Check Point Advisories

ISC BIND RRSIG Query Denial of Service (CVE-2011-1907)

Vulnerability
Protection

Check Point Reference:	CPAI-2012-401
Date Published:	23 Sep 2012
Severity:	Critical
Last Updated:	Sunday 23 September, 2012
Source:
Industry Reference:	CVE-2011-1907
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 caused due to an assertion error failure while processing RRSIG queries. A remote attacker can exploit this issue by sending RRSIG requests to the target server. Successful exploitation would cause the server to become unresponsive, 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 RRSIG Query 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 RRSIG Query Denial of Service