----------------------------------------------------------------------

Do you have VARM strategy implemented?

(Vulnerability Assessment Remediation Management)  

If not, then implement it through the most reliable vulnerability
intelligence source on the market. 

Implement it through Secunia. 

For more information visit:
http://secunia.com/advisories/business_solutions/

Alternatively request a call from a Secunia representative today to
discuss how we can help you with our capabilities contact us at:
sales@secunia.com

----------------------------------------------------------------------

TITLE:
Asterisk SIP Channel Driver Denial of Service

SECUNIA ADVISORY ID:
SA36227

VERIFY ADVISORY:
http://secunia.com/advisories/36227/

DESCRIPTION:
Some vulnerabilities have been reported in Asterisk, which can be
exploited by malicious people to cause a DoS (Denial of Service).

The vulnerabilities are caused due to "sscanf()" being invoked
without specifying a maximum width e.g. when processing SIP messages.
This can be exploited to exhaust stack memory in the SIP stack network
thread via overly long numeric strings in various fields of a
message.

NOTE: According to the vendor this is only potentially exploitable in
1.6.1 and above.

The vulnerabilities are reported in the following products and
versions:
* Asterisk Open Source 1.2.x versions prior to 1.2.34
* Asterisk Open Source 1.4.x versions prior to 1.4.26.1
* Asterisk Open Source 1.6.0.x versions prior to 1.6.0.12
* Asterisk Open Source 1.6.1.x versions prior to 1.6.1.4
* Asterisk Business Edition A.x.x versions
* Asterisk Business Edition versions prior to B.2.5.9
* Asterisk Business Edition C.2.x versions prior to C.2.4.1
* Asterisk Business Edition C.3.x versions prior to C.3.1
* s800i (Asterisk Appliance) 1.2.x versions prior to 1.3.0.3

SOLUTION:
Asterisk Open Source:
Update to version 1.2.34, 1.4.26.1, 1.6.0.12, or 1.6.1.4 or apply
patches.
http://downloads.digium.com/pub/security/AST-2009-005-1.2.diff.txt
http://downloads.digium.com/pub/security/AST-2009-005-1.4.diff.txt
http://downloads.digium.com/pub/security/AST-2009-005-trunk.diff.txt
http://downloads.digium.com/pub/security/AST-2009-005-1.6.0.diff.txt
http://downloads.digium.com/pub/security/AST-2009-005-1.6.1.diff.txt
http://downloads.digium.com/pub/security/AST-2009-005-1.6.2.diff.txt

Asterisk Business Edition:
Update to version B.2.5.9, C.2.4.1, or C.3.1.

s800i (Asterisk Appliance):
Update to version 1.3.0.3.

PROVIDED AND/OR DISCOVERED BY:
Mu Dynamics Research Team

ORIGINAL ADVISORY:
Asterisk:
http://downloads.asterisk.org/pub/security/AST-2009-005.html

Mu Dynamics Research Team:
http://labs.mudynamics.com/advisories/MU-200908-01.txt

----------------------------------------------------------------------

About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/advisories/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/advisories/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

----------------------------------------------------------------------