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Asterisk Project Security Advisory - AST-2013-001

Asterisk Project Security Advisory - AST-2013-001
Posted Mar 28, 2013
Authored by Jonathan Rose | Site asterisk.org

Asterisk Project Security Advisory - The format attribute resource for h264 video performs an unsafe read against a media attribute when parsing the SDP. The vulnerable parameter can be received as strings of an arbitrary length and Asterisk attempts to read them into limited buffer spaces without applying a limit to the number of characters read. If a message is formed improperly, this could lead to an attacker being able to execute arbitrary code remotely.

tags | advisory, arbitrary
advisories | CVE-2013-2685
MD5 | 2f1e20b7186fbfd0411b4581c2fd8e8e

Asterisk Project Security Advisory - AST-2013-001

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               Asterisk Project Security Advisory - AST-2013-001

Product Asterisk
Summary Buffer Overflow Exploit Through SIP SDP Header
Nature of Advisory Exploitable Stack Buffer Overflow
Susceptibility Remote Unauthenticated Sessions
Severity Major
Exploits Known No
Reported On 6 January, 2013
Reported By Ulf Ha:rnhammar
Posted On 27 March, 2013
Last Updated On March 27, 2013
Advisory Contact Jonathan Rose <jrose AT digium DOT com>
CVE Name CVE-2013-2685

Description The format attribute resource for h264 video performs an
unsafe read against a media attribute when parsing the SDP.
The vulnerable parameter can be received as strings of an
arbitrary length and Asterisk attempts to read them into
limited buffer spaces without applying a limit to the
number of characters read. If a message is formed
improperly, this could lead to an attacker being able to
execute arbitrary code remotely.

Resolution Attempts to read string data into the buffers noted are now
explicitly limited by the size of the buffers.

Affected Versions
Product Release Series
Asterisk Open Source 11.x All Versions

Corrected In
Product Release
Asterisk Open Source 11.2.2

Patches
SVN URL Revision
Http://downloads.asterisk.org/pub/security/AST-2013-001-11.diff Asterisk
11

Links https://issues.asterisk.org/jira/browse/ASTERISK-20901

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This document may be superseded by later versions; if so, the latest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-2013-001.pdf and
http://downloads.digium.com/pub/security/AST-2013-001.html

Revision History
Date Editor Revisions Made
February 11, 2013 Jonathan Rose Initial Draft
March 27, 2013 Matt Jordan CVE Added

Asterisk Project Security Advisory - AST-2013-001
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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