Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2013.0019
Asterisk Project Security Advisory - AST-2012-014 & AST-2012-015
8 January 2013
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Asterisk Open Source
Certified Asterisk
Asterisk Digiumphones
Publisher: Asterisk
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2012-5977 CVE-2012-5976
Original Bulletin:
http://downloads.digium.com/pub/security/AST-2012-014.html
http://downloads.digium.com/pub/security/AST-2012-015.html
Comment: This bulletin contains two (2) Asterisk security advisories.
- --------------------------BEGIN INCLUDED TEXT--------------------
Asterisk Project Security Advisory - AST-2012-014
Product Asterisk
Summary Crashes due to large stack allocations when using
TCP
Nature of Advisory Stack Overflow
Susceptibility Remote Unauthenticated Sessions (SIP)
Remote Authenticated Sessions (XMPP, HTTP)
Severity Critical
Exploits Known No
Reported On 7 November, 2012
Reported By Walter Doekes
Posted On 2 January, 2013
Last Updated On January 2, 2013
Advisory Contact Mark Michelson <mmichelson AT digium DOT com>
CVE Name CVE-2012-5976
Description Asterisk has several places where messages received over
various network transports may be copied in a single stack
allocation. In the case of TCP, since multiple packets in a
stream may be concatenated together, this can lead to large
allocations that overflow the stack.
In the case of SIP, it is possible to do this before a
session is established. Keep in mind that SIP over UDP is
not affected by this vulnerability.
With HTTP and XMPP, a session must first be established
before the vulnerability may be exploited. The XMPP
vulnerability exists both in the res_jabber.so module in
Asterisk 1.8, 10, and 11 as well as the res_xmpp.so module
in Asterisk 11.
Resolution Stack allocations when using TCP have either been eliminated
in favor of heap allocations or have had an upper bound
placed on them to ensure that the stack will not overflow.
For SIP, the allocation now has an upper limit.
For HTTP, the allocation is now a heap allocation instead of
a stack allocation.
For XMPP, the allocation has been eliminated since it was
unnecessary.
Affected Versions
Product Release Series
Asterisk Open Source 1.8.x All versions
Asterisk Open Source 10.x All versions
Asterisk Open Source 11.x All versions
Certified Asterisk 1.8.11 SIP: unaffected
HTTP and XMPP: All versions
Asterisk Digiumphones 10.x-digiumphones All versions
Corrected In
Product Release
Asterisk Open Source 1.8.19.1, 10.11.1, 11.1.1
Certified Asterisk 1.8.11-cert10
Asterisk Digiumphones 10.11.1-digiumphones
Patches
SVN URL Revision
http://downloads.asterisk.org/pub/security/AST-2012-014-1.8.diff Asterisk
1.8
http://downloads.asterisk.org/pub/security/AST-2012-014-10.diff Asterisk
10
http://downloads.asterisk.org/pub/security/AST-2012-014-11.diff Asterisk
11
Links https://issues.asterisk.org/jira/browse/ASTERISK-20658
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-2012-014.pdf and
http://downloads.digium.com/pub/security/AST-2012-014.html
Revision History
Date Editor Revisions Made
19 November, 2012 Mark Michelson Initial Draft
02 January, 2013 Matt Jordan Removed ABE from affected products
Asterisk Project Security Advisory - AST-2012-014
Copyright (c) 2012 Digium, Inc. All Rights Reserved.
Permission is hereby granted to distribute and publish this advisory in its
original, unaltered form.
- ------------------------------------------------------------------------------
Asterisk Project Security Advisory - AST-2012-015
Product Asterisk
Summary Denial of Service Through Exploitation of Device
State Caching
Nature of Advisory Denial of Service
Susceptibility Remote Unauthenticated Sessions
Severity Critical
Exploits Known None
Reported On 26 July, 2012
Reported By Russell Bryant
Posted On 2 January, 2013
Last Updated On January 2, 2013
Advisory Contact Matt Jordan <mjordan AT digium DOT com>
CVE Name CVE-2012-5977
Description Asterisk maintains an internal cache for devices. The
device state cache holds the state of each device known to
Asterisk, such that consumers of device state information
can query for the last known state for a particular device,
even if it is not part of an active call. The concept of a
device in Asterisk can include things that do not have a
physical representation. One way that this currently occurs
is when anonymous calls are allowed in Asterisk. A device
is automatically created and stored in the cache for each
anonymous call that occurs; this is possible in the SIP and
IAX2 channel drivers and through channel drivers that
utilize the res_jabber/res_xmpp resource modules (Gtalk,
Jingle, and Motif). Attackers exploiting this vulnerability
can attack an Asterisk system configured to allow anonymous
calls by varying the source of the anonymous call,
continually adding devices to the device state cache and
consuming a system's resources.
Resolution Channels that are not associated with a physical device are
no longer stored in the device state cache. This affects
Local, DAHDI, SIP and IAX2 channels, and any channel drivers
built on the res_jabber/res_xmpp resource modules (Gtalk,
Jingle, and Motif).
Affected Versions
Product Release Series
Asterisk Open Source 1.8.x All Versions
Asterisk Open Source 10.x All Versions
Asterisk Open Source 11.x All Versions
Certified Asterisk 1.8.11 All Versions
Asterisk Digiumphones 10.x-digiumphones All Versions
Corrected In
Product Release
Asterisk Open Source 1.8.19.1, 10.11.1, 11.1.1
Certified Asterisk 1.8.11-cert10
Asterisk Digiumphones 10.11.1-digiumphones
Patches
SVN URL Revision
http://downloads.asterisk.org/pub/security/AST-2012-015-1.8.diff Asterisk
1.8
http://downloads.asterisk.org/pub/security/AST-2012-015-10.diff Asterisk
10
http://downloads.asterisk.org/pub/security/AST-2012-015-11.diff Asterisk
11
Links https://issues.asterisk.org/jira/browse/ASTERISK-20175
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-2012-015.pdf and
http://downloads.digium.com/pub/security/AST-2012-015.html
Revision History
Date Editor Revisions Made
19 November 2012 Matt Jordan Initial Draft
Asterisk Project Security Advisory - AST-2012-015
Copyright (c) 2012 Digium, Inc. All Rights Reserved.
Permission is hereby granted to distribute and publish this advisory in its
original, unaltered form.
- --------------------------END INCLUDED TEXT--------------------
You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
http://www.auscert.org.au/render.html?cid=1980
===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967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=mDvW
-----END PGP SIGNATURE-----