Check Point Advisories

Network Time Protocol Daemon peer xmit mode Denial of Service (CVE-2017-6464)

Vulnerability
Protection

Check Point Reference:	CPAI-2017-0411
Date Published:	11 May 2017
Severity:	Medium
Last Updated:	Sunday 28 May, 2017
Source:	Ntp.org
Industry Reference:	CVE-2017-6464
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	ntp.org NTP prior to 4.2.8p10
Vulnerability Description	A denial of service vulnerability exists in the Network Time Protocol daemon (NTPD). The vulnerability is due to a lack of input validation on the mode parameter in peer_xmit() when configuring ntp servers. A remote, authenticated attacker can exploit this vulnerability by sending a crafted packet to the target service.

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 / R75

In the IPS tab, click Protections and find the Network Time Protocol Daemon peer xmit mode Denial of Service protection using the Search tool and Edit the protection's settings.
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 peer xmit mode Denial of Service