AST-2011-006: Asterisk Manager User Shell Access



Asterisk Project Security Advisory - AST-2011-006

Product Asterisk
Summary Asterisk Manager User Shell Access
Nature of Advisory Permission Escalation
Susceptibility Remote Authenticated Sessions
Severity Minor
Exploits Known Yes
Reported On February 10, 2011
Reported By Mark Murawski <markm AT intellasoft DOT net>
Posted On April 21, 2011
Last Updated On April 21, 2011
Advisory Contact Matthew Nicholson <mnicholson@xxxxxxxxxx>
CVE Name

Description It is possible for a user of the Asterisk Manager Interface to
bypass a security check and execute shell commands when they
should not have that ability. Sending the "Async" header with
the "Application" header during an Originate action, allows
authenticated manager users to execute shell commands. Only
users with the "system" privilege should be able to do this.

Resolution Asterisk now performs the proper access check where appropriate
during the originate manager action.

Affected Versions
Product Release Series
Asterisk Open Source 1.4.x All versions
Asterisk Open Source 1.6.1.x All versions
Asterisk Open Source 1.6.2.x All versions
Asterisk Open Source 1.8.x All versions
Asterisk Business Edition C.x.x All versions

Corrected In
Product Release
Asterisk Open Source 1.4.40.1, 1.6.1.25, 1.6.2.17.3, 1.8.3.3
Asterisk Business Edition C.3.6.4

Patches
URL Branch
http://downloads.asterisk.org/pub/security/AST-2011-006-1.4.diff 1.4
http://downloads.asterisk.org/pub/security/AST-2011-006-1.6.1.diff 1.6.1
http://downloads.asterisk.org/pub/security/AST-2011-006-1.6.2.diff 1.6.2
http://downloads.asterisk.org/pub/security/AST-2011-006-1.8.diff 1.8

Links

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This document may be superseded by later versions; if so, the latest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-2011-006.pdf and
http://downloads.digium.com/pub/security/AST-2011-006.html

Revision History
Date Editor Revisions Made
4/21/11 Matthew Nicholson Initial version

Asterisk Project Security Advisory - AST-2011-006
Copyright (c) 2011 Digium, Inc. All Rights Reserved.
Permission is hereby granted to distribute and publish this advisory in its
original, unaltered form.