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AUSCERT External Security Bulletin Redistribution
ESB-2018.2826
Asterisk Project Security Advisory - AST-2018-009
21 September 2018
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AusCERT Security Bulletin Summary
---------------------------------
Product: Asterisk
Publisher: Asterisk
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2018-17281
Original Bulletin:
http://downloads.asterisk.org/pub/security/AST-2018-009.html
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Asterisk Project Security Advisory - AST-2018-009
Product Asterisk
Summary Remote crash vulnerability in HTTP websocket upgrade
Nature of Advisory Denial Of Service
Susceptibility Remote Unauthenticated Sessions
Severity Moderate
Exploits Known No
Reported On August 16, 2018
Reported By Sean Bright
Posted On
Last Updated On September 20, 2018
Advisory Contact Rmudgett AT digium DOT com
CVE Name CVE-2018-17281
Description There is a stack overflow vulnerability in the res_http_websocket.so module of
Asterisk that allows an attacker to crash Asterisk via a specially crafted HTTP
request to upgrade the connection to a websocket. The attacker's request causes
Asterisk to run out of stack space and crash.
Resolution Disable HTTP websocket access by not loading the res_http_websocket.so module
or upgrade Asterisk to a fixed version.
Affected Versions
Product Release
Series
Asterisk Open Source 13.x All releases
Asterisk Open Source 14.x All releases
Asterisk Open Source 15.x All releases
Certified Asterisk 13.21 All releases
Corrected In
Product Release
Asterisk Open Source 13.23.1, 14.7.8, 15.6.1
Certified Asterisk 13.21-cert3
Patches
SVN URL Revision
http://downloads.asterisk.org/pub/security/ Asterisk 13
AST-2018-009-13.diff
http://downloads.asterisk.org/pub/security/ Asterisk 14
AST-2018-009-14.diff
http://downloads.asterisk.org/pub/security/ Asterisk 15
AST-2018-009-15.diff
http://downloads.asterisk.org/pub/security/ Certified Asterisk 13.21
AST-2018-009-13.21.diff
Links https://issues.asterisk.org/jira/browse/ASTERISK-28013
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This document may be superseded by later versions; if so, the latest version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-2018-009.pdf and
http://downloads.digium.com/pub/security/AST-2018-009.html
Revision History
Date Editor Revisions Made
August 31, 2018 Richard Mudgett Initial revision
September 20, 2018 Richard Mudgett Added CVE name.
Asterisk Project Security Advisory - AST-2018-009
Copyright (C) 2018 Digium, Inc. All Rights Reserved.
Permission is hereby granted to distribute and publish this advisory in its
original, unaltered form.
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