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TITLE:
LibTIFF tiff2rgba and rgb2ycbcr Integer Overflow Vulnerabilities

SECUNIA ADVISORY ID:
SA35817

VERIFY ADVISORY:
http://secunia.com/advisories/35817/

DESCRIPTION:
Some vulnerabilities have been reported in LibTIFF, which can be
exploited by malicious people to potentially compromise a user's
system.

1) An integer overflow error within the "tiffcvt()" function included
in the rgb2ycbcr utility can be exploited to cause a heap-based buffer
overflow via a specially crafted TIFF image.

2) An integer overflow error within the "cvt_whole_image()" function
included in the tiff2rgba utility can be exploited to cause
heap-based buffer overflow via a specially crafted TIFF image.

Successful exploitation of the vulnerabilities may allow execution of
arbitrary code.

The vulnerabilities are reported in version 3.8.2. Other versions may
also be affected.

SOLUTION:
Do not process untrusted TIFF files with the rgb2ycbcr and tiff2rgba
programs.

PROVIDED AND/OR DISCOVERED BY:
Tielei Wang of ICST-ERCIS, reported via oCERT

ORIGINAL ADVISORY:
oCERT:
http://www.ocert.org/advisories/ocert-2009-012.html

LibTIFF bug report:
http://bugzilla.maptools.org/show_bug.cgi?id=2079

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