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Asterisk Project Security Advisory - AST-2018-004

Asterisk Project Security Advisory - AST-2018-004
Posted Feb 23, 2018
Authored by Joshua Colp, Sandro Gauci | Site asterisk.org

Asterisk Project Security Advisory - When processing a SUBSCRIBE request the res_pjsip_pubsub module stores the accepted formats present in the Accept headers of the request. This code did not limit the number of headers it processed despite having a fixed limit of 32. If more than 32 Accept headers were present the code would write outside of its memory and cause a crash.

tags | advisory
advisories | CVE-2018-7284
MD5 | f18e104dffba1574edc8eaf43287eb35

Asterisk Project Security Advisory - AST-2018-004

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               Asterisk Project Security Advisory - AST-2018-004

Product Asterisk
Summary Crash when receiving SUBSCRIBE request
Nature of Advisory Remote Crash
Susceptibility Remote Unauthenticated Sessions
Severity Major
Exploits Known No
Reported On January 30, 2018
Reported By Sandro Gauci
Posted On February 21, 2018
Last Updated On February 21, 2018
Advisory Contact Joshua Colp <jcolp AT digium DOT com>
CVE Name CVE-2018-7284

Description When processing a SUBSCRIBE request the res_pjsip_pubsub
module stores the accepted formats present in the Accept
headers of the request. This code did not limit the number
of headers it processed despite having a fixed limit of 32.
If more than 32 Accept headers were present the code would
write outside of its memory and cause a crash.

Resolution The res_pjsip_pubsub module has been changed to enforce a
limit on the maximum number of Accept headers it will
process. To receive this change upgrade to the version of
Asterisk where this is resolved or apply the appropriate
provided patch.

Affected Versions
Product Release Series
Asterisk Open Source 13.x All versions
Asterisk Open Source 14.x All versions
Asterisk Open Source 15.x All versions
Certified Asterisk 13.18 All versions

Corrected In
Product Release
Asterisk Open Source 13.19.2, 14.7.6, 15.2.2
Certified Asterisk 13.18-cert3

Patches
SVN URL Revision
http://downloads.asterisk.org/pub/security/AST-2018-004-13.diff Asterisk
13
http://downloads.asterisk.org/pub/security/AST-2018-004-14.diff Asterisk
14
http://downloads.asterisk.org/pub/security/AST-2018-004-15.diff Asterisk
15
http://downloads.asterisk.org/pub/security/AST-2018-004-13.18.diff Certified
Asterisk
13.18

Links https://issues.asterisk.org/jira/browse/ASTERISK-27640

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-2018-004.pdf and
http://downloads.digium.com/pub/security/AST-2018-004.html

Revision History
Date Editor Revisions Made
February 5, 2018 Joshua Colp Initial Revision
February 21, 2018 Joshua Colp Added CVE

Asterisk Project Security Advisory - AST-2018-004
Copyright A(c) 2018 Digium, Inc. All Rights Reserved.
Permission is hereby granted to distribute and publish this advisory in its
original, unaltered form.

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