Check Point Advisories

MIT Kerberos ASN.1 asn1_decode_generaltime Uninitialized Pointer Reference (CVE-2009-0846)

Check Point Reference: CPAI-2009-096
Date Published: 27 Apr 2009
Severity: Critical
Last Updated: 17 Mar 2016
Industry Reference:CVE-2009-0846
Protection Provided by:

Security Gateway
R80, R77, R76, R75, R71, R70

Who is Vulnerable?
Vulnerability Description MIT Kerberos V5 is an implementation of the Kerberos protocol that allows for the negotiation of an authenticated, and optionally encrypted, communication channel between two points on a network. The MIT Kerberos V5 server utilizes the encrypted SUN-RPC protocol to communicate with its remote clients.A memory corruption vulnerability has been discovered in the MIT Kerberos server. The vulnerability is due to an error in the MIT Kerberos server due to the release of an uninitialized pointer in the ASN.1 decoder while decoding maliciously crafted data. A remote attacker may exploit this vulnerability via a specially crafted RPC request sent to the kadmind daemon. Successful exploitation may create a denial of service condition, causing the Kerberos kadmind service to terminate abnormally, and may allow execution of arbitrary code on the target system.

Protection Overview

This protection will detect and block malformed RPC requests sent to the vulnerable 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 / R76 / R75 / R71 / R70

  1. In the IPS tab, click Protections and find the MIT Kerberos ASN.1 asn1_decode_generaltime Uninitialized Pointer Reference protection using the Search tool and Edit the protection's settings.
  2. Install policy on all modules.

This protection's log will contain the following information:

Attack Name:  SUN-RPC Enforcement Protection.
Attack Information:  MIT Kerberos ASN.1 asn1_decode_generaltime uninitialized pointer reference