[oCERT-2009-012] libtiff tools integer overflows

#2009-012 libtiff tools integer overflows


The libtiff image library tools suffer from integer overflows which may lead to
a potentially exploitable heap overflow and result in arbitrary code execution.

The libtiff package ships a library, for reading and writing TIFF, as well as a
small collection of tools for manipulating TIFF images. The cvt_whole_image
function used in the tiff2rgba tool and the tiffcvt function used in the
rgb2ycbcr tool do not properly validate the width and height of the image.
Specific TIFF images with large width and height can be crafted to trigger the

A patch has been made available by the maintainer and further improved by Tom
Lane of Red Hat.

Affected version:

libtiff <= 3.8.2, <= 3.9 (stable), <= 4.0 (development)

Fixed version:

libtiff, N/A (patch has been made available and its expected to be committed
to libtiff CVS)

Credit: vulnerability report and PoC code received from Tielei Wang <wangtielei
        [at] icst [dot] pku [dot] edu [dot] cn>, ICST-ERCIS.

CVE: CVE-2009-2347


2009-05-22: vulnerability report received
2009-05-22: contacted libtiff maintainer
2009-06-30: report resent to maintainer due to lack of response
2009-07-01: maintainer provides patch
2009-07-04: reporter confirm fixes
2009-07-04: oCERT requests one week embargo for vendor notification
2009-07-04: maintainer confirms embargo
2009-07-07: contacted affected vendors
2009-07-07: assigned CVE
2009-07-07: improved patch contributed by Tom Lane of Red Hat
2009-07-04: reporter acknowledges patch
2009-07-13: advisory release



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

<lcars@ocert.org>                         http://www.ocert.org
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