Check Point Advisories

Microsoft ASP.NET Authentication Bypass Elevation of Privilege (MS11-100; CVE-2011-3416)

Vulnerability
Protection

Check Point Reference:	CPAI-2012-012
Date Published:	3 Jan 2012
Severity:	Critical
Last Updated:	Thursday 16 May, 2013
Source:
Industry Reference:	CVE-2011-3416
Protection Provided by:	Security Gateway R81, R80, R77, R75, R71, R70
Who is Vulnerable?
Vulnerability Description	An elevation of privilege vulnerability has been reported in Microsoft ASP.NET. The vulnerability is due to an error in the way that .NET Framework authenticates usernames. A remote unauthenticated attacker may exploit this vulnerability by sending a specially crafted web request to the ASP.NET application. To exploit this vulnerability, an attacker would need to be able to register an account on the ASP.NET application, and must know an existing account name for a targeted user. Successful exploitation could allow an attacker to take any action in the context of the targeted user, including executing arbitrary commands on the site.

Protection Overview

This protection will detect and block the transferring of specially crafted web requests.

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 ASP.NET Authentication Bypass Elevation of Privilege (MS11-100) 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 Server Enforcement Violation.
Attack Information: Microsoft ASP.NET authentication bypass elevation of privilege