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AUSCERT External Security Bulletin Redistribution
ESB-2011.0597
Asterisk Project Security Advisory - AST-2011-007
3 June 2011
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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:
http://downloads.asterisk.org/pub/security/AST-2011-007.html
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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
Description
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.
Resolution
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
strings.
Affected Versions
Product Asterisk Open Source
Release Series 1.8.x All versions
Corrected In
Product Asterisk Open Source
Release 1.8.4.2
Patches
URL Http://downloads.asterisk.org/pub/security/AST-2011-007-1.8.diff
Branch 1.8
Asterisk Project Security Advisories are posted at
http://www.asterisk.org/security
This document may be superseded by later versions; if so, the latest version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
http://downloads.digium.com/pub/security/AST-2011-007.html
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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