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Asterisk Project Security Advisory - AST-2012-005

Asterisk Project Security Advisory - AST-2012-005
Posted Apr 23, 2012
Authored by Matt Jordan | Site asterisk.org

Asterisk Project Security Advisory - In the Skinny channel driver, KEYPAD_BUTTON_MESSAGE events are queued for processing in a buffer allocated on the heap, where each DTMF value that is received is placed on the end of the buffer. Since the length of the buffer is never checked, an attacker could send sufficient KEYPAD_BUTTON_MESSAGE events such that the buffer is overrun.

tags | advisory, overflow
MD5 | 696a9c6849da6138ccfe67440c3caec9

Asterisk Project Security Advisory - AST-2012-005

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               Asterisk Project Security Advisory - AST-2012-005

Product Asterisk
Summary Heap Buffer Overflow in Skinny Channel Driver
Nature of Advisory Exploitable Heap Buffer Overflow
Susceptibility Remote Authenticated Sessions
Severity Minor
Exploits Known No
Reported On March 26, 2012
Reported By Russell Bryant
Posted On April 23, 2012
Last Updated On April 23, 2012
Advisory Contact Matt Jordan < mjordan AT digium DOT com >
CVE Name

Description In the Skinny channel driver, KEYPAD_BUTTON_MESSAGE events
are queued for processing in a buffer allocated on the
heap, where each DTMF value that is received is placed on
the end of the buffer. Since the length of the buffer is
never checked, an attacker could send sufficient
KEYPAD_BUTTON_MESSAGE events such that the buffer is
overrun.

Resolution The length of the buffer is now checked before appending a
value to the end of the buffer.

Affected Versions
Product Release Series
Asterisk Open Source 1.6.2.x All Versions
Asterisk Open Source 1.8.x All Versions
Asterisk Open Source 10.x All Versions

Corrected In
Product Release
Asterisk Open Source 1.6.2.24, 1.8.11.1, 10.3.1

Patches
SVN URL Revision
http://downloads.asterisk.org/pub/security/AST-2012-005-1.6.2.diff v1.6.2
http://downloads.asterisk.org/pub/security/AST-2012-005-1.8.diff v1.8
http://downloads.asterisk.org/pub/security/AST-2012-005-10.diff v10

Links https://issues.asterisk.org/jira/browse/ASTERISK-19592

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This document may be superseded by later versions; if so, the latest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-2012-005.pdf and
http://downloads.digium.com/pub/security/AST-2012-005.html

Revision History
Date Editor Revisions Made
04/16/2012 Matt Jordan Initial Release

Asterisk Project Security Advisory - AST-2012-005
Copyright (c) 2012 Digium, Inc. All Rights Reserved.
Permission is hereby granted to distribute and publish this advisory in its
original, unaltered form.

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