Date: 24 April 2012
References: ESB-2012.0411
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AUSCERT External Security Bulletin Redistribution
ESB-2012.0401
Asterisk Project Security Advisory - AST-2012-004
24 April 2012
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AusCERT Security Bulletin Summary
---------------------------------
Product: Asterisk
Publisher: Asterisk
Operating System: UNIX variants (UNIX, Linux, OSX)
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Denial of Service -- Existing Account
Unauthorised Access -- Existing Account
Resolution: Patch/Upgrade
Original Bulletin:
http://downloads.digium.com/pub/security/AST-2012-004.html
http://downloads.digium.com/pub/security/AST-2012-005.html
http://downloads.digium.com/pub/security/AST-2012-006.html
Comment: This bulletin contains three (3) Asterisk security advisories.
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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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Asterisk Project Security Advisory - AST-2012-005
Product Asterisk
Summary Heap Buffer Overflow in Skinny Channel Driver
Nature of Advisory Exploitable Heap Buffer Overflow
Susceptibility Remote Authenticated Sessions
Severity Minor
Exploits Known No
Reported On March 26, 2012
Reported By Russell Bryant
Posted On April 23, 2012
Last Updated On April 23, 2012
Advisory Contact Matt Jordan < mjordan AT digium DOT com >
CVE Name
Description In the Skinny channel driver, KEYPAD_BUTTON_MESSAGE events
are queued for processing in a buffer allocated on the
heap, where each DTMF value that is received is placed on
the end of the buffer. Since the length of the buffer is
never checked, an attacker could send sufficient
KEYPAD_BUTTON_MESSAGE events such that the buffer is
overrun.
Resolution The length of the buffer is now checked before appending a
value to the end of the buffer.
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
Corrected In
Product Release
Asterisk Open Source 1.6.2.24, 1.8.11.1, 10.3.1
Patches
SVN URL Revision
http://downloads.asterisk.org/pub/security/AST-2012-005-1.6.2.diff v1.6.2
http://downloads.asterisk.org/pub/security/AST-2012-005-1.8.diff v1.8
http://downloads.asterisk.org/pub/security/AST-2012-005-10.diff v10
Links https://issues.asterisk.org/jira/browse/ASTERISK-19592
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-2012-005.pdf and
http://downloads.digium.com/pub/security/AST-2012-005.html
Revision History
Date Editor Revisions Made
04/16/2012 Matt Jordan Initial Release
Asterisk Project Security Advisory - AST-2012-005
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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Asterisk Project Security Advisory - AST-2012-006
Product Asterisk
Summary Remote Crash Vulnerability in SIP Channel Driver
Nature of Advisory Remote Crash
Susceptibility Remote Authenticated Sessions
Severity Moderate
Exploits Known No
Reported On April 16, 2012
Reported By Thomas Arimont
Posted On April 23, 2012
Last Updated On April 23, 2012
Advisory Contact Matt Jordan < mjordan AT digium DOT com >
CVE Name
Description A remotely exploitable crash vulnerability exists in the
SIP channel driver if a SIP UPDATE request is processed
within a particular window of time. For this to occur, the
following must take place:
1. The setting 'trustrpid' must be set to True
2. An UPDATE request must be received after a call has been
terminated and the associated channel object has been
destroyed, but before the SIP dialog associated with the
call has been destroyed. Receiving the UPDATE request
before the call is terminated or after the SIP dialog
associated with the call will not cause the crash
vulnerability described here.
3. The UPDATE request must be formatted with the
appropriate headers to reflect an Asterisk connected line
update. The information in the headers must reflect a
different Caller ID then what was previously associated
with the dialog.
When these conditions are true, Asterisk will attempt to
perform a connected line update with no associated channel,
and will crash.
Resolution Asterisk now ensures a channel exists before performing a
connected line update, when that connected line update is
initiated via a SIP UPDATE request.
In Asterisk versions not containing the fix for this issue,
setting the 'trustrpid' setting to False will prevent this
crash from occurring (default is False)
Affected Versions
Product Release Series
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 1.8.11.1, 10.3.1
Asterisk Business Edition C.3.7.4
Patches
SVN URL Revision
http://downloads.asterisk.org/pub/security/AST-2012-006-1.8.diff v1.8
http://downloads.asterisk.org/pub/security/AST-2012-006-10.diff v.10
Links https://issues.asterisk.org/jira/browse/ASTERISK-19770
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-2012-006.pdf and
http://downloads.digium.com/pub/security/AST-2012-006.html
Revision History
Date Editor Revisions Made
04/16/2012 Matt Jordan Initial release.
Asterisk Project Security Advisory - AST-2012-006
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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