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OpenSSL ssl_get_algorithm2 TLS Denial of Service - ver 2 (CVE-2013-6449)


Check Point Reference: CPAI-2014-1170
Date Published:
Last Updated:
Source: OpenSSL Project
Industry Reference(s): CVE-2013-6449
Protection Provided by: Security Gateway
  • R75 and above
Who is Vulnerable?
OpenSSL Project OpenSSL 1.0.1x prior to 1.0.1f
Vulnerability Description
A denial of service vulnerability has been reported in OpenSSL. The vulnerability is due to an error in ssl_get_algorithms2() where the SSL/TLS version is obtained from an incorrect structure leading to a NULL pointer dereference when computing a message digest. A remote unauthenticated attacker can exploit this vulnerability to cause a denial of service condition on applications that use the vulnerable version of the OpenSSL library.

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.

To configure the defense, select your product from the list below and follow the related protection steps.

Security Gateway R70 / R71 / R75 and above

How Can I Protect My Network?

  1. In the IPS tab, click Protections and find the OpenSSL ssl_get_algorithm2 TLS Denial of Service - ver 2 protection using the Search tool and Edit the protection's settings.
  2. Install policy on all modules.

How Do I Know if My Network is Under Attack?
SmartView Tracker will log the following entries:

Attack Name:  SSL Enforcement Violation.
Attack Information:  OpenSSL ssl_get_algorithm2 TLS Denial of Service - ver 2