CVE-2018-17000

Name	CVE-2018-17000
Description	A NULL pointer dereference in the function _TIFFmemcmp at tif_unix.c (called from TIFFWriteDirectoryTagTransferfunction) in LibTIFF 4.0.9 allows an attacker to cause a denial-of-service through a crafted tiff file. This vulnerability can be triggered by the executable tiffcp.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
References	DLA-1680-1, DSA-4670-1
NVD severity	medium
Debian Bugs	908778

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
tiff (PTS)	stretch (security), stretch	4.0.8-2+deb9u5	fixed
	buster, buster (security)	4.1.0+git191117-2~deb10u1	fixed
	bullseye, sid	4.2.0-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Origin	Debian Bugs
tiff	source	jessie	4.0.3-12.3+deb8u8	DLA-1680-1
tiff	source	stretch	4.0.8-2+deb9u5	DSA-4670-1
tiff	source	(unstable)	4.0.10-4		908778
tiff3	source	(unstable)	(unfixed)

Notes

http://bugzilla.maptools.org/show_bug.cgi?id=2811
Relates to http://bugzilla.maptools.org/show_bug.cgi?id=2833
Fixed by: https://gitlab.com/libtiff/libtiff/commit/802d3cbf3043be5dce5317e140ccb1c17a6a2d39