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             AUSCERT External Security Bulletin Redistribution

             Asterisk Project Security Advisory - AST-2011-007
                                3 June 2011


        AusCERT Security Bulletin Summary

Product:           Asterisk 1.8.x
Publisher:         Asterisk
Operating System:  UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2011-2216  

Original Bulletin: 

- --------------------------BEGIN INCLUDED TEXT--------------------

Asterisk Project Security Advisory - AST-2011-007

Product			Asterisk
Summary			Remote Crash Vulnerability in SIP channel driver
Nature of Advisory	Remote attacker can crash an Asterisk server
Susceptibility		Remote Authenticated Sessions
Severity		Moderate
Exploits Known		No
Reported On		May 23, 2011
Reported By		Jonathan Rose jrose@digium.com
Posted On		June 02, 2011
Last Updated On		June 02, 2011
Advisory Contact	Jonathan Rose jrose@digium.com
CVE Name		CVE-2011-2216


If a remote user initiates a SIP call and the recipient picks up, the remote 
user can reply with a malformed Contact header that Asterisk will improperly 
handle and cause a crash due to a segmentation fault.

Asterisk now immediately initializes buffer strings coming into the 
parse_uri_full function to prevent outside functions from receiving a NULL 
value pointer. This should increase the safety of any function that uses 
parse_uri or its wrapper functions which previously would attempt to work in 
the presence of a parse_uri failure by reading off of potentially uninitialized 

Affected Versions

Product 	Asterisk Open Source
Release Series 	1.8.x All versions

Corrected In	

Product		Asterisk Open Source


URL		Http://downloads.asterisk.org/pub/security/AST-2011-007-1.8.diff
Branch		1.8

Asterisk Project Security Advisories are posted at 

This document may be superseded by later versions; if so, the latest version 
will be posted at http://downloads.digium.com/pub/security/AST-2011-007.pdf and 

Revision History

Date		06/02/11
Editor		Jonathan Rose
Revisions Made	Initial Release

Asterisk Project Security Advisory - AST-2011-007
Copyright  2011 Digium, Inc. All Rights Reserved.
Permission is hereby granted to distribute and publish this advisory in its 
original, unaltered form.

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