Check Point Advisories

MIT Kerberos V5 KAdminD klog_vsyslog Server Stack Buffer Overflow (CVE-2007-0957)

Vulnerability
Protection

Check Point Reference:	CPAI-2007-252
Date Published:	27 Jul 2010
Severity:	High
Last Updated:	Tuesday 01 November, 2011
Source:
Industry Reference:	CVE-2007-0957
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description	Kerberos is a protocol suite which allows for the negotiation of authenticated, and optionally encrypted, communication between two points on a network. MIT Kerberos V5 is an implementation of this protocol suite. There exists a buffer overflow vulnerability in MIT Kerberos. The vulnerability is due to a boundary error in the server's logging function in the Kerberos Administration Server (kadmind). A remote, authenticated attacker can exploit this vulnerability by supplying a specially crafted string to the kadmind daemon. Successful exploitation would cause a stack based buffer overflow that can lead to compromising the Kerberos key database, or executing arbitrary code with root privileges on the target host. In a simple attack aiming for denial of service, the Kerberos Administration service (kadmind) will terminate abnormally as a result of an attack. The Kerberos administration functionality remains unavailable until the service is restarted. In a more sophisticated attack scenario, where the malicious user is successful in injecting and executing supplied code, the behavior of the system is dependent on the nature the injected code. Any code injected into the vulnerable component would execute in the security context of the service process, which may be system/root level.

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

In the IPS tab, click Protections and find the MIT Kerberos V5 KAdminD klog_vsyslog Server Stack Buffer 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: Application Servers Protection Violation.
Attack Information: MIT Kerberos V5 KAdminD klog_vsyslog server stack buffer overflow