Check Point Advisories

ISC BIND DNSSEC Validation Multiple RRsets Denial of Service (CVE-2007-0494)

Check Point Reference: CPAI-2007-228
Date Published: 22 Feb 2010
Severity: High
Last Updated: Monday 22 February, 2010
Source:
Industry Reference:CVE-2007-0494
Protection Provided by:

Security Gateway
R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description The Domain Name System (DNS) is a system of mapping host names to IP addresses. Domain names consist of alphabetic characters such that they are
easier for human to remember. BIND (Berkeley Internet Name Domain) is an implementation of the DNS protocol and provides an openly redistributable reference implementation of the major
components of the Domain Name System. A denial of service vulnerability exists in ISC BIND, the DNS server implementation by Internet Systems Consortium. The vulnerability is due to an assertion failure when validating DNS response that contains multiple Resource Record sets. The vulnerability could be exploited by a remote attacker to cause a denial of service condition of the DNS server. In an attack case where the attacker is successful, the vulnerable named process will terminate and exit, creating a denial of service condition. The service needs to be restarted manually to restore the functionality. Users that rely on the affected server to resolve domain names will be unable to use most of Internet based applications.

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 ISC BIND DNSSEC Validation Multiple RRsets 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:  DNS Enforcement Violation.
Attack Information:  ISC BIND DNSSEC validation multiple RRsets denial of service

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