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NTP Servers Monlist Command Denial of Service (CVE-2013-5211)


Check Point Reference: CPAI-2014-0750
Date Published:
Source: IPS Research Team
Industry Reference(s): CVE-2013-5211
Protection Provided by: Security Gateway
  • R75
Who is Vulnerable?
NTP servers prior to version 4.2.7p26
Vulnerability Description
There exists a design flaw in NTP servers that can allow attackers to perform DoS attacks against target machines. A remote attacker can leverage this flaw by sending a specially crafted request to an affected NTP server.

Protection Overview
This protection will detect and block the transferring of specially crafted requests to the server.

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, Protection tab and select the version of your choice.

To configure the defense, select your product from the list below and follow the related protection steps.

Security Gateway R75 / R71 / R70

How Can I Protect My Network?

  1. In the IPS tab, click Protections and find the NTP Servers Monlist Command Denial of Service protection using the Search tool and Edit the protection's settings.
  2. Install policy on all modules.

How Do I Know if My Network is Under Attack?
SmartView Tracker will log the following entries:
Attack Name: NTP Enforcement Violation
Attack Information: NTP Servers Monlist Command Denial of Service