Buffer overflow in the readextension function in gif2tiff.c in LibTIFF 4.0.6 allows remote attackers to cause a denial of service (application crash) via a crafted GIF file.Referenceshttps://bugzilla.redhat.com/show_bug.cgi?id=1319503http://lists.opensuse.org/opensuse-updates/2016-04/msg00064.htmlhttps://usn.ubuntu.com/3606-1/https://security.gentoo.org/glsa/201701-16http://www.securitytracker.com/id/1035442http://lists.opensuse.org/opensuse-updates/2016-04/msg00075.htmlhttps://access.redhat.com/errata/RHSA-2019:2053
