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Asterisk Project Security Advisory - AST-2022-002

Asterisk Project Security Advisory - AST-2022-002
Posted Apr 15, 2022
Authored by Ben Ford, Clint Ruoho | Site asterisk.org

Asterisk suffers from a server-side request forgery vulnerability. When using STIR/SHAKEN, it is possible to send arbitrary requests like GET to interfaces such as localhost using the Identity header. Asterisk Open Source versions 16.15.0 up to but not including 16.25.2, 18.x up to but not including 18.11.2, and 19.x up to but not including 19.3.2 are affected.

tags | advisory, arbitrary
advisories | CVE-2022-26499
SHA-256 | 7727f89aa5888d067b6bf9ed78cdb7e6304adf0a733433e0687a3678d88eb17b

Asterisk Project Security Advisory - AST-2022-002

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               Asterisk Project Security Advisory - AST-2022-002

Product Asterisk
Summary res_stir_shaken: SSRF vulnerability with Identity
Nature of Advisory Server-side request forgery
Susceptibility Remote unauthenticated access
Severity Major
Exploits Known No
Reported On Jun 10, 2021
Reported By Clint Ruoho
Posted On Apr 14, 2022
Last Updated On April 13, 2022
Advisory Contact bford AT sangoma DOT com
CVE Name CVE-2022-26499

Description When using STIR/SHAKEN, it’s possible to send
arbitrary requests like GET to interfaces such as
localhost using the Identity header.
Modules Affected res_stir_shaken

Resolution If you are using STIR/SHAKEN in Asterisk, upgrade to one of
the versions listed below to get a new configuration option:
stir_shaken_profile. This can be configured in
stir_shaken.conf and set on a per endpoint basis in
pjsip.conf. This option will take priority over the
stir_shaken option. The stir_shaken_profile will contain the
stir_shaken option (attest, verify, or both), as well as ACL
configuration options to permit and deny specific IP
addresses / hosts. The ACL will be used for the public key
URL we receive in the Identity header, which is used to tell
Asterisk where to download the public certificate. An ACL
from acl.conf can be used, but you can specify your own
permit and deny lines within the profile itself. A
combination of both can also be used.

Note that this patch contains changes that affect the same
area as the patch from AST-2022-001. It is recommended that
you upgrade to a listed version, otherwise you might
encounter merge conflicts.

Affected Versions
Product Release Series
Asterisk Open Source 16.x 16.15.0 and after
Asterisk Open Source 18.x All versions
Asterisk Open Source 19.x All versions

Corrected In
Product Release
Asterisk Open Source 16.25.2, 18.11.2, 19.3.2

Patch URL Revision
https://downloads.digium.com/pub/security/AST-2022-002-16.diff Asterisk
https://downloads.digium.com/pub/security/AST-2022-002-18.diff Asterisk
https://downloads.digium.com/pub/security/AST-2022-002-19.diff Asterisk

Links https://issues.asterisk.org/jira/browse/ASTERISK-29476


Asterisk Project Security Advisories are posted at

This document may be superseded by later versions; if so, the latest
version will be posted at
https://downloads.digium.com/pub/security/AST-2022-002.pdf and

Revision History
Date Editor Revisions Made
Apr 13, 2022 Ben Ford Initial revision

Asterisk Project Security Advisory - AST-2022-002
Copyright © 01/19/2022 Digium, Inc. All Rights Reserved.
Permission is hereby granted to distribute and publish this advisory in its
original, unaltered form.
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