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 attackerâ??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/AST-2018-009-13.diff Asterisk 13 http://downloads.asterisk.org/pub/security/AST-2018-009-14.diff Asterisk 14 http://downloads.asterisk.org/pub/security/AST-2018-009-15.diff Asterisk 15 http://downloads.asterisk.org/pub/security/AST-2018-009-13.21.diff Certified Asterisk 13.21 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Asterisk Project Security Advisories are posted at http://www.asterisk.org/security This document may be superseded by later versions; if so, the latest version will be posted at http://downloads.digium.com/pub/security/AST-2018-009.pdf and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 © 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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