Check Point Advisories

Microsoft Internet Authentication Service MS-CHAP Security Bypass - Ver2 (CVE-2009-3677)

Vulnerability
Protection

Check Point Reference:	CPAI-2014-1240
Date Published:	31 Mar 2014
Severity:	High
Last Updated:	Monday 31 March, 2014
Source:	CVE-2009-3677
Protection Provided by:	Security Gateway R77 R76 R75
Who is Vulnerable?
Vulnerability Description	A security bypass vulnerability has been reported in the Internet Authentication Service. The vulnerability is due to an error in the Internet Authentication Service that fails to correctly validate MS-CHAP v2 authentication requests. Successful exploitation of this vulnerability would allow a remote attacker to obtain sensitive information and access restricted resources on the vulnerable system.

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 R77 / R76 / R75 / R71 / R70

In the IPS tab, click Protections and find the Microsoft Internet Authentication Service MS-CHAP Security Bypass - Ver2 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:  HTTP Protocol Inspection.
Attack Information:  Microsoft Internet Authentication Service MS-CHAP Security Bypass - Ver2