Check Point Advisories

ISC DHCP Server Packet Processing Denial of Service (CVE-2011-2748)

Vulnerability
Protection

Check Point Reference:	CPAI-2011-427
Date Published:	6 Dec 2011
Severity:	High
Last Updated:	Tuesday 06 December, 2011
Source:
Industry Reference:	CVE-2011-2748
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description	A denial of service vulnerability has been reported in ISC DHCP server. The vulnerability is due to an error while processing specially crafted packets. A remote attacker may exploit this vulnerability by sending a malicious request to an affected DHCP server. Successful exploitation of this vulnerability would terminate the DHCP server process and result in a denial of service condition.

Protection Overview

This protection detects and blocks malicious requests sent to the server.

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 DHCP Server Packet 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: DHCP Protection Violation.
Attack Information: ISC DHCP server packet processing denial of service