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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.4421 Asterisk Project Security Advisory 22 November 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Asterisk Publisher: Asterisk Operating System: Windows UNIX variants (UNIX, Linux, OSX) Impact/Access: Execute Arbitrary Code/Commands -- Existing Account Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2019-18976 CVE-2019-18790 CVE-2019-18610 Original Bulletin: http://downloads.asterisk.org/pub/security/AST-2019-006.html http://downloads.asterisk.org/pub/security/AST-2019-007.html http://downloads.asterisk.org/pub/security/AST-2019-008.html Comment: This bulletin contains three (3) security advisories. - --------------------------BEGIN INCLUDED TEXT-------------------- Asterisk Project Security Advisory - AST-2019-006 Product Asterisk Summary SIP request can change address of a SIP peer. Nature of Advisory Denial of Service Susceptibility Remote Unauthenticated Sessions Severity Minor Exploits Known No Reported On October 17, 2019 Reported By Andrey V. T. Posted On November 21, 2019 Last Updated On November 21, 2019 Advisory Contact bford AT sangoma DOT com CVE Name CVE-2019-18790 Description A SIP request can be sent to Asterisk that can change a SIP peer s IP address. A REGISTER does not need to occur, and calls can be hijacked as a result. The only thing that needs to be known is the peer s name; authentication details such as passwords do not need to be known. This vulnerability is only exploitable when the nat option is set to the default, or auto_force_rport . Modules Affected channels/chan_sip.c Resolution Using any other option value for nat will prevent the attack (such as nat =no or nat=force_rport ), but will need to be tested on an individual basis to ensure that it works for the user s deployment. On the fixed versions of Asterisk, it will no longer set the address of the peer before authentication is successful when a SIP request comes in. Affected Versions Product Release Series Asterisk Open Source 13.x All releases Asterisk Open Source 16.x All releases Asterisk Open Source 17.x All releases Certified Asterisk 13.21 All releases Corrected In Product Release Asterisk Open Source 13.29.2 Asterisk Open Source 16.6.2 Asterisk Open Source 17.0.1 Certified Asterisk 13.21-cert5 Patches SVN URL Revision http://downloads.asterisk.org/pub/security/ Asterisk 13 AST-2019-00 6 -13.diff http://downloads.asterisk.org/pub/security/ Asterisk 16 AST-2019-00 6 -1 6 .diff http://downloads.asterisk.org/pub/security/ Asterisk 17 AST-2019-00 6 -1 7 .diff http://downloads.asterisk.org/pub/security/ Certified Asterisk 13.21-cert5 AST-2019-00 6 -13. 21 .diff Links https://issues.asterisk.org/jira/browse/ASTERISK-28589 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-2019-006 .pdf and http://downloads.digium.com/pub/security/ AST-2019-006 .html Revision History Date Editor Revisions Made October 22, 2019 Ben Ford Initial Revision November 14, 2019 Ben Ford Corrected and updated fields for versioning, and added CVE November 21, 2019 Ben Ford Added Posted On date Asterisk Project Security Advisory - AST-2019-006 Copyright (C) 2019 Digium, Inc. All Rights Reserved. Permission is hereby granted to distribute and publish this advisory in its original, unaltered form. =============================================================================== Asterisk Project Security Advisory - AST-2019-007 Product Asterisk Summary AMI user could execute system commands. Nature of Advisory Remote Code Execution Susceptibility Remote Authenticated Sessions Severity Minor Exploits Known No Reported On October 10, 2019 Reported By Eliel SardaA+-ons Posted On November 21, 2019 Last Updated On November 21, 2019 Advisory Contact gjoseph AT digium DOT com CVE Name CVE-2019-18610 Description A remote authenticated Asterisk Manager Interface (AMI) user without system authorization could use a specially crafted Originate AMI request to execute arbitrary system commands. Modules Affected manager.c Resolution The specific parameters of the Originate AMI request that allowed the remote code execution are now blocked if the user does not have the system authorization. Affected Versions Product Release Series Asterisk Open Source 13.x All releases Asterisk Open Source 16.x All releases Asterisk Open Source 17.x All releases Certified Asterisk 13.21 All releases Corrected In Product Release Asterisk Open Source 13.29.2 Asterisk Open Source 16.6.2 Asterisk Open Source 17.0.1 Certified Asterisk 13.21-cert5 Patches SVN URL Revision http://downloads.asterisk.org/pub/security/ Asterisk 13 AST-2019-00 7 -13.diff http://downloads.asterisk.org/pub/security/ Asterisk 16 AST-2019-00 7 -1 6 .diff http://downloads.asterisk.org/pub/security/ Asterisk 17 AST-2019-00 7 -1 7 .diff http://downloads.asterisk.org/pub/security/ Certified Asterisk 13.21-cert5 AST-2019-00 7 -13. 21 .diff Links https://issues.asterisk.org/jira/browse/ASTERISK-28580 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-2019-007 .pdf and http://downloads.digium.com/pub/security/ AST-2019-007 .html Revision History Date Editor Revisions Made October 24, 2019 George Joseph Initial Revision November 21, 2019 Ben Ford Added Posted On date Asterisk Project Security Advisory - AST-2019-007 Copyright (C) 2019 Digium, Inc. All Rights Reserved. Permission is hereby granted to distribute and publish this advisory in its original, unaltered form. =============================================================================== Asterisk Project Security Advisory - Product Asterisk Summary Re-invite with T.38 and malformed SDP causes crash. Nature of Advisory Remote Crash Susceptibility Remote Authenticated Sessions Severity Minor Exploits Known No Reported On November 07, 2019 Reported By Salah Ahmed Posted On November 21, 2019 Last Updated On November 21, 2019 Advisory Contact bford AT sangoma DOT com CVE Name CVE-2019-18976 Description If Asterisk receives a re-invite initiating T.38 faxing and has a port of 0 and no c line in the SDP, a crash will occur. Modules Affected res_pjsip_t38.c Resolution If T.38 faxing is not needed, then the t38_udptl configuration option in pjsip.conf can be set to no to disable the functionality. This option automatically defaults to no and would have to be manually turned on to experience this crash. If T.38 faxing is needed, then Asterisk should be upgraded to a fixed version. Affected Versions Product Release Series Asterisk Open Source 13.x All versions Certified Asterisk 13.21 All versions Corrected In Product Release Asterisk Open Source 13.29.2 Certified Asterisk 13.21-cert5 Patches SVN URL Revision http://downloads.asterisk.org/pub/security/ Asterisk 13 AST-2019-00 8 -13.diff http://downloads.asterisk.org/pub/security/ Certified Asterisk 13.21-cert5 AST-2019-00 8 -13. 21 .diff Links https://issues.asterisk.org/jira/browse/ASTERISK-28612 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/ .pdf and http:// downloads.digium.com/pub/security/ .html Revision History Date Editor Revisions Made November 12, 2019 Ben Ford Initial Revision November 21, 2019 Ben Ford Added Posted On date Asterisk Project Security Advisory - Copyright (C) 2019 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 auscert@auscert.org.au 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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Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBXddIPWaOgq3Tt24GAQj87w//fTmbcPcD2y0/440uurpdX3Dt3E/uEZcc ArTV7ZjwpnzS2qQE62+xOc5muC4cMWaBEfJgZLuRSDxr8w8teqiYlajOYBOZsot7 if5sUclJQBLC6akrsqfD1n8jaXaMhs+mR3dUu/halt8m02Z6TruTv90MwDMhkGk1 Actm+r6bOxVzmQ0rNrtYsUgu7yxmp3lamFAROvmYQ8cdFKwuE/yKNiR/od26pZEF aIVN1y0TEgSWGOLlDke9GS0IoEW2tkGwgxmHV/pZhA0WJUsU0Rs9FWazKgoOh6Ec tpk3H6ycIzEnY0pmTAIcsiOucoC+elO0gk956qsmpS/wunLLfYJcy7ely04iJzlR pr44we1E4QxpYQAYtnUqcHRFqTmHri/pvKU6d1AYHOU+GJGnYsYbz88Np4x+C0/z z0uTXsvL2PE00ihLCTpqkVydwVfa2OMsJhWsNYwpHBYbJCNKoIv0C4CYrUt7Khnz 1wDzUOuNA0wQSE1SrI0+FV5BXfxjY47EkO+L4yZ96wRiS56QJNcZr5hPSXgYH74J rpScKZqPt8vHZXlwJYNR0qxEpmmACuIVrdysZmF7dtmdHCtrrDRDJAhJy8S1FLHq IvxwzMCbxy8p3xGFDo1u+MBrxVAtnPd+0QFMH87zdeSdNCXiwFDmIOIAc2RuGYOR zUCL9FGxFcQ= =Xh2M -----END PGP SIGNATURE-----