flac123 0.0.9 - Stack overflow in comment parsing

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

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