BugTraq
AST-2013-006: Buffer Overflow when receiving odd length 16 bit SMS message Dec 16 2013 10:39PM
Asterisk Security Team (security asterisk org)
Asterisk Project Security Advisory - AST-2013-006

Product Asterisk
Summary Buffer Overflow when receiving odd length 16 bit SMS
message
Nature of Advisory Buffer Overflow and Remote Crash
Susceptibility Remote SMS Messages
Severity Major
Exploits Known None
Reported On September 26, 2013
Reported By Jan Juergens
Posted On December 16, 2013
Last Updated On December 16, 2013
Advisory Contact Scott Griepentrog <sgriepentrog AT digium DOT com>
CVE Name Pending

Description A 16 bit SMS message that contains an odd message length
value will cause the message decoding loop to run forever.
The message buffer is not on the stack but will be
overflowed resulting in corrupted memory and an immediate
crash.

Resolution This patch corrects the evaluation of the message length
indicator, ensuring that the message decoding loop will stop
at the end of the received message.

Thanks to Jan Juergens for finding, reporting, testing, and
providing a fix for this problem.

Affected Versions
Product Release Series
Asterisk Open Source 1.8.x All Versions
Asterisk Open Source 10.x All Versions
Asterisk with Digiumphones 10.x-digiumphones All Versions
Asterisk Open Source 11.x All Versions
Certified Asterisk 1.8.x All Versions
Certified Asterisk 11.x All Versions

Corrected In
Product Release
Asterisk Open Source 1.8.24.1, 10.12.4, 11.6.1
Asterisk with Digiumphones 10.12.4-digiumphones
Certified Asterisk 1.8.15-cert4, 11.2-cert3

Patches
SVN URL Revision
http://downloads.asterisk.org/pub/security/AST-2013-006-1.8.diff Asterisk 1.8
http://downloads.asterisk.org/pub/security/AST-2013-006-10.diff Asterisk 10
http://downloads.asterisk.org/pub/security/AST-2013-006-10-digiumphones.
diff Asterisk
10-digiumphones
http://downloads.asterisk.org/pub/security/AST-2013-006-11.diff Asterisk 11
http://downloads.asterisk.org/pub/security/AST-2013-006-1.8.15.diff Certified
Asterisk 1.8.15
http://downloads.asterisk.org/pub/security/AST-2013-006-11.2.diff Certified
Asterisk 11.2

Links https://issues.asterisk.org/jira/browse/ASTERISK-22590

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This document may be superseded by later versions; if so, the latest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-2013-006.pdf and
http://downloads.digium.com/pub/security/AST-2013-006.html

Revision History
Date Editor Revisions Made
12/16/2013 Scott Griepentrog Initial Revision

Asterisk Project Security Advisory - AST-2013-006
Copyright (c) 2013 Digium, Inc. All Rights Reserved.
Permission is hereby granted to distribute and publish this advisory in its
original, unaltered form.

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