BugTraq
AST-2017-001: Buffer overflow in CDR's set user Apr 04 2017 02:51PM
Asterisk Security Team (security asterisk org)
Asterisk Project Security Advisory - AST-2017-001

Product Asterisk
Summary Buffer overflow in CDR's set user
Nature of Advisory Buffer Overflow
Susceptibility Remote Authenticated Sessions
Severity Moderate
Exploits Known No
Reported On March 27, 2017
Reported By Alex Villacis Lasso
Posted On
Last Updated On April 4, 2017
Advisory Contact kharwell AT digium DOT com
CVE Name

Description No size checking is done when setting the user field on a
CDR. Thus, it is possible for someone to use an arbitrarily
large string and write past the end of the user field
storage buffer. This allows the possibility of remote code
injection.

This currently affects any system using CDR's that also
make use of the following:

* The 'X-ClientCode' header within a SIP INFO message when
using chan_sip and

the 'useclientcode' option is enabled (note, it's disabled
by default).

* The CDR dialplan function executed from AMI when setting
the user field.

* The AMI Monitor action when using a long file name/path.

Resolution The CDR engine now only copies up to the maximum allowed
characters into the user field. Any characters outside the
maximum are truncated.

Affected Versions
Product Release
Series
Asterisk Open Source 13.x All Releases
Asterisk Open Source 14.x All Releases
Certified Asterisk 13.13 All Releases

Corrected In
Product Release
Asterisk Open Source 13.14.1,14.3.1
Certified Asterisk 13.13-cert3

Patches
SVN URL Revision
http://downloads.asterisk.org/pub/security/AST-2017-001-13.diff Asterisk
13
http://downloads.asterisk.org/pub/security/AST-2017-001-14.diff Asterisk
14
http://downloads.asterisk.org/pub/security/AST-2017-001-13.13.diff Certified
Asterisk
13.13

Links https://issues.asterisk.org/jira/browse/ASTERISK-26897

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This document may be superseded by later versions; if so, the latest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-2017-001.pdf and
http://downloads.digium.com/pub/security/AST-2017-001.html

Revision History
Date Editor Revisions Made
March, 27, 2017 Kevin Harwell Initial Revision

Asterisk Project Security Advisory - AST-2017-001
Copyright © 2017 Digium, Inc. All Rights Reserved.
Permission is hereby granted to distribute and publish this advisory in its
original, unaltered form.

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