Check Point Advisories

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

Vulnerability
Protection

Check Point Reference:	CPAI-2012-255
Date Published:	12 Jun 2012
Severity:	High
Last Updated:	Sunday 23 February, 2025
Source:	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 Avaliable	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.

Security Gateway R75 / R71 / R70

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.
Install policy on all modules.

SmartView Tracker will log the following entries:
Attack Name: Web Client Enforcement Violation
Attack Information: Internet Explorer HTML Sanitization Information Disclosure (MS12-039)