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

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Ubuntu Security Notice USN-4697-1
January 18, 2021

pillow vulnerabilities
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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:

Pillow could be made to crash or run programs as your login if it opened a
specially crafted file.

Software Description:
- pillow: Python Imaging Library

Details:

It was discovered that Pillow incorrectly handled certain PCX image files.
If a user or automated system were tricked into opening a specially-crafted
PCX file, a remote attacker could possibly cause Pillow to crash,
resulting in a denial of service. (CVE-2020-35653)

It was discovered that Pillow incorrectly handled certain Tiff image files.
If a user or automated system were tricked into opening a specially-crafted
Tiff file, a remote attacker could cause Pillow to crash, resulting in a
denial of service, or possibly execute arbitrary code. This issue only
affected Ubuntu 20.04 LTS and Ubuntu 20.10. (CVE-2020-35654)

It was discovered that Pillow incorrectly handled certain SGI image files.
If a user or automated system were tricked into opening a specially-crafted
SGI file, a remote attacker could possibly cause Pillow to crash,
resulting in a denial of service. This issue only affected Ubuntu 18.04
LTS, Ubuntu 20.04 LTS, and Ubuntu 20.10. (CVE-2020-35655)

Update instructions:

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

Ubuntu 20.10:
python3-pil 7.2.0-1ubuntu0.1

Ubuntu 20.04 LTS:
python3-pil 7.0.0-4ubuntu0.2

Ubuntu 18.04 LTS:
python-pil 5.1.0-1ubuntu0.4
python3-pil 5.1.0-1ubuntu0.4

Ubuntu 16.04 LTS:
python-pil 3.1.2-0ubuntu1.5
python3-pil 3.1.2-0ubuntu1.5

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

References:
  https://usn.ubuntu.com/4697-1
CVE-2020-35653, CVE-2020-35654, CVE-2020-35655

Package Information:
  https://launchpad.net/ubuntu/+source/pillow/7.2.0-1ubuntu0.1
  https://launchpad.net/ubuntu/+source/pillow/7.0.0-4ubuntu0.2
  https://launchpad.net/ubuntu/+source/pillow/5.1.0-1ubuntu0.4
  https://launchpad.net/ubuntu/+source/pillow/3.1.2-0ubuntu1.5