Check Point Advisories

PowerDNS Authoritative Server Dot Character Denial of Service (CVE-2016-5427)

Check Point Reference: CPAI-2016-0969
Date Published: 8 Jan 2017
Severity: Medium
Last Updated: 31 Jan 2018
Source: PowerDNS
Industry Reference:CVE-2016-5427
Protection Provided by:

Security Gateway
R80, R77, R76, R75

Who is Vulnerable? PowerDNS Authoritative Server 3.x prior to 3.4.10
Vulnerability Description A denial-of-service vulnerability exists in PowerDNS Authoritative Server. The vulnerability is due to an error in processing queries with the dot character inside. A remote, unauthenticated attacker can exploit this vulnerability by sending a specially crafted DNS packet to the target application that could lead to excessive resources being consumed, resulting in a denial of service condition.

Protection Overview

This protection detects 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 / R76 / R75

  1. In the IPS tab, click Protections and find the PowerDNS Authoritative Server Dot Character Denial of Service protection using the Search tool and Edit the protection's settings.
  2. Install policy on all modules.

This protection's log will contain the following information:

Attack Name:  DNS Enforcement Violation.
Attack Information:  PowerDNS Authoritative Server Dot Character Denial of Service

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