[SECURITY] [DLA 1680-1] tiff security update

Package : tiff
Version : 4.0.3-12.3+deb8u8
CVE ID : CVE-2018-17000 CVE-2018-19210 CVE-2019-7663

Brief introduction

CVE-2018-17000

A NULL pointer dereference in the function _TIFFmemcmp at tif_unix.c
(called from TIFFWriteDirectoryTagTransferfunction) allows an
attacker to cause a denial-of-service through a crafted tiff file. This
vulnerability can be triggered by the executable tiffcp.

CVE-2018-19210

There is a NULL pointer dereference in the TIFFWriteDirectorySec function
in tif_dirwrite.c that will lead to a denial of service attack, as
demonstrated by tiffset.

CVE-2019-7663

An Invalid Address dereference was discovered in
TIFFWriteDirectoryTagTransferfunction in libtiff/tif_dirwrite.c,
affecting the cpSeparateBufToContigBuf function in tiffcp.c. Remote
attackers could leverage this vulnerability to cause a denial-of-service
via a crafted tiff file.

We believe this is the same as CVE-2018-17000 (above).

For Debian 8 "Jessie", these problems have been fixed in version
4.0.3-12.3+deb8u8.

We recommend that you upgrade your tiff packages.

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS