Check Point Advisories

GnuTLS libtasn1 ASN1 Length DER Decoding Buffer Overflow (CVE-2012-1569)

Vulnerability
Protection

Check Point Reference:	CPAI-2012-291
Date Published:	2 Jul 2012
Severity:	Critical
Last Updated:	Friday 19 April, 2024
Source:	CVE-2012-1569
Protection Provided by:	Security Gateway R75
Who is Vulnerable?	Free Software Foundation Libtasn1 Prior to 2.12
Vulnerability Description	A buffer overflow vulnerability has been reported in libtasn1, a component of GnuTLS.
Vulnerability Details	The vulnerability is due to an error in the libtasn1 library while handling length fields within the ASN.1 fields. A remote attacker can exploit this vulnerability by sending specially crafted certificates to the target service. Successful exploitation would allow an attacker to execute arbitrary code in the security context of the affected service. An exploitation attempt may also cause the service to crash, resulting in a denial of service condition.

Protection Overview

This protection will detect and block attempts to exploit this vulnerability.

In order for the protection to be activated, update your product to the latest update. For information on how to update , go to SBP-2006-05, Protection tab and select the version of your choice.

Security Gateway R75 / R71 / R70

In the IPS tab, click Protections and find the GnuTLS libtasn1 ASN1 Length DER Decoding Buffer Overflow protection using the Search tool and Edit the protection's settings.
Install policy on all modules.

SmartView Tracker will log the following entries:
Attack Name: OpenSSL Enforcement Violation
Attack Information: GnuTLS libtasn1 ASN1 Length DER Decoding Buffer Overflow