Multiple vulnerabilities were discovered and corrected in libtiff:

Buffer overflow in LibTIFF allows remote attackers to execute arbitrary
code or cause a denial of service (application crash) via a crafted
TIFF image with JPEG encoding (CVE-2011-0191).

Heap-based buffer overflow in the thunder (aka ThunderScan) decoder
in tif_thunder.c in LibTIFF 3.9.4 and earlier allows remote attackers
to execute arbitrary code via crafted THUNDER_2BITDELTAS data in a
.tiff file that has an unexpected BitsPerSample value (CVE-2011-1167).

Packages for 2009.0 are provided as of the Extended Maintenance
Program. Please visit this link to learn more:
http://store.mandriva.com/product_info.php?cPath=149&products_id=490

The updated packages have been patched to correct these issues.