries:
Attack Name: Web Client Enforcement Violation
Attack Information: Microsoft AntiXSS Library bypass information disclosure (MS12-007)

IPS-1 & IPS-1 NGX R65

How Can I Protect My Network?

  1. In the IPS-1 Policy Manager, click on the Protection tab.
  2. In the Protection tree, click Web Intelligence > HTML , and select the Internet Explorer protection group.
  3. Click Microsoft AntiXSS Library Bypass Information Disclosure (MS12-007).
  4. In the configuration pane, under Settings, check Active.
  5. Click on Install Policy.

How Do I Know if My Network is Under Attack?
Upon attack, the following entries will be logged:

Alert Name: Internet Explorer Vulnerabilities.
Description: Microsoft AntiXSS Library Bypass Information Disclosure (MS12-007).