Check Point Advisories

OpenSSL DTLS Retransmission Denial of Service (CVE-2013-6450)

Vulnerability
Protection

Check Point Reference:	CPAI-2014-1083
Date Published:	6 Mar 2014
Severity:	High
Last Updated:	Thursday 15 October, 2015
Source:	OpenSSL Project
Industry Reference:	CVE-2013-6450
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	OpenSSL Project OpenSSL 1.0.0x prior to 1.0.0l OpenSSL Project OpenSSL 1.0.1x prior to 1.0.1f
Vulnerability Description	A use after free vulnerability has been reported in OpenSSL's handling of DTLS. The flaw is due to the clearing of DTLS context variable prior to a retransmission. This could lead to the OpenSSL application crashing resulting in a denial of service condition. A remote attacker could exploit this vulnerability by sending certain DTLS packets requesting a retransmission. Successful exploitation of this vulnerability can 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, 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 OpenSSL DTLS Retransmission 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: OpenSSL Enforcement Violation.
Attack Information: OpenSSL DTLS Retransmission Denial of Service