A tiff security update has been released for Debian GNU/Linux 9 LTS to address two security issues.

DLA 2777-1: tiff security update

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Debian LTS Advisory DLA-2777-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Utkarsh Gupta
October 03, 2021   https://wiki.debian.org/LTS
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Package : tiff
Version : 4.0.8-2+deb9u7
CVE ID : CVE-2020-19131 CVE-2020-19144

Two security issues were found in TIFF, a widely used format for
storing image data, as follows:

CVE-2020-19131

Buffer Overflow in LibTiff allows attackers to cause
a denial of service via the "invertImage()" function
in the component "tiffcrop".

CVE-2020-19144

Buffer Overflow in LibTiff allows attackers to cause
a denial of service via the 'in _TIFFmemcpy' funtion
in the component 'tif_unix.c'.

For Debian 9 stretch, these problems have been fixed in version
4.0.8-2+deb9u7.

We recommend that you upgrade your tiff packages.

For the detailed security status of tiff please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/tiff

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