Check Point Advisories

ISC DHCP dhclient script_write_params Stack Buffer Overflow (CVE-2009-0692)

Check Point Reference: CPAI-2009-406
Date Published: 3 Feb 2010
Severity: Critical
Last Updated: Wednesday 03 February, 2010
Source:
Industry Reference:CVE-2009-0692
Protection Provided by:

Security Gateway
R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description The Dynamic Host Configuration Protocol (DHCP) protocol is used to centrally manage and automate the assignment of IP addresses on a network. It is an extension of the BOOTP protocol. In addition to IP address assignment, DHCP clients receive from a DHCP server information that is required to manage their network configuration including the subnet net-mask, gateway address, DNS server addresses, and so on. DHCP uses UDP ports 67 and 68 for communication. There exists a stack buffer overflow vulnerability in ISC DHCP dhclient. The vulnerability is due to a boundary error in specially crafted DHCP responses sent from a server. Attackers in a network can exploit this vulnerability by running a malicious DHCP server, or by injecting malicious content in responses sent from an authentic server. A successful attack targeting this vulnerability could allow remote attackers to inject and execute arbitrary code on the vulnerable system within the security context of the root user. In an attack case where code execution is not successful, the affected application will terminate abnormally.

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 DHCP dhclient script_write_params Stack Buffer Overflow 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:  DHCP Protection Violation.
Attack Information:  ISC DHCP dhclient script_write_params stack buffer overflow

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