Check Point Advisories

GnuTLS TLS Record Application GenericBlockCipher Parsing Integer Overflow (CVE-2012-1573)

Vulnerability
Protection

Check Point Reference:	CPAI-2012-298
Date Published:	3 Sep 2012
Severity:	Critical
Last Updated:	Sunday 21 December, 2014
Source:
Industry Reference:	CVE-2012-1573
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description	An integer overflow vulnerability has been reported in GnuTLS. The vulnerability is due to improper handling of certain fields during the decryption process. A remote attacker can exploit this vulnerability by sending a specially crafted TLS Application Data packet to the server. Successful exploitation would allow an attacker to execute arbitrary code on the target server.

Protection Overview

This protection will detect and block the transferring of a malicious message to the target server.

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 GnuTLS TLS Record Application GenericBlockCipher Parsing Integer Overflow 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: GnuTLS TLS record application GenericBlockCipher parsing integer overflow