Digium Asterisk Skinny Channel NULL-Pointer Dereference (CVE-2012-2948)
|Check Point Reference:||CPAI-2012-312|
|Source:||Asterisk Project Security Advisory: AST-2012-008|
|Protection Provided by:||
Who is Vulnerable?
Digium Asterisk Open Source 1.8 prior to 126.96.36.199
Digium Asterisk Open Source 10 prior to 10.4.1
A denial of service vulnerability has been reported in Digium Asterisk.
The vulnerability is due to a NULL-pointer dereference error while handling a closed client connection in the SCCP (Skinny) channel driver. A remote attacker can exploit this vulnerability by closing a connection to the Asterisk server in certain call states. The attacker will have to use a valid SCCP ID to close the connection. Successful exploitation would cause the server to crash, resulting in a denial of service condition.
This protection will detect and block attempts to exploit this vulnerability.
In order for the protection to be activated, update your product to the latest update. For information on how to update , 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?
- In the IPS tab, click Protections and find the Digium Asterisk Skinny Channel NULL-Pointer Dereference protection using the Search tool and Edit the protection's settings.
- 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 Skinny Channel NULL-Pointer Dereference