Check Point Advisories

GnuTLS libtasn1 _asn1_extract_der_octet Memory Access Error (CVE-2015-3622)

Check Point Reference: CPAI-2015-0855
Date Published: 16 Jul 2015
Severity: High
Last Updated: Sunday 14 February, 2016
Source: GnuTLS
Industry Reference:CVE-2015-3622
Protection Provided by:

Security Gateway
R81, R80, R77, R75
Who is Vulnerable? GnuTLS libtasn1 prior to 4.5
Vulnerability Description A memory access error vulnerability exists in libtasn1, a component of GnuTLS. The vulnerability is due to a flaw in _asn1_extract_der_octet() that causes libtasn1 to read beyond the allocated buffer when processing a specially crafted DER-encoded input. A remote attacker can exploit this vulnerability in GnuTLS by sending a crafted ASN.1 certificate to a target application.

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

  1. In the IPS tab, click Protections and find the GnuTLS libtasn1 _asn1_extract_der_octet Memory Access Error protection using the Search tool and Edit the protection's settings.
  2. Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name:  SSL Enforcement Violation.
Attack Information:  GnuTLS libtasn1 _asn1_extract_der_octet Memory Access Error

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