[asterisk-users] AST-2019-005: Remote Crash Vulnerability in audio transcoding
Asterisk Project Security Advisory - AST-2019-005 Product Asterisk Summary Remote Crash Vulnerability in audio transcoding Nature of Advisory Denial of Service Susceptibility Remote Unauthenticated Sessions SeverityMinor Exploits Known No Reported On August 7, 2019 Reported By Gregory Massel Posted On Last Updated On August 26, 2019 Advisory ContactJcolp AT sangoma DOT com CVE NameCVE-2019-15639 Description When audio frames are given to the audio transcoding support in Asterisk the number of samples are examined and as part of this a message is output to indicate that no samples are present. A change was done to suppress this message for a particular scenario in which the message was not relevant. This change assumed that information about the origin of a frame will always exist when in reality it may not. This issue presented itself when an RTP packet containing no audio (and thus no samples) was received. In a particular transcoding scenario this audio frame would get turned into a frame with no origin information. If this new frame was then given to the audio transcoding support a crash would occur as no samples and no origin information would be present. The transcoding scenario requires the âgenericplcâ option to be set to enabled (the default) and a transcoding path from the source format into signed linear and then from signed linear into another format. Note that there may be other scenarios that have not been found which can cause an audio frame with no origin to be given to the audio transcoding support and thus cause a crash. Modules Affected main/translate.c Resolution The âgenericplcâ option can be disabled in codecs.conf to mitigate the described scenario. It is recommended, however, that Asterisk be upgraded to one of the listed versions or the linked patch applied to protect against potential unknown scenarios. Affected Versions Product Release Series Asterisk Open Source 13.x 13.28.0 Asterisk Open Source 16.x 16.5.0 Corrected In Product Release Asterisk Open Source 13.28.1 Asterisk Open Source16.5.1 Patches SVN URL Revision http://downloads.asterisk.org/pub/security/AST-2019-005-13.diff Asterisk 13 http://downloads.asterisk.org/pub/security/AST-2019-005-16.diff Asterisk 16 Links https://issues.asterisk.org/jira/browse/ASTERISK-28499 Asterisk Project Security Advisories are posted at http://www.asterisk.org/security This document may be superseded by later versions; if so, the latest version will be posted at
[asterisk-users] AST-2019-004: Crash when negotiating for T.38 with a declined stream
Asterisk Project Security Advisory - AST-2019-004 ProductAsterisk SummaryCrash when negotiating for T.38 with a declined stream Nature of Advisory Remote Crash SusceptibilityRemote Authenticated Sessions Severity Minor Exploits KnownNo Reported On August 05, 2019 Reported By Alexei Gradinari Posted On September 05, 2019 Last Updated OnSeptember 4, 2019 Advisory Contact kharwell AT sangoma DOT com CVE Name CVE-2019-15297 Description When Asterisk sends a re-invite initiating T.38 faxing, and the endpoint responds with a declined media stream a crash will then occur in Asterisk. Modules Affected res_pjsip_t38.c Resolution If T.38 faxing is not required then setting the ât38_udptlâ configuration option on the endpoint to ânoâ disables this functionality. This option defaults to ânoâ so you have to have explicitly set it âyesâ to potentially be affected by this issue. Otherwise, if T.38 faxing is required then Asterisk should be upgraded to a fixed version. Affected Versions Product Release Series Asterisk Open Source 15.x All releases Asterisk Open Source 16.x All releases Corrected In Product Release Asterisk Open Source 15.7.4,16.5.1 Patches SVN URL Revision http://downloads.asterisk.org/pub/security/AST-2019-004-15.diff Asterisk 15 http://downloads.asterisk.org/pub/security/AST-2019-004-16.diff Asterisk 16 Links https://issues.asterisk.org/jira/browse/ASTERISK-28495 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-2019-004.pdf and http://downloads.digium.com/pub/security/AST-2019-004.html Revision History Date Editor Revisions Made August 28, 2019Kevin Harwell Initial revision Asterisk Project Security Advisory - AST-2019-004 Copyright © 2019 Digium, Inc. All Rights Reserved. Permission is hereby granted to distribute and publish this advisory in its original, unaltered form. -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- Check out the new Asterisk community forum at: https://community.asterisk.org/ New to Asterisk? Start here: https://wiki.asterisk.org/wiki/display/AST/Getting+Started asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
[asterisk-users] Asterisk 13.28.1, 15.7.4 and 16.5.1 Now Available (Security)
The Asterisk Development Team would like to announce security releases for Asterisk 13, 15 and 16. The available releases are released as versions 13.28.1, 15.7.4 and 16.5.1. These releases are available for immediate download at https://downloads.asterisk.org/pub/telephony/asterisk/releases The following security vulnerabilities were resolved in these versions: * AST-2019-004: Crash when negotiating for T.38 with a declined stream When Asterisk sends a re-invite initiating T.38 faxing, and the endpoint responds with a declined media stream a crash will then occur in Asterisk. * AST-2019-005: Remote Crash Vulnerability in audio transcoding When audio frames are given to the audio transcoding support in Asterisk the number of samples are examined and as part of this a message is output to indicate that no samples are present. A change was done to suppress this message for a particular scenario in which the message was not relevant. This change assumed that information about the origin of a frame will always exist when in reality it may not. For a full list of changes in the current releases, please see the ChangeLogs: https://downloads.asterisk.org/pub/telephony/asterisk/releases/ChangeLog-13.28.1 https://downloads.asterisk.org/pub/telephony/asterisk/releases/ChangeLog-15.7.4 https://downloads.asterisk.org/pub/telephony/asterisk/releases/ChangeLog-16.5.1 The security advisories are available at: https://downloads.asterisk.org/pub/security/AST-2019-004.pdf https://downloads.asterisk.org/pub/security/AST-2019-005.pdf Thank you for your continued support of Asterisk!-- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- Check out the new Asterisk community forum at: https://community.asterisk.org/ New to Asterisk? Start here: https://wiki.asterisk.org/wiki/display/AST/Getting+Started asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] asterisk-users Digest, Vol 181, Issue 3
In article <874506323.2924334.1567645810...@mail.yahoo.com>, bilal ghayyad wrote: > > Thank you a lot for your kindly help and reply. Actually it helped me a > lot.I was using _X. in the extensions.conf at > the trunkinbound context.Can you advise me what is the difference between _X. > and s? In other words, when it is better > to use s and when it is better to use _X.? > Again, I am fully thanks for you.RegardsBilal They do different things. _X. will match any extension number beginning with a digit. This is what you would normally use to match incoming calls that specify a number, and is presumably what you have already. s will only match is no extension number is given. This would be the case for an analogue line, for example, or a SIP connection that didn't give a destination number. It is also matched for OPTIONS requests used to handle "qualify". So in your [trunkinbound] context, just add a line like this: exten => s,1,Hangup And leave everything else in that context unchanged. Cheers Tony -- Tony Mountifield Work: t...@softins.co.uk - http://www.softins.co.uk Play: t...@mountifield.org - http://tony.mountifield.org -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- Check out the new Asterisk community forum at: https://community.asterisk.org/ New to Asterisk? Start here: https://wiki.asterisk.org/wiki/display/AST/Getting+Started asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
