Check Point Advisories

ISC BIND RRSIG Record Response Assertion Failure Denial of Service (CVE-2016-9147)

Vulnerability
Protection

Check Point Reference:	CPAI-2017-0199
Date Published:	7 Mar 2017
Severity:	Medium
Last Updated:	Wednesday 22 March, 2017
Source:	ISC AA-01440
Industry Reference:	CVE-2016-9147
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	ISC BIND 9.10.4-P4 ISC BIND 9.11.0-P1 ISC BIND 9.9.9-P4 ISC BIND 9.9.9-S6
Vulnerability Description	A denial-of-service vulnerability has been reported in ISC BIND. The vulnerability is due to a defect that can cause named service to exit with an assertion failure while processing a crafted DNS response packet containing malformed RRSIG record. A remote, unauthenticated attacker could exploit this vulnerability by providing a specially crafted response to the vulnerable server.

Protection Overview

This protection detects 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 Record Response Assertion Failure 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 Record Response Assertion Failure Denial of Service