21 September 2018
Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2018.2826 Asterisk Project Security Advisory - AST-2018-009 21 September 2018 =========================================================================== 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 - --------------------------BEGIN INCLUDED TEXT-------------------- 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Asterisk Project Security Advisories are posted at http://www.asterisk.org/ security This document may be superseded by later versions; if so, the latest version will be posted at http://downloads.digium.com/pub/security/AST-2018-009.pdf and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. - --------------------------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 firstname.lastname@example.org 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. 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On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBW6R6gGaOgq3Tt24GAQgOMA/+K/gGu31jkpf1IMHd7QbTEsJSJJC5FY5v wzwf0ikrODG9y76s0ftnUqxLYx+UwsZhcKFMsgOQMVhIDGvCG/bkXFuV5O/j5+QG OiIT/db+l1f5kGniLH6EPbLDfeC9z88fzLD2HruRgI4FyQMQOFb1hwrX/c4ImUdC 9o6HUB2IqYsxqXwm78cco5iiGH66ATeypV1ZVcy/O5fO+wMtW1juB6eI0kAWn4Zy o4Un4TSE75Wwkf2pyOcutxaazUiEuO/hciBPrJwGTpi+O3JZnXXCLU/xCDtX5pdk PdrVRWcTyD9f4BtbWdRrvvbc1UdHibZAQcb353YHLDCoyIrrHhlDI2HiHL5za8NW CjMVFrIYDVt/0yjYNvNe1mGAbXkM42pXl5qwnpr2ETtntV3pz3xOlq7rj0Snd3Rl en+EA9972bZfQwDQYMlkNG0hw3m6D7cnU/eqCQZ/uCf+K2SrUZ++Zaxu1WGRGK0M 7aa/qVDkDl7egZSdvlt387PqeoTHx3B+TIWYLwlk78f989FyFCEQXQNJWuodPIb9 HLFc6JXCGU+rI8HEQDISbebB6VHMOsHltRJ7ZthpYQ3gHYZyQkutQVlDyjy1OPk1 Q/BbQFZB20UKsjEDDgm7sHdsyFBITX1hXATrvZt/iThOcwdxHrMNEtzdFPdbEXLx 7Psar4p1fnk= =x0F5 -----END PGP SIGNATURE-----