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Preemptive Protection against Microsoft SharePoint HTML Sanitization Cross-site Scripting (MS12-050; CVE-2012-1858)


Check Point Reference: CPAI-2012-309
Date Published:
Preemptive Since:
Source: Microsoft Security Bulletin MS12-050
Industry Reference(s): CVE-2012-1858
Protection Provided by: Security Gateway
  • R70
  • R71
  • R75
Who is Vulnerable?
Microsoft Office Client Software
Microsoft SharePoint Server
Microsoft Groove Server
Windows SharePoint Services and Microsoft SharePoint Foundation
Vulnerability Description
A cross-site scripting vulnerability has been reported in Microsoft SharePoint.
Update/Patch Available
Apply patches from: MS12-050
Vulnerability Details
The vulnerability is due to an error in the way HTML strings are sanitized. A remote attacker can exploit this vulnerability by submitting a specially crafted script to a target site that use HTML sanitization. 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.

No update is required to address this vulnerability

Users are protected against this vulnerability if the Internet Explorer HTML Sanitization Information Disclosure (MS12-039) protection found in the Protection section of CPAI-2012-255 has been applied.

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)