Asterisk Project Security Advisory – AST-2021-009

Asterisk Project Security Advisory – AST-2021-009

Product Asterisk
Summary pjproject/pjsip: crash when SSL socket destroyed
during handshake
Nature of Advisory Denial of service
Susceptibility Remote unauthenticated sessions
Severity Major
Exploits Known Yes
Reported On May 5, 2021
Reported By Andrew Yager
Posted On
Last Updated On July 6, 2021
Advisory Contact kharwell AT sangoma DOT com
CVE Name CVE-2021-32686

Description Depending on the timing, it’s possible for Asterisk to
crash when using a TLS connection if the underlying
socket parent/listener gets destroyed during the
handshake.
Modules Affected bundled pjproject

Resolution If you use “with-pjproject-bundled” then upgrade to, or
install one of, the versions of Asterisk listed below.
Otherwise install the appropriate version of pjproject that
contains the patch.

Affected Versions
Product Release Series
Asterisk Open Source 13.x All versions
Asterisk Open Source 16.x All versions
Asterisk Open Source 17.x All versions
Asterisk Open Source 18.x All versions
Certified Asterisk 16.x All versions

Corrected In
Product Release
Asterisk Open Source 13.38.3, 16.19.1, 17.9.4, 18.5.1
Certified Asterisk 16.8-cert10

Patches
Patch URL Revision
https://downloads.digium.com/pub/security/AST-2021-009-13.diff Asterisk
13
https://downloads.digium.com/pub/security/AST-2021-009-16.diff Asterisk
16
https://downloads.digium.com/pub/security/AST-2021-009-17.diff Asterisk
17
https://downloads.digium.com/pub/security/AST-2021-009-18.diff Asterisk
18
https://downloads.digium.com/pub/security/AST-2021-009-16.8.diff Certified
Asterisk
16.8

Links https://issues.asterisk.org/jira/browse/ASTERISK-29415

https://downloads.asterisk.org/pub/security/AST-2021-009.html

https://github.com/pjsip/pjproject/security/advisories/GHSA-cv8x-p47p-99wr

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This document may be superseded by later versions; if so, the latest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
https://downloads.digium.com/pub/security/AST-2021-009.pdf and
https://downloads.digium.com/pub/security/AST-2021-009.html

Revision History
Date Editor Revisions Made
June 14, 2021 Kevin Harwell Initial revision

Asterisk Project Security Advisory – AST-2021-009
Copyright © 2021 Digium, Inc. All Rights Reserved.
Permission is hereby granted to distribute and publish this advisory in its
original, unaltered form.