A LibTIFF security update has been released for Ubuntu Linux 16.04 LTS, 18.04 LTS, 20.04 LTS, and 20.10.

==========================================================================
Ubuntu Security Notice USN-4755-1
February 25, 2021

tiff vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in LibTIFF.

Software Description:
- tiff: Tag Image File Format (TIFF) library

Details:

It was discovered that LibTIFF incorrectly handled certain malformed
images. If a user or automated system were tricked into opening a specially
crafted image, a remote attacker could crash the application, leading to a
denial of service, or possibly execute arbitrary code with user privileges.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 20.10:
libtiff-tools 4.1.0+git191117-2ubuntu0.20.10.1
libtiff5 4.1.0+git191117-2ubuntu0.20.10.1

Ubuntu 20.04 LTS:
libtiff-tools 4.1.0+git191117-2ubuntu0.20.04.1
libtiff5 4.1.0+git191117-2ubuntu0.20.04.1

Ubuntu 18.04 LTS:
libtiff-tools 4.0.9-5ubuntu0.4
libtiff5 4.0.9-5ubuntu0.4

Ubuntu 16.04 LTS:
libtiff-tools 4.0.6-1ubuntu0.8
libtiff5 4.0.6-1ubuntu0.8

In general, a standard system update will make all the necessary changes.

References:
  https://usn.ubuntu.com/4755-1
CVE-2020-35523, CVE-2020-35524

Package Information:
  https://launchpad.net/ubuntu/+source/tiff/4.1.0+git191117-2ubuntu0.20.10.1
  https://launchpad.net/ubuntu/+source/tiff/4.1.0+git191117-2ubuntu0.20.04.1
  https://launchpad.net/ubuntu/+source/tiff/4.0.9-5ubuntu0.4
  https://launchpad.net/ubuntu/+source/tiff/4.0.6-1ubuntu0.8