Check Point Advisories

MIT Kerberos 5 recvauth Denial Of Service (CVE-2014-5355)

Check Point Reference: CPAI-2015-0566
Date Published: 13 May 2015
Severity: High
Last Updated: Sunday 29 November, 2015
Source: MIT
Industry Reference:CVE-2014-5355
Protection Provided by:

Security Gateway
R81, R80, R77, R75
Who is Vulnerable? MIT Kerberos krb5-1.13.1 and prior
Vulnerability Description A denial of service vulnerability exists in MIT Kerberos 5. The vulnerability occurs when recvauth_common() calls krb5_read_message() to receive and process a crafted message causing it to return an invalid string that later causes a NULL pointer dereference or an attempt to read beyond the end of a buffer. A remote, unauthenticated attacker can exploit this vulnerability by sending a crafted message to an application,
such as klogind, that use the krb5_recvauth() API.

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 MIT Kerberos 5 recvauth Denial Of Service 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:  Application Servers Protection Violation.
Attack Information:  MIT Kerberos 5 recvauth Denial Of Service

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