Asterisk Project Security Advisory - AST-2012-004
Product Asterisk
Summary Asterisk Manager User Unauthorized Shell Access
Nature of Advisory Permission Escalation
Susceptibility Remote Authenticated Sessions
Severity Minor
Exploits Known No
Reported On February 23, 2011
Reported By David Woolley
Posted On April 23, 2012
Last Updated On April 23, 2012
Advisory Contact Jonathan Rose < jrose AT digium DOT com >
CVE Name
Description A user of the Asterisk Manager Interface can bypass a
security check and execute shell commands when they lack
permission to do so. Under normal conditions, a user should
only be able to run shell commands if that user has System
class authorization. Users could bypass this restriction by
using the MixMonitor application with the originate action
or by using either the GetVar or Status manager actions in
combination with the SHELL and EVAL functions. The patch
adds checks in each affected action to verify if a user has
System class authorization. If the user does not have those
authorizations, Asterisk rejects the action if it detects
the use of any functions or applications that run system
commands.
Resolution Asterisk now performs checks against manager commands that
cause these behaviors for each of the affected actions.
Affected Versions
Product Release Series
Asterisk Open Source 1.6.2.x All versions
Asterisk Open Source 1.8.x All versions
Asterisk Open Source 10.x All versions
Asterisk Business Edition C.3.x All versions
Corrected In
Product Release
Asterisk Open Source 1.6.2.24, 1.8.11.1, 10.3.1
Asterisk Business Edition C.3.7.4
Patches
SVN URL Revision
http://downloads.asterisk.org/pub/security/AST-2012-004-1.6.2.diff v1.6.2
http://downloads.asterisk.org/pub/security/AST-2012-004-1.8.diff v1.8
http://downloads.asterisk.org/pub/security/AST-2012-004-10.diff v10
Links https://issues.asterisk.org/jira/browse/ASTERISK-17465
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This document may be superseded by later versions; if so, the latest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-2012-004.pdf and
http://downloads.digium.com/pub/security/AST-2012-004.html
Revision History
Date Editor Revisions Made
04/23/2012 Jonathan Rose Initial Release
Asterisk Project Security Advisory - AST-2012-004
Copyright (c) 2012 Digium, Inc. All Rights Reserved.
Permission is hereby granted to distribute and publish this advisory in its
original, unaltered form.
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