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Asterisk Project Security Advisory - AST-2014-008

Product Asterisk
Summary Denial of Service in PJSIP Channel Driver
Subscriptions
Nature of Advisory Denial of Service
Susceptibility Remote authenticated sessions
Severity Moderate
Exploits Known No
Reported On 28 May, 2014
Reported By Mark Michelson
Posted On June 12, 2014
Last Updated On June 12, 2014
Advisory Contact Mark Michelson <mmichelson AT digium DOT com>
CVE Name CVE-2014-4048

Description When a SIP transaction timeout caused a subscription to be
terminated, the action taken by Asterisk was guaranteed to
deadlock the thread on which SIP requests are serviced.

Note that this behavior could only happen on established
subscriptions, meaning that this could only be exploited if
an attacker bypassed authentication and successfully
subscribed to a real resource on the Asterisk server.

Resolution The socket-servicing thread is now no longer capable of
dispatching synchronous tasks to other threads since that
may result in deadlocks.

Affected Versions
Product Release Series
Asterisk Open Source 12.x All versions

Corrected In
Product Release
Asterisk Open Source 12.3.1

Patches
SVN URL Revision
http://downloads.asterisk.org/pub/security/AST-2014-008-12.diff Asterisk
12

Links https://issues.asterisk.org/jira/browse/ASTERISK-23802

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This document may be superseded by later versions; if so, the latest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-2014-008.pdf and
http://downloads.digium.com/pub/security/AST-2014-008.html

Revision History
Date Editor Revisions Made
June 6, 2014 Mark Michelson Document Creation
June 12, 2014 Matt Jordan Added CVE

Asterisk Project Security Advisory - AST-2014-008
Copyright (c) 2014 Digium, Inc. All Rights Reserved.
Permission is hereby granted to distribute and publish this advisory in its
original, unaltered form.


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