Check Point Advisories

ISC BIND DNAME Response Processing Denial of Service (CVE-2016-8864)

Vulnerability
Protection

Check Point Reference:	CPAI-2016-1090
Date Published:	7 Dec 2016
Severity:	Medium
Last Updated:	Wednesday 05 July, 2017
Source:	ISC AA-01434
Industry Reference:	CVE-2016-8864
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	ISC BIND 9.0.x to 9.8.x ISC BIND 9.10.0 to 9.10.4-P3 ISC BIND 9.11.0 ISC BIND 9.9.0 to 9.9.9-P3 ISC BIND 9.9.3-S1 to 9.9.9-S5
Vulnerability Description	A denial of service vulnerability has been reported in ISC BIND. The vulnerability is due to a flaw processing recursive DNAME responses that can cause the target resolver to crash. A remote, unauthenticated attacker could exploit this vulnerability against DNS servers that perform recursive queries by providing responses with a crafted DNAME answer. Successful exploitation could lead to a denial-ofservice.

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 DNAME Response Processing 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 DNAME Response Processing Denial of Service