The TIFFYCbCrtoRGB function in LibTIFF 3.9.0 and 3.9.2, as used in ImageMagick, does not properly handle invalid ReferenceBlackWhite values, which allows remote attackers to cause a denial of service (application crash) via a crafted TIFF image that triggers an array index error, related to "downsampled OJPEG input."
http://blackberry.com/btsc/KB27244
http://bugzilla.maptools.org/show_bug.cgi?id=2208
http://marc.info/?l=oss-security&m=127731610612908&w=2
http://secunia.com/advisories/40422
http://secunia.com/advisories/40527
http://secunia.com/advisories/50726
http://security.gentoo.org/glsa/glsa-201209-02.xml
http://www.debian.org/security/2012/dsa-2552
http://www.redhat.com/support/errata/RHSA-2010-0519.html