Check Point Advisories

Microsoft Telnet and WinHTTP Multiple Services Denial of Service

Vulnerability
Protection

Check Point Reference:	CPAI-2011-352
Date Published:	26 Jul 2011
Severity:	High
Last Updated:	Tuesday 06 September, 2011
Source:
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description	Multiple Denial of Service (DoS) vulnerabilities have been reported in Microsoft Windows Telnet and WinHTTP. Remote attackers can trigger these vulnerabilities by sending specially crafted malicious requests to the affected services. The vulnerabilities are due to a design flaw in Microsoft Telnet's and WinHTTP's user authentication mechanism. Successful exploitation of these vulnerabilities may lead to a DoS condition, which may cause the server to become unresponsive.

Protection Overview

This protection will detect and block attempts to exploit these vulnerabilities

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

In the IPS tab, click Protections and find the Microsoft Telnet and WinHTTP Multiple Services Denial of Service 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 Telnet and WinHTTP multiple denial of service vulnerabilities