Check Point Advisories

ISC BIND CNAME RRSIG Request Denial of Service (CVE-2011-2465)

Vulnerability
Protection

Check Point Reference:	CPAI-2011-510
Date Published:	15 Nov 2011
Severity:	Critical
Last Updated:	Sunday 12 January, 2014
Source:
Industry Reference:	CVE-2011-2465
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description	A denial of service vulnerability has been reported in ISC BIND. The vulnerability is due to an error while handling RRSIG requests. A remote attacker may exploit this vulnerability by sending a crafted RRSIG request to an affected server. Successful attack may cause the service to terminate abnormally, resulting in a denial of service condition.

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 ISC BIND CNAME RRSIG Request 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: DNS Enforcement Violation.
Attack Information: ISC BIND CNAME RRSIG query with RPZ denial of service