libtiff up to 3.7.0 allows remote attackers to cause a denial of service (application crash) via a TIFF image header with a zero "YCbCr subsampling" value, which causes a divide-by-zero error in (1) tif_strip.c and (2) tif_tile.c, a different vulnerability than CVE-2004-0804.
https://bugzilla.ubuntu.com/show_bug.cgi?id=12008
http://www.securityfocus.com/bid/14417
http://www.mandriva.com/security/advisories?name=MDKSA-2005:144
http://www.mandriva.com/security/advisories?name=MDKSA-2005:143
http://www.mandriva.com/security/advisories?name=MDKSA-2005:142