Asterisk Security Team
2018-Jun-11 22:29 UTC
[asterisk-announce] AST-2018-008: PJSIP endpoint presence disclosure when using ACL
Asterisk Project Security Advisory - AST-2018-008 Product Asterisk Summary PJSIP endpoint presence disclosure when using ACL Nature of Advisory Unauthorized data disclosure Susceptibility Remote Unauthenticated Sessions Severity Minor Exploits Known No Reported On April 19, 2018 Reported By John Posted On June 11, 2018 Last Updated On June 11, 2018 Advisory Contact Rmudgett AT digium DOT com CVE Name Description When endpoint specific ACL rules block a SIP request they respond with a 403 forbidden. However, if an endpoint is not identified then a 401 unauthorized response is sent. This vulnerability just discloses which requests hit a defined endpoint. The ACL rules cannot be bypassed to gain access to the disclosed endpoints. Resolution Endpoint specific ACL rules now respond with a 401 challenge which is the same as if an endpoint were not identified. An alternate is to use global ACL rules to avoid the information disclosure. Affected Versions Product Release Series Asterisk Open Source 13.x 13.10.0 and later Asterisk Open Source 14.x All releases Asterisk Open Source 15.x All releases Certified Asterisk 13.18 All releases Certified Asterisk 13.21 All releases Corrected In Product Release Asterisk Open Source 13.21.1, 14.7.7, 15.4.1 Certified Asterisk 13.18-cert4, 13.21-cert2 Patches SVN URL Revision http://downloads.asterisk.org/pub/security/AST-2018-008-13.diff Asterisk 13 http://downloads.asterisk.org/pub/security/AST-2018-008-14.diff Asterisk 14 http://downloads.asterisk.org/pub/security/AST-2018-008-15.diff Asterisk 15 http://downloads.asterisk.org/pub/security/AST-2018-008-13.18.diff Certified Asterisk 13.18 http://downloads.asterisk.org/pub/security/AST-2018-008-13.21.diff Certified Asterisk 13.21 Links Asterisk Project Security Advisories are posted at http://www.asterisk.org/security This document may be superseded by later versions; if so, the latest version will be posted at http://downloads.digium.com/pub/security/AST-2018-008.pdf and http://downloads.digium.com/pub/security/AST-2018-008.html Revision History Date Editor Revisions Made May 1, 2018 Richard Mudgett Initial revision June 11, 2018 Richard Mudgett Added Certified Asterisk 13.21 Asterisk Project Security Advisory - AST-2018-008 Copyright (c) 2018 Digium, Inc. All Rights Reserved. Permission is hereby granted to distribute and publish this advisory in its original, unaltered form.
Apparently Analagous Threads
- Asterisk 15.4.1, 13.21.1, 14.7.7, 13.18-cert4 and 13.21-cert2 Now Available (Security)
- AST-2017-008: RTP/RTCP information leak
- AST-2018-009: Remote crash vulnerability in HTTP websocket upgrade
- AST-2019-002: Remote crash vulnerability with MESSAGE messages
- AST-2019-008: Re-invite with T.38 and malformed SDP causes crash.