Check Point Advisories

MIT Kerberos KDC Authentication Denial of Service (CVE-2010-0283)

Vulnerability
Protection

Check Point Reference:	CPAI-2011-262
Date Published:	17 May 2011
Severity:	High
Last Updated:	Tuesday 10 November, 2015
Source:
Industry Reference:	CVE-2010-0283
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description	Kerberos is a protocol that allows for the negotiation of an authenticated, and optionally encrypted, communication channel between two points on a network. Kerberos authentication is performed using authentication tokens called tickets. When using Kerberos to establish authenticated communications, a client sends a request for a ticket to the Key Distribution Center (KDC). A denial of service vulnerability has been reported in MIT's Kerberos. The vulnerability is due to an assertion failure when handling invalid Authentication Service requests. A remote attacker may exploit this issue by sending a crafted AS-REQ packet to the target KDC. Successful exploitation of this vulnerability would cause the KDC to crash, creating a denial of service condition.

Protection Overview

This protection will detect and block crafted packets sent to the vulnerable KDC.

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 MIT Kerberos KDC Authentication 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: Application Servers Protection Violation.
Attack Information: MIT Kerberos KDC authentication denial of service