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AUSCERT External Security Bulletin Redistribution
ESB-2019.3388
AST-2019-004: A vulnerability has been identified in Asterisk
6 September 2019
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AusCERT Security Bulletin Summary
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Product: Asterisk
Publisher: Asterisk
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Denial of Service -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2019-15297
Original Bulletin:
http://downloads.asterisk.org/pub/security/AST-2019-004.html
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Asterisk Project Security Advisory - AST-2019-004
Product Asterisk
Summary Crash when negotiating for T.38 with a declined stream
Nature of Advisory Remote Crash
Susceptibility Remote Authenticated Sessions
Severity Minor
Exploits Known No
Reported On August 05, 2019
Reported By Alexei Gradinari
Posted On September 05, 2019
Last Updated On September 4, 2019
Advisory Contact kharwell AT sangoma DOT com
CVE Name CVE-2019-15297
Description When Asterisk sends a re-invite initiating T.38 faxing, and the endpoint
responds with a declined media stream a crash will then occur in Asterisk.
Modules Affected res_pjsip_t38.c
Resolution If T.38 faxing is not required then setting the t38_udptl configuration
option on the endpoint to no disables this functionality. This option
defaults to no so you have to have explicitly set it yes to potentially
be affected by this issue.
Otherwise, if T.38 faxing is required then Asterisk should be upgraded to a
fixed version.
Affected Versions
Product Release
Series
Asterisk Open Source 15.x All releases
Asterisk Open Source 16.x All releases
Corrected In
Product Release
Asterisk Open Source 15.7.4,16.5.1
Patches
SVN URL Revision
http://downloads.asterisk.org/pub/security/ Asterisk 15
AST-2019-004-15.diff
http://downloads.asterisk.org/pub/security/ Asterisk 16
AST-2019-004-16.diff
Links https://issues.asterisk.org/jira/browse/ASTERISK-28495
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This document may be superseded by later versions; if so, the latest version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-2019-004 .pdf
and http://downloads.digium.com/pub/security/ AST-2019-004 .html
Revision History
Date Editor Revisions Made
August 28, 2019 Kevin Harwell Initial revision
Asterisk Project Security Advisory - AST-2019-004
Copyright (C) 2019 Digium, Inc. All Rights Reserved.
Permission is hereby granted to distribute and publish this advisory in its
original, unaltered form.
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