Use-after-free vulnerability in the t2p_readwrite_pdf_image function in tools/tiff2pdf.c in libtiff 4.0.3 allows remote attackers to cause a denial of service (crash) or possibly execute arbitrary code via a crafted TIFF image.
https://bugzilla.redhat.com/show_bug.cgi?id=995975
http://www.openwall.com/lists/oss-security/2013/08/10/2
http://www.debian.org/security/2013/dsa-2744
http://www.asmail.be/msg0055359936.html
http://secunia.com/advisories/54628
http://secunia.com/advisories/54543