Date: 30 May 2012
References: ESB-2012.0548
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AUSCERT External Security Bulletin Redistribution
ESB-2012.0503
A number of vulnerabilities have been identified in Asterisk
30 May 2012
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AusCERT Security Bulletin Summary
---------------------------------
Product: Certified Asterisk
Asterisk Open Source
Publisher: Digium
Operating System: UNIX variants (UNIX, Linux, OSX)
Impact/Access: Denial of Service -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2012-2948 CVE-2012-2947
Original Bulletin:
http://downloads.asterisk.org/pub/security/AST-2012-007.html
http://downloads.asterisk.org/pub/security/AST-2012-008.html
Comment: This bulletin contains two (2) Digium security advisories.
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Asterisk Project Security Advisory - AST-2012-007
Product Asterisk
Summary Remote crash vulnerability in IAX2 channel driver.
Nature of Advisory Remote crash
Susceptibility Established calls
Severity Moderate
Exploits Known No
Reported On March 21, 2012
Reported By mgrobecker
Posted On May 29, 2012
Last Updated On May 29, 2012
Advisory Contact Richard Mudgett < rmudgett AT digium DOT com >
CVE Name CVE-2012-2947
Description
A remotely exploitable crash vulnerability exists in the IAX2 channel driver if
an established call is placed on hold without a suggested music class. For this
to occur, the following must take place:
1. The setting mohinterpret=passthrough must be set on the end placing the call
on hold.
2. A call must be established.
3. The call is placed on hold without a suggested music-on-hold class name.
When these conditions are true, Asterisk will attempt to use an invalid pointer
to a music-on-hold class name. Use of the invalid pointer will either cause a
crash or the music-on-hold class name will be garbage.
Resolution
Asterisk now sets the extra data parameter to null if the received control
frame does not have any extra data.
Affected Versions
Product Release Series
Certified Asterisk 1.8.11-cert All versions
Asterisk Open Source 1.8.x All versions
Asterisk Open Source 10.x All versions
Corrected In
Product Release
Certified Asterisk 1.8.11-cert2
Asterisk Open Source 1.8.12.1, 10.4.1
Patches
SVN URL Revision
http://downloads.asterisk.org/pub/security/AST-2012-007-1.8.11-cert.diff v1.8.11-cert
http://downloads.asterisk.org/pub/security/AST-2012-007-1.8.diff v1.8
http://downloads.asterisk.org/pub/security/AST-2012-007-10.diff v10
Links
https://issues.asterisk.org/jira/browse/ASTERISK-19597
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-2012-007.pdf
and http://downloads.digium.com/pub/security/AST-2012-007.html
Revision History
Date Editor Revisions Made
05/29/2012 Richard Mudgett Initial release.
Asterisk Project Security Advisory - AST-2012-007
Copyright 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-2012-008
Product Asterisk
Summary Skinny Channel Driver Remote Crash Vulnerability
Nature of Advisory Denial of Service
Susceptibility Remote authenticated sessions
Severity Minor
Exploits Known No
Reported On May 22, 2012
Reported By Christoph Hebeisen
Posted On May 29, 2012
Last Updated On May 29, 2012
Advisory Contact Matt Jordan < mjordan AT digium DOT com >
CVE Name CVE-2012-2948
Description
As reported by Telus Labs:
"A Null-pointer dereference has been identified in the SCCP (Skinny) channel
driver of Asterisk. When an SCCP client closes its connection to the server,
a pointer in a structure is set to Null. If the client was not in the on-hook
state at the time the connection was closed, this pointer is later
dereferenced.
A remote attacker with a valid SCCP ID can can use this vulnerability by
closing a connection to the Asterisk server in certain call states (e.g.
"Off hook") to crash the server. Successful exploitation of this vulnerability
would result in termination of the server, causing denial of service to
legitimate users.
Resolution
The pointer to the device in the structure is now checked before it is
dereferenced in the channel event callbacks and message handling functions.
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-cert 1.8.11-cert1
Corrected In
Product Release
Asterisk Open Source 1.8.12.1, 10.4.1
Certified Asterisk 1.8.11-cert2
Patches
SVN URL Revision
http://downloads.asterisk.org/pub/security/AST-2012-008-1.8.diff v1.8
http://downloads.asterisk.org/pub/security/AST-2012-008-10.diff v10
http://downloads.asterisk.org/pub/security/AST-2012-008-1.8.11-cert.diff v1.8.11-cert
Links
https://issues.asterisk.org/jira/browse/ASTERISK-19905
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-2012-008.pdf
and http://downloads.digium.com/pub/security/AST-2012-008.html
Revision History
Date Editor Revisions Made
05/25/2012 Matt Jordan Initial Release
Asterisk Project Security Advisory - AST-2012-008
Copyright 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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