Check Point Advisories

Microsoft CryptoAPI Object Identifiers Integer Overflow (MS09-056) - Ver2 (CVE-2009-2511)

Check Point Reference: CPAI-2014-2403
Date Published: 28 Dec 2014
Severity: High
Last Updated: 19 Nov 2017
Industry Reference:CVE-2009-2511
Protection Provided by:

Security Gateway
R80, R77, R76, R75

Who is Vulnerable?
Vulnerability Description The CryptoAPI provide services that enable application developers to add encryption/decryption of data, authentication using digital certificates, and encoding to and decoding from Abstract Syntax Notation One (ASN.1) to their Windows-based applications. A spoofing vulnerability has been reported in the Microsoft Windows CryptoAPI component when parsing ASN.1 object identifiers from X.509 certificates. The vulnerability is due to an error in the Windows CryptoAPI that incorrectly parses a null terminator as the end of any values identified by an Object Identifier (OID). This causes the CryptoAPI to only parse part of the actual value. When this partial value has meaning to the end user, this may lead to a situation where an attacker could impersonate another user or 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, click on Protection tab and select the version of your choice.

Security Gateway R80 / R77 / R76 / R75

  1. In the IPS tab, click Protections and find the Microsoft CryptoAPI Object Identifiers Integer Overflow (MS09-056) - Ver2 protection using the Search tool and Edit the protection's settings.
  2. Install policy on all modules.

This protection's log will contain the following information:

Attack Name:  HTTP Protocol Inspection.
Attack Information:  Microsoft CryptoAPI Object Identifiers Integer Overflow (MS09-056) - Ver2

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