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Digium Asterisk SIP Channel Driver Denial of Service (CVE-2011-4063)

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Check Point Reference: CPAI-2012-021
Date Published:
Severity:
Source: Secunia Advisory: 46420
Industry Reference(s): CVE-2011-4063
Protection Provided by: Security Gateway
  • R75
Who is Vulnerable?
Digium Asterisk Open Source 1.8 prior to 1.8.7.1
Digium Asterisk Open Source 10.x
Vulnerability Description
A denial of service vulnerability has been reported in Digium Asterisk.
Vulnerability Details
The vulnerability is due to an error in Asterisk's SIP channel driver while handling malformed REGISTER requests. A remote attacker may exploit this vulnerability by sending a specially crafted REGISTER request to an affected Asterisk server. Successful exploitation could cause the application to crash, resulting in a denial of service condition.

Protection Overview
This protection will detect and block the transferring of a malicious SIP request.

In order for the protection to be activated, update your Security Gateway/VPN-1 product to the latest IPS/SmartDefense update. For information on how to update IPS/SmartDefense, go to SBP-2006-05, Protection tab and select the version of your choice.

To configure the defense, select your product from the list below and follow the related protection steps.

Security Gateway R75 / R71 / R70

How Can I Protect My Network?
1. In the IPS tab, click Protections and find the Digium Asterisk SIP Channel Driver Denial of Service protection using the Search tool and Edit the protection's settings.
2. Install policy on all modules.

How Do I Know if My Network is Under Attack?
SmartView Tracker will log the following entries:
Attack Name: VoIP Enforcement Violation
Attack Information: Digium Asterisk SIP channel driver denial of service