Check Point Advisories

Microsoft XML Signature HMAC Truncation Bypass (MS10-041) - Ver2 (CVE-2009-0217)

Vulnerability
Protection

Check Point Reference:	CPAI-2015-0358
Date Published:	26 Mar 2015
Severity:	Medium
Last Updated:	Thursday 26 March, 2015
Source:
Industry Reference:	CVE-2009-0217
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description	The Microsoft .NET Framework is a component of the Microsoft Windows operating system that enables building and running software applications and Web services. A tampering vulnerability exists in the Microsoft .NET Framework that could allow an attacker to tamper with signed XML content without being detected. The vulnerability is caused by the way that the W3C XML Signature Syntax and Processing (XMLDsig) recommendation has been implemented in the Microsoft .NET Framework. An attacker could exploit this issue by sending a specially crafted XML content to a vulnerable system. Successful exploitation of this vulnerability could allow an attacker to bypass certain cryptographic signatures and as a result, tamper with signed XML content without the receiver detecting the changes.

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, 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 XML Signature HMAC Truncation Bypass (MS10-041) - Ver2 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: HTTP Protocol Inspection.
Attack Information: Microsoft XML Signature HMAC Truncation Bypass (MS10-041) - Ver2