Asterisk Project Security Advisory – AST-2020-003

Asterisk Project Security Advisory – AST-2020-003

Product Asterisk
Summary Remote crash in res_pjsip_diversion
Nature of Advisory Denial of service
Susceptibility Remote authenticated sessions
Severity Moderate
Exploits Known Yes
Reported On December 22, 2020
Reported By Torrey Searle
Posted On December 22, 2020
Last Updated On December 22, 2020
Advisory Contact kharwell AT sangoma DOT com
CVE Name

Description A crash can occur in Asterisk when a SIP message is
received that has a History-Info header, which
contains a tel-uri.

Note, the remote client must be authenticated, or
Asterisk must be configured for anonymous calling in
order for this problem to manifest.
Modules Affected res_pjsip_diversion.c

Resolution Asterisk now ensures that if it receives a SIP message with
a History-Info header that contains a tel-uri the
redirecting cause is simply set to unknown.

Affected Versions
Product Release Series
Asterisk Open Source 13.X 13.38.0
Asterisk Open Source 16.X 16.15.0
Asterisk Open Source 17.X 17.9.0
Asterisk Open Source 18.X 18.1.0

Corrected In
Product Release
Asterisk Open Source 13.38.1, 16.15.1, 17.9.1, 18.1.1

Patches
SVN URL Revision
https://downloads.asterisk.org/pub/security/AST-2020-003-13.diff Asterisk
13
https://downloads.asterisk.org/pub/security/AST-2020-003-16.diff Asterisk
16
https://downloads.asterisk.org/pub/security/AST-2020-003-17.diff Asterisk
17
https://downloads.asterisk.org/pub/security/AST-2020-003-18.diff Asterisk
18

Links https://issues.asterisk.org/jira/browse/ASTERISK-29219

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This document may be superseded by later versions; if so, the latest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-2020-003.pdf and
http://downloads.digium.com/pub/security/AST-2020-003.html

Revision History
Date Editor Revisions Made
December 22, 2020 Kevin Harwell Initial revision

Asterisk Project Security Advisory – AST-2020-003
Copyright © 2020 Digium, Inc. All Rights Reserved.
Permission is hereby granted to distribute and publish this advisory in its
original, unaltered form.