Check Point Advisories

Multiple Vendors NTP Mode 7 Denial of Service (CVE-2009-3563)

Vulnerability
Protection

Check Point Reference:	CPAI-2009-470
Date Published:	2 Feb 2010
Severity:	High
Last Updated:	Thursday 05 November, 2015
Source:
Industry Reference:	CVE-2009-3563
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description	The ntpd daemon implements the Network Time Protocol (NTP) which sets and maintains the system time-of-day in synchronism with Internet standard time servers or other local reference clocks. NTP.org maintains the reference implementation of ntpd that is used by multiple vendors. A denial of service vulnerability exists in NTP. The vulnerability is due to an incorrect handling of mode 7 requests. A remote unauthenticated attacker can exploit this vulnerability by sending a maliciously crafted request to a target NTP server. A successful attack can lead to a resource exhaustion and, ultimately, a denial of service condition of the affected service on a target system.

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 Multiple Vendors NTP Mode 7 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: Multiple vendors NTP mode 7 denial of service