Maybe:
T.38 Gateway Fax Activity Timeout
By default, gateway mode will remain enabled throughout the life of a channel.
An optional timeout can be enabled to automatically disable gateway mode if
there is no fax activity a given time after two channels are bridged. Enabling
a timeout also has the side effect of reserving fax resources for a channel.
The timeout can be enabled by passing second parameter (a timeout in seconds)
when setting FAXOPT(gateway).
exten => 1,1,NoOp()
exten => 1,n,Set(FAXOPT(gateway)=yes,10) ; disable gateway if there is no fax
activity in 10 seconds
exten => 1,n,Dial(SIP/mypeer,20)
Krystyna Haberek
-----Original Message-----
From: asterisk-security <asterisk-security-boun...@lists.digium.com> On Behalf
Of Asterisk Security Team
Sent: September 5, 2019 7:50 AM
To: asterisk-security@lists.digium.com
Subject: [asterisk-security] AST-2019-004: Crash when negotiating for T.38 with
a declined stream
Asterisk Project Security Advisory - AST-2019-004
Product Asterisk
Summary Crash when negotiating for T.38 with a declined
stream
Nature of Advisory Remote Crash
Susceptibility Remote Authenticated Sessions
Severity Minor
Exploits Known No
Reported On August 05, 2019
Reported By Alexei Gradinari
Posted On September 05, 2019
Last Updated On September 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 ???t38_udptl???
configuration option on the endpoint to ???no??? disables this
functionality. This option defaults to ???no??? so you have to
have explicitly set it ???yes??? 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
https://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdownloads.asterisk.org%2Fpub%2Fsecurity%2FAST-2019-004-15.diff&data=02%7C01%7C%7C48c632173e4645d2677b08d7321121c5%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637032921465083334&sdata=3tpojkhZW5la529mGa3UMpORgf9nxB01pozoVymEc1o%3D&reserved=0
Asterisk
15
https://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdownloads.asterisk.org%2Fpub%2Fsecurity%2FAST-2019-004-16.diff&data=02%7C01%7C%7C48c632173e4645d2677b08d7321121c5%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637032921465083334&sdata=tg43YzaI%2BieB5829LIY%2FS8vi%2BH2lD8sR6rB61%2Bburiw%3D&reserved=0
Asterisk
16
Links
https://nam02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fissues.asterisk.org%2Fjira%2Fbrowse%2FASTERISK-28495&data=02%7C01%7C%7C48c632173e4645d2677b08d7321121c5%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637032921465083334&sdata=obuonOONUAmqFNh34UHpjMm%2BkCPLELAf%2FnMFaTUTtY0%3D&reserved=0
Asterisk Project Security Advisories are posted at
https://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.asterisk.org%2Fsecurity&data=02%7C01%7C%7C48c632173e4645d2677b08d7321121c5%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637032921465083334&sdata=10ZZ2QY%2Bze2m3U04%2BEQYcUmM2ilTxw229MpcXa4U4FY%3D&reserved=0
This document may be superseded by later versions; if so, the latest
version will be posted at
https://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdownloads.digium.com%2Fpub%2Fsecurity%2FAST-2019-004.pdf&data=02%7C01%7C%7C48c632173e4645d2677b08d7321121c5%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637032921465083334&sdata=MO63HCsGtSQ6MRfzcJQUWxaVFOz0TjSi8HDVupbr3D8%3D&reserved=0
and
https://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdownloads.digium.com%2Fpub%2Fsecurity%2FAST-2019-004.html&data=02%7C01%7C%7C48c632173e4645d2677b08d7321121c5%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637032921465083334&sdata=%2FNSziKGde8Bl1ImkkucQCj2pN%2BRG1E2GdRCk1tgCmTI%3D&reserved=0
Revision History
Date Editor Revisions Made
August 28, 2019 Kevin 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.
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