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Asterisk Project Security Advisory - AST-2017-008

Asterisk Project Security Advisory - AST-2017-008
Posted Sep 20, 2017
Authored by Klaus-Peter Junghanns | Site asterisk.org

Asterisk Project Security Advisory - Insufficient RTCP packet validation could allow reading stale buffer contents and when combined with the nat and symmetric_rtp options allow redirecting where Asterisk sends the next RTCP report.

tags | advisory
advisories | CVE-2017-14099
MD5 | d059f1a85e6d55a3c38cf209cf91c0ce

Asterisk Project Security Advisory - AST-2017-008

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               Asterisk Project Security Advisory - AST-2017-008

Product Asterisk
Summary RTP/RTCP information leak
Nature of Advisory Unauthorized data disclosure
Susceptibility Remote Unauthenticated Sessions
Severity Critical
Exploits Known Yes
Reported On September 1, 2017
Reported By Klaus-Peter Junghanns
Posted On September 19, 2017
Last Updated On September 19, 2017
Advisory Contact Richard Mudgett <rmudgett AT digium DOT com>
CVE Name CVE-2017-14099

Description This is a follow up advisory to AST-2017-005.

Insufficient RTCP packet validation could allow reading
stale buffer contents and when combined with the anata and
asymmetric_rtpa options allow redirecting where Asterisk
sends the next RTCP report.

The RTP stream qualification to learn the source address of
media always accepted the first RTP packet as the new
source and allowed what AST-2017-005 was mitigating. The
intent was to qualify a series of packets before accepting
the new source address.

Resolution The RTP/RTCP stack will now validate RTCP packets before
processing them. Packets failing validation are discarded.
RTP stream qualification now requires the intended series of
packets from the same address without seeing packets from a
different source address to accept a new source address.

Affected Versions
Product Release
Series
Asterisk Open Source 11.x All Releases
Asterisk Open Source 13.x All Releases
Asterisk Open Source 14.x All Releases
Certified Asterisk 11.6 All Releases
Certified Asterisk 13.13 All Releases

Corrected In
Product Release
Asterisk Open Source 11.25.3, 13.17.2, 14.6.2
Certified Asterisk 11.6-cert18, 13.13-cert6

Patches
SVN URL Revision
http://downloads.asterisk.org/pub/security/AST-2017-008-11.diff Asterisk
11
http://downloads.asterisk.org/pub/security/AST-2017-008-13.diff Asterisk
13
http://downloads.asterisk.org/pub/security/AST-2017-008-14.diff Asterisk
14
http://downloads.asterisk.org/pub/security/AST-2017-008-11.6.diff Certified
Asterisk
11.6
http://downloads.asterisk.org/pub/security/AST-2017-008-13.13.diff Certified
Asterisk
13.13

Links https://issues.asterisk.org/jira/browse/ASTERISK-27274

https://issues.asterisk.org/jira/browse/ASTERISK-27252

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-2017-008.pdf and
http://downloads.digium.com/pub/security/AST-2017-008.html

Revision History
Date Editor Revisions Made
09/15/2017 Richard Mudgett Initial revision
09/19/2017 Joshua Colp Added CVE

Asterisk Project Security Advisory - AST-2017-008
Copyright A(c) 2017 Digium, Inc. All Rights Reserved.
Permission is hereby granted to distribute and publish this advisory in its
original, unaltered form.

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