Product

Asterisk

Summary

pjproject: integer underflow on STUN message

Nature of Advisory

Arbitrary code execution

Susceptibility

Remote unauthenticated sessions

Severity

Major

Exploits Known

Yes

Reported On

March 3, 2022

Reported By

Sauw Ming

Posted On

March 4, 2022

Last Updated On

March 3, 2022

Advisory Contact

kharwell AT sangoma DOT com

CVE Name

CVE-2021-37706

Description

The header length on incoming STUN messages that contain an ERROR-CODE attribute is not properly checked. This can result in an integer underflow. Note, this requires ICE or WebRTC support to be in use with a malicious remote party.

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

16.x

All versions

Asterisk Open Source

18.x

All versions

Asterisk Open Source

19.x

All versions

Certified Asterisk

16.x

All versions

Corrected In

Product

Release

Asterisk Open Source

16.24.1,18.10.1,19.2.1

Certified Asterisk

16.8-cert13

Patches

Patch URL

Revision

https://downloads.digium.com/pub/security/AST-2022-004-16.diff

Asterisk 16

https://downloads.digium.com/pub/security/AST-2022-004-18.diff

Asterisk 18

https://downloads.digium.com/pub/security/AST-2022-004-19.diff

Asterisk 19

https://downloads.digium.com/pub/security/AST-2022-004-16.8.diff

Certified Asterisk 16.8

Links

https://issues.asterisk.org/jira/browse/ASTERISK-29945

https://downloads.asterisk.org/pub/security/AST-2022-004.html

https://github.com/pjsip/pjproject/security/advisories/GHSA-2qpg-f6wf-w984

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This document may be superseded by later versions; if so, the latest version will be posted at https://downloads.digium.com/pub/security/AST-2022-004.pdf and https://downloads.digium.com/pub/security/AST-2022-004.html

Revision History

Date

Editor

Revisions Made

March 3, 2022

Kevin Harwell

Initial revision