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

DLA 2694-1: tiff security update

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Debian LTS Advisory DLA-2694-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Thorsten Alteholz
June 28, 2021   https://wiki.debian.org/LTS
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Package : tiff
Version : 4.0.8-2+deb9u6
CVE ID : CVE-2020-35523 CVE-2020-35524

Two vulnerabilities have been discovered in the libtiff library and the
included tools, which may result in denial of service or the execution
of arbitrary code if malformed image files are processed.

For Debian 9 stretch, these problems have been fixed in version
4.0.8-2+deb9u6.

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