An issue was discovered in LibTIFF 4.0.9. There are two out-of-bounds writes in cpTags in tools/tiff2bw.c and tools/pal2rgb.c, which can cause a denial of service (application crash) or possibly have unspecified other impact via a crafted image file.
bugzilla.maptools.org/show_bug.cgi?id=2807
www.securityfocus.com/bid/105370
access.redhat.com/errata/RHSA-2019:2053
gitlab.com/libtiff/libtiff/merge_requests/33/diffs?commit_id=f1b94e8a3ba49febdd3361c0214a1d1149251577
lists.debian.org/debian-lts-announce/2018/10/msg00019.html
usn.ubuntu.com/3864-1/
usn.ubuntu.com/3906-2/
www.debian.org/security/2018/dsa-4349