bugtraq - flac123 0.0.9 - Stack overflow in comment parsing

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Date: Thu, 28 Jun 2007 19:34:02 -0700
From: David Thiel <david@...cpartners.com>
To: bugtraq@...urityfocus.com
Subject: flac123 0.0.9 - Stack overflow in comment parsing

iSEC Partners Security Advisory - 2007-002-flactools
http://www.isecpartners.com
--------------------------------------------

flac123 0.0.9 - Stack overflow in comment parsing

Vendor URL: http://flac-tools.sourceforge.net/
Severity: High (Allows for arbitrary code execution)
Author: David Thiel <david[at]isecpartners[dot]com>

Vendor notified: 2007-06-05
Public release: 2007-06-28
Systems affected: Verified code execution on FreeBSD 6.2 - should affect most 
	systems.
Advisory URL: http://www.isecpartners.com/advisories/2007-002-flactools.txt

Summary:
--------
flac123, also known as flac-tools, is vulnerable to a buffer overflow in
vorbis comment parsing. This allows for the execution of arbitrary code.

Details:
--------
The function local__vcentry_parse_value() in vorbiscomment.c does not
correctly handle a long value_length, causing it to overflow the buffer
"dest" during memcpy().

Fix Information:
----------------
This is the sole issue corrected in version 0.0.10.

Thanks to:
----------
Dan Johnson for quickly producing the fixed version.

About iSEC Partners:
--------------------
iSEC Partners is a full-service security consulting firm that provides
penetration testing, secure systems development, security education
and software design verification.

More information on exploiting media players and codecs and tools to do
the same will be presented at BlackHat USA 2007.

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San Francisco, CA 94104
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