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Internet Explorer HTML Sanitization Information Disclosure (MS12-039; CVE-2012-1858)


Check Point Reference: CPAI-2012-255
Date Published:
Source: Microsoft Security Bulletin MS12-039
Industry Reference(s): CVE-2012-1858
Protection Provided by: Security Gateway
  • R70
  • R71
  • R75
Who is Vulnerable?
Internet Explorer 8
Internet Explorer 9
Vulnerability Description
An information disclosure vulnerability has been reported in Microsoft Internet Explorer.
Update/Patch Available
Apply patches from: MS12-039
Vulnerability Details
The vulnerability is due to the way that the toStaticHTML API within Internet Explorer handles content using specific strings when sanitizing HTML. A remote attacker could exploit this vulnerability by enticing a target user to open a specially crafted web page. Successful exploitation could allow an attacker to perform cross-site scripting attacks against affected users, resulting in script execution in the target's security context.

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, 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 Internet Explorer HTML Sanitization Information Disclosure (MS12-039) 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: Internet Explorer HTML Sanitization Information Disclosure (MS12-039)