Two integer overflow flaws, leading to heap-based buffer overflows, were found in the way libtiff attempted to allocate space for a tile in a TIFF image file. An attacker could use these flaws to create a specially-crafted TIFF file that, when opened, would cause an application linked against libtiff to crash or, possibly, execute arbitrary code. (CVE-2012-1173 __)
Run yum update libtiff to update your system.
i686: libtiff-debuginfo-3.9.4-5.8.amzn1.i686 libtiff-3.9.4-5.8.amzn1.i686 libtiff-static-3.9.4-5.8.amzn1.i686 libtiff-devel-3.9.4-5.8.amzn1.i686 src: libtiff-3.9.4-5.8.amzn1.src x86_64: libtiff-static-3.9.4-5.8.amzn1.x86_64 libtiff-debuginfo-3.9.4-5.8.amzn1.x86_64 libtiff-devel-3.9.4-5.8.amzn1.x86_64 libtiff-3.9.4-5.8.amzn1.x86_64