Check Point Advisories

Symantec Gateway Products DNS Cache Poisoning (CVE-2005-0817)

Check Point Reference: CPAI-2005-210
Date Published: 8 Aug 2010
Severity: High
Last Updated: Sunday 08 August, 2010
Source:
Industry Reference:CVE-2005-0817
Protection Provided by:

Security Gateway
R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description The Symantec Firewall has a DNS proxy service, DNSD.exe, that acts as a proxy and cache server for the DNS requests generated by internal systems. When the DNS proxy receives a DNS response from a DNS server, the information in the Authoritative and Additional Record will be saved in the DNS cache. There exists a vulnerability in the way the DNS proxy component of Symantec Gateway products processes and caches DNS responses. When the vulnerable component is configured to function as a DNS caching server or as a primary DNS server, it is susceptible to DNS cache poisoning under specific conditions. An attacker may exploit this vulnerability to do site spoofing, Man-in-the-Middle, or denial of service attacks by manipulating the DNS cache data on the target system. Upon receiving a specially crafted DNS response packet, the vulnerable Symantec Firewall DNS proxy service will cache invalid domain information in its cache without any verification, poisoning the cache. When a DNS request for the hijacked domain is made, information from the poisoned cache will be used to answer the request. Therefore, any client who utilizes this DNS Proxy service will be affected. This could be used to carry other types of attacks, such as man-in-the-middle attacks, or spoofing attacks, or information gathering attacks, etc.

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 Symantec Gateway Products DNS Cache Poisoning 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:  DNS Enforcement Violation.
Attack Information:  Symantec Gateway products DNS cache poisoning

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