AST-2014-014: High call load may result in hung channels in ConfBridge. Nov 21 2014 12:15AM
Asterisk Security Team (security asterisk org)
Asterisk Project Security Advisory - AST-2014-014

Product Asterisk
Summary High call load may result in hung channels in
Nature of Advisory Denial of Service
Susceptibility Remote Unauthenticated Sessions
Severity Moderate
Exploits Known No
Reported On 19 October, 2014
Reported By Ben Klang
Posted On 20 November 2014
Last Updated On November 20, 2014
Advisory Contact Joshua Colp <jcolp AT digium DOT com>
CVE Name Pending

Description The ConfBridge application uses an internal bridging API to
implement conference bridges. This internal API uses a
state model for channels within the conference bridge and
transitions between states as different things occur. Under
load it is possible for some state transitions to be
delayed causing the channel to transition from being hung
up to waiting for media. As the channel has been hung up
remotely no further media will arrive and the channel will
stay within ConfBridge indefinitely.

Resolution The underlying bridging code that ConfBridge uses has been
fixed so state changes can not occur that will take a
channel out of the hung up state.

Affected Versions
Product Release
Asterisk Open Source 11.x All versions
Certified Asterisk 11.6 All versions

Corrected In
Product Release
Asterisk Open Source 11.14.1
Certified Asterisk 11.6-cert8

SVN URL Revision
http://downloads.asterisk.org/pub/security/AST-2014-014-11.diff Asterisk
http://downloads.asterisk.org/pub/security/AST-2014-014-11.6.diff Certified

Links https://issues.asterisk.org/jira/browse/ASTERISK-24440

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This document may be superseded by later versions; if so, the latest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-2014-014.pdf and

Revision History
Date Editor Revisions Made
20 November, 2014 Joshua Colp Initial Advisory created

Asterisk Project Security Advisory - AST-2014-014
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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