Check Point Advisories

DNS MX Record Null Prefix (CVE-2010-0024)

Check Point Reference: SBP-2010-16
Date Published: 13 Apr 2010
Severity: Critical
Last Updated: Wednesday 28 June, 2017
Source:
Industry Reference:CVE-2010-0024
Protection Provided by:

Security Gateway
R81, R80, R77, R75, R71, R70, R65
Who is Vulnerable?
Vulnerability Description A denial of service vulnerability has been reported in the way that Microsoft Windows Simple Mail Transfer Protocol (SMTP) component handles specially crafted DNS Mail Exchanger (MX) resource records. The mail exchange (MX) resource record specifies a mail exchange server for a DNS domain name. A remote attacker may trigger this vulnerability via a specially crafted DNS request with a null prefix in the MX record. Successful exploitation of this issue could cause the affected system to stop accepting requests. Security Gateway: R70 VPN-1 Power/UTM: NGX R65 VPN-1 Power VSX: NGX R65

Protection Overview

This protection detects and blocks null prefix of DNS MX records.

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 / R71 / R70 / R65

  1. In the IPS tab, click Protections and find the DNS MX Record Null Prefix 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:  DNS MX record null prefix

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