Exploit the possiblities

Asterisk Project Security Advisory - AST-2017-006

Asterisk Project Security Advisory - AST-2017-006
Posted Aug 31, 2017
Authored by Richard Mudgett, Corey Farrell | Site asterisk.org

Asterisk Project Security Advisory - The app_minivm module has an externnotify program configuration option that is executed by the MinivmNotify dialplan application. The application uses the caller-id name and number as part of a built string passed to the OS shell for interpretation and execution. Since the caller-id name and number can come from an untrusted source, a crafted caller-id name or number allows an arbitrary shell command injection.

tags | advisory, arbitrary, shell
MD5 | 748567bf154dce3a594d7969b1e1b697

Asterisk Project Security Advisory - AST-2017-006

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               Asterisk Project Security Advisory - AST-2017-006

Product Asterisk
Summary Shell access command injection in app_minivm
Nature of Advisory Unauthorized command execution
Susceptibility Remote Authenticated Sessions
Severity Moderate
Exploits Known No
Reported On July 1, 2017
Reported By Corey Farrell
Posted On
Last Updated On July 11, 2017
Advisory Contact Richard Mudgett <rmudgett AT digium DOT com>
CVE Name

Description The app_minivm module has an aexternnotifya program
configuration option that is executed by the MinivmNotify
dialplan application. The application uses the caller-id
name and number as part of a built string passed to the OS
shell for interpretation and execution. Since the caller-id
name and number can come from an untrusted source, a
crafted caller-id name or number allows an arbitrary shell
command injection.

Resolution Patched Asteriskas app_minivm module to use a different
system call that passes argument strings in an array instead
of having the OS shell determine the application parameter
boundaries.

Affected Versions
Product Release
Series
Asterisk Open Source 11.x All releases
Asterisk Open Source 13.x All releases
Asterisk Open Source 14.x All releases
Certified Asterisk 11.6 All releases
Certified Asterisk 13.13 All releases

Corrected In
Product Release
Asterisk Open Source 11.25.2, 13.17.1, 14.6.1
Certified Asterisk 11.6-cert17, 13.13-cert5

Patches
SVN URL Revision
http://downloads.asterisk.org/pub/security/AST-2017-006-11.diff Asterisk
11
http://downloads.asterisk.org/pub/security/AST-2017-006-13.diff Asterisk
13
http://downloads.asterisk.org/pub/security/AST-2017-006-14.diff Asterisk
14
http://downloads.asterisk.org/pub/security/AST-2017-006-11.6.diff Certified
Asterisk
11.6
http://downloads.asterisk.org/pub/security/AST-2017-006-13.13.diff Certified
Asterisk
13.13

Links https://issues.asterisk.org/jira/browse/ASTERISK-27103

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-2017-006.pdf and
http://downloads.digium.com/pub/security/AST-2017-006.html

Revision History
Date Editor Revisions Made
July 11, 2017 Richard Mudgett Initial document created

Asterisk Project Security Advisory - AST-2017-006
Copyright A(c) 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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