Check Point Advisories

Samba DNS Reply Flag Denial of Service (CVE-2014-0239)

Check Point Reference: CPAI-2014-1921
Date Published: 3 Aug 2014
Severity: High
Last Updated: Tuesday 19 April, 2016
Source:
Industry Reference:CVE-2014-0239
Protection Provided by:

Security Gateway
R81, R80, R77, R75

Who is Vulnerable? Samba Team Samba 4.0.x prior to 4.0.18,
Samba Team Samba 4.1.x prior to 4.1.8.
Vulnerability Description A denial of service vulnerability exists in Samba DNS server. The server fails to check the reply flag of DNS packets, making it vulnerable to reply to a spoofed reply. This could result in a "ping-pong" type attack where two vulnerable servers attack each other. Successful exploitation could result in excessive consumption of resources on both vulnerable servers, possibly causing a denial of service condition.

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 Samba DNS Reply Flag Denial of Service 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:  Samba DNS Reply Flag Denial of Service

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