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Asterisk Project Security Advisory - AST-2021-003

Asterisk Project Security Advisory - AST-2021-003
Posted Feb 19, 2021
Authored by Alexander Traud, gjoseph | Site asterisk.org

An unauthenticated remote attacker could replay SRTP packets which could cause an Asterisk instance configured without strict RTP validation to tear down calls prematurely.

tags | advisory, remote
advisories | CVE-2021-26712
SHA-256 | c6b2cb980ac1c471ada712a10083d5e4a2f109aa8638a11055f9f18afbbc09ab

Asterisk Project Security Advisory - AST-2021-003

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               Asterisk Project Security Advisory - AST-2021-003

Product Asterisk
Summary Remote attacker could prematurely tear down SRTP
calls
Nature of Advisory Denial of Service
Susceptibility Remote unauthenticated sessions
Severity Moderate
Exploits Known No
Reported On January 22, 2021
Reported By Alexander Traud
Posted On
Last Updated On February 11, 2021
Advisory Contact gjoseph AT sangoma DOT com
CVE Name CVE-2021-26712

Description An unauthenticated remote attacker could replay SRTP
packets which could cause an Asterisk instance
configured without strict RTP validation to tear down
calls prematurely.
Modules Affected res_srtp.c res_rtp_asterisk.c

Resolution Asterisk now implements SRTP replay protection via a
“srtpreplayprotection” option in rtp.conf. The default is
“yes”

Affected Versions
Product Release Series
Asterisk Open Source 13.x 13.38.1
Asterisk Open Source 16.x 16.16.0
Asterisk Open Source 17.x 17.9.1
Asterisk Open Source 18.x 18.2.0
Certified Asterisk 16.x 16.8-cert5

Corrected In
Product Release
Asterisk Open Source 13.38.2, 16.16.1, 17.9.2, 18.2.1
Certified Asterisk 16.8-cert6

Patches
Patch URL Revision
https:/downloads.asterisk.org/pub/security/AST-2021-003-13.diff 13.38.2
https:/downloads.asterisk.org/pub/security/AST-2021-003-16.diff 16.16.1
https:/downloads.asterisk.org/pub/security/AST-2021-003-17.diff 17.9.2
https:/downloads.asterisk.org/pub/security/AST-2021-003-18.diff 18.2.1
https:/downloads.asterisk.org/pub/security/AST-2021-003-16.8.diff Certified
Asterisk
16.8-cert6

Links https://issues.asterisk.org/jira/browse/ASTERISK-29260

https://downloads.asterisk.org/pub/security/AST-2021-003.html

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This document may be superseded by later versions; if so, the latest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-2021-003.pdf and
https://downloads.digium.com/pub/security/AST-2021-003.html

Revision History
Date Editor Revisions Made
February 4, 2021 George Joseph Initial
February 5, 2021 George Joseph Added CVE ID

Asterisk Project Security Advisory - AST-2021-003
Copyright © 2021 Digium, Inc. All Rights Reserved.
Permission is hereby granted to distribute and publish this advisory in its
original, unaltered form.
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