Check Point Advisories

Digium Asterisk HTTP Connections Denial of Service (CVE-2014-4047)

Vulnerability
Protection

Check Point Reference:	CPAI-2014-1891
Date Published:	23 Oct 2014
Severity:	Medium
Last Updated:	Monday 15 August, 2016
Source:	Digium AST-2014-007
Industry Reference:	CVE-2014-4047
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	Asterisk Asterisk Open Source prior to 1.8.28.1 Asterisk Asterisk Open Source prior to 11.10.1 Asterisk Asterisk Open Source prior to 12.3.1 Asterisk Certified Asterisk prior to 1.8.15-cert6 Asterisk Certified Asterisk prior to 11.6-cert3
Vulnerability Description	A denial of service vulnerability exists in Digium Asterisk. The vulnerability is due to the way HTTP sessions are being handled. A remote, unauthenticated attacker can exploit this vulnerability by establishing an excessive number of TCP connections to the configured HTTP or HTTPS port.

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 Digium Asterisk HTTP Connections 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: VoIP Enforcement Violation.
Attack Information: Digium Asterisk HTTP Connections Denial of Service