Check Point Advisories

Network Time Protocol Daemon crypto-NAK Denial of Service (CVE-2016-4957)

Check Point Reference: CPAI-2016-0565
Date Published: 5 Jul 2016
Severity: Medium
Last Updated: Monday 29 August, 2016
Source: Ntp.org
Industry Reference:CVE-2016-4957
Protection Provided by:

Security Gateway
R81, R80, R77, R75
Who is Vulnerable? ntp.org NTP 4.2.8p7
ntp.org NTP 4.3.92
Vulnerability Description A denial of service vulnerability exists in the Network Time Protocol daemon (NTPD). The vulnerability is due to a null pointer dereference when handling crypto-NAK packets. A remote attacker can exploit this vulnerability by sending an unsolicited crypto-NAK packet to the target service.

Protection Overview

This protection will 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 / R75

  1. In the IPS tab, click Protections and find the Network Time Protocol Daemon crypto-NAK 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:  NTP Enforcement Violation.
Attack Information:  Network Time Protocol Daemon crypto-NAK Denial of Service

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