Check Point Advisories

Dnsmasq Malicious BLKSIZE Option NULL Dereference Denial of Service (CVE-2009-2958)

Vulnerability
Protection

Check Point Reference:	CPAI-2015-0355
Date Published:	26 Mar 2015
Severity:	Medium
Last Updated:	Wednesday 27 January, 2021
Source:
Industry Reference:	CVE-2009-2958
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description	A denial-of-service vulnerability has been reported in Thekelleys Dnsmasq. The vulnerability is due to a NULL pointer dereference in the tftp_request() function inside src/ftpd.c. Successful exploitation of this vulnerability would allow a remote attacker to create a denial of service condition on the affected system.

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 R81 / R80 / R77 / R75

In the IPS tab, click Protections and find the Dnsmasq Malicious BLKSIZE Option NULL Dereference 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: Dnsmasq Malicious BLKSIZE Option NULL Dereference Denial of Service