AST-2012-013: ACL Rules Ignored When Placing Outbound Calls By Certain IAX2 Users

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Asterisk Project Security Advisory – AST-2012-013

Product Asterisk
Summary ACL rules ignored when placing outbound calls by
certain IAX2 users
Nature of Advisory Unauthorized use of system
Susceptibility Remote Authenticated Sessions
Severity Moderate
Exploits Known None
Reported On 07/27/2012
Reported By Alan Frisch
Posted On 08/30/2012
Last Updated On August 30, 2012
Advisory Contact Matt Jordan < mjordan AT digium DOT com >
CVE Name CVE-2012-4737

Description When an IAX2 call is made using the credentials of a peer
defined in a dynamic Asterisk Realtime Architecture (ARA)
backend, the ACL rules for that peer are not applied to the
call attempt. This allows for a remote attacker who is
aware of a peer’s credentials to bypass the ACL rules set
for that peer.

Resolution The ACL rules for peers defined in an ARA backend are now
honored. Users of chan_iax2 should upgrade to the corrected
versions; apply a provided patch; or define their IAX2 peers
outside of an ARA backend in a static configuration file.

Affected Versions
Product Release Series
Asterisk Open Source 1.8.x All versions
Asterisk Open Source 10.x All versions
Certified Asterisk 1.8.11 All versions
Asterisk Digiumphones 10.x.x-digiumphones All versions
Asterisk Business Edition C.3.x All versions

Corrected In
Product Release
Asterisk Open Source 1.8.15.1, 10.7.1
Certified Asterisk 1.8.11-cert7
Asterisk Digiumphones 10.7.1-digiumphones
Asterisk Business Edition C.3.7.6

Patches
SVN URL Revision
http://downloads.asterisk.org/pub/security/AST-2012-013.1.8.diff Asterisk
1.8
http://downloads.asterisk.org/pub/security/AST-2012-013.10.diff Asterisk
10

Links https://issues.asterisk.org/jira/browse/ASTERISK-20186

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This document may be superseded by later versions; if so, the latest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-2012-013.pdf and
http://downloads.digium.com/pub/security/AST-2012-013.html

Revision History
Date Editor Revisions Made
08/27/2012 Matt Jordan Initial Revision

Asterisk Project Security Advisory – AST-2012-013
Copyright (c) 2012 Digium, Inc. All Rights Reserved.
Permission is hereby granted to distribute and publish this advisory in its
original, unaltered form.