var-201911-0701
Vulnerability from variot
An issue was discovered in channels/chan_sip.c in Sangoma Asterisk 13.x before 13.29.2, 16.x before 16.6.2, and 17.x before 17.0.1, and Certified Asterisk 13.21 before cert5. 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. Sangoma Technologies Asterisk is an open source telephone exchange (PBX) system software. The software supports voice mail, multi-party voice conferencing, interactive voice response (IVR), and more. An attacker could use this vulnerability to cause a denial of service.
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.
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/AST-2019-006-13.diff Asterisk 13
http://downloads.asterisk.org/pub/security/AST-2019-006-16.diff Asterisk 16
http://downloads.asterisk.org/pub/security/AST-2019-006-17.diff Asterisk 17
http://downloads.asterisk.org/pub/security/AST-2019-006-13.21.diff Certified
Asterisk
13.21-cert5
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This document may be superseded by later versions; if so, the latest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 © 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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"data": "An issue was discovered in channels/chan_sip.c in Sangoma Asterisk 13.x before 13.29.2, 16.x before 16.6.2, and 17.x before 17.0.1, and Certified Asterisk 13.21 before cert5. A SIP request can be sent to Asterisk that can change a SIP peer\u0027s 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\u0027s 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. Sangoma Technologies Asterisk is an open source telephone exchange (PBX) system software. The software supports voice mail, multi-party voice conferencing, interactive voice response (IVR), and more. An attacker could use this vulnerability to cause a denial of service. \n Nature of Advisory Denial of Service \n Susceptibility Remote Unauthenticated Sessions \n Severity Minor \n Exploits Known No \n Reported On October 17, 2019 \n Reported By Andrey V. T. \n Modules Affected channels/chan_sip.c \n\n Resolution Using any other option value for \u201cnat\u201d will prevent the \n attack (such as \u201cnat=no\u201d or \u201cnat=force_rport\u201d), but will \n need to be tested on an individual basis to ensure that it \n works for the user\u2019s deployment. On the fixed versions of \n Asterisk, it will no longer set the address of the peer \n before authentication is successful when a SIP request comes \n in. \n\n Affected Versions \n Product Release \n Series \n Asterisk Open Source 13.x All releases \n Asterisk Open Source 16.x All releases \n Asterisk Open Source 17.x All releases \n Certified Asterisk 13.21 All releases \n\n Corrected In \n Product Release \n Asterisk Open Source 13.29.2 \n Asterisk Open Source 16.6.2 \n Asterisk Open Source 17.0.1 \n Certified Asterisk 13.21-cert5 \n\n Patches \n SVN URL Revision \n http://downloads.asterisk.org/pub/security/AST-2019-006-13.diff Asterisk 13 \n http://downloads.asterisk.org/pub/security/AST-2019-006-16.diff Asterisk 16 \n http://downloads.asterisk.org/pub/security/AST-2019-006-17.diff Asterisk 17 \n http://downloads.asterisk.org/pub/security/AST-2019-006-13.21.diff Certified \n Asterisk \n 13.21-cert5 \n\n Links https://issues.asterisk.org/jira/browse/ASTERISK-28589 \n\n Asterisk Project Security Advisories are posted at \n http://www.asterisk.org/security \n \n This document may be superseded by later versions; if so, the latest \n version will be posted at \n http://downloads.digium.com/pub/security/AST-2019-006.pdf and \n http://downloads.digium.com/pub/security/AST-2019-006.html \n\n Revision History\n Date Editor Revisions Made \n October 22, 2019 Ben Ford Initial Revision \n November 14, 2019 Ben Ford Corrected and updated fields for \n versioning, and added CVE \n November 21, 2019 Ben Ford Added \u201cPosted On\u201d date \n\n Asterisk Project Security Advisory - AST-2019-006\n Copyright \u00a9 2019 Digium, Inc. All Rights Reserved. \n Permission is hereby granted to distribute and publish this advisory in its\n original, unaltered form",
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.