Check Point Advisories

Network Time Protocol Windows Daemon getEndptFromIoCtx Denial of Service (CVE-2016-9312)

Vulnerability
Protection

Check Point Reference:	CPAI-2017-0016
Date Published:	10 Jan 2017
Severity:	Medium
Last Updated:	Tuesday 10 January, 2017
Source:	Network Time Foundation Sec 3110
Industry Reference:	CVE-2016-9312
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	ntp.org NTP prior to 4.2.8p9
Vulnerability Description	A denial of service vulnerability has been reported in the Windows port of Network Time Foundation's NTP Daemon. The vulnerability is due to insufficient error handling when receiving large UDP packets. A remote, unauthenticated attacker can exploit this vulnerability by sending a large UDP packet to the target server.

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

In the IPS tab, click Protections and find the Network Time Protocol Windows Daemon getEndptFromIoCtx 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 Windows Daemon getEndptFromIoCtx Denial of Service