[oCERT 2008-02] libfishsound insufficient boundary checks

[Andrea Barisani <lcars () ocert org>]

2008/04/06 #2008-02 libfishsound insufficient boundary checks

Description:

The libfishsound decoder library incorrectly implements the reference speex
decoder from the Speex library, performing insufficient boundary checks on a
header structure read from user input.

A user controlled field in the header structure is used to build a function
pointer. The libfishsound implementation does not check for negative values for
the field, allowing the function pointer to be pointed at an arbitary position
in memory. This allows remote code execution.

A patch has been committed to the libfishsound public repository.

Affected version: <= 0.9.0

Fixed version: current svn tree

Additional affected packages:

Illuminable DirectShow Filters for Ogg Vorbis, which statically include the
libfishsound library.

Credit: reporter wishes to remain anonymous

CVE: N/A

Timeline:

2008-04-05: vulnerability report received
2008-04-05: contacted libfishsound maintainers
2008-04-06: upstream maintainer publicly releases patch
2008-04-06: advisory release

References:
http://trac.annodex.net/changeset/3535
http://trac.annodex.net/changeset/3536
http://www.annodex.net/software/libfishsound

Permalink:
http://www.ocert.org/advisories/ocert-2008-2.html

-- 
Andrea Barisani |                Founder & Project Coordinator
          oCERT | Open Source Computer Emergency Response Team

<lcars () ocert org>                         http://www.ocert.org
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