=========================================================================Ubuntu Security Notice USN-5227-3
October 24, 2022

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

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

An incomplete fix was discovered in Pillow.

Software Description:
- pillow: Python Imaging Library

Details:

USN-5227-1 fixed vulnerabilities in Pillow. It was discovered that the fix
for CVE-2022-22817 was incomplete. This update fixes the problem.

Original advisory details:

  It was discovered that Pillow incorrectly handled certain image files. If a
  user or automated system were tricked into opening a specially-crafted
  file, a remote attacker could cause Pillow to hang, resulting in a denial
  of service. (CVE-2021-23437)
   It was discovered that Pillow incorrectly handled certain image files. If a
  user or automated system were tricked into opening a specially-crafted
  file, a remote attacker could cause Pillow to crash, resulting in a denial
  of service. This issue ony affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, and
  Ubuntu 21.04. (CVE-2021-34552)
   It was discovered that Pillow incorrectly handled certain image files. If a
  user or automated system were tricked into opening a specially-crafted
  file, a remote attacker could cause Pillow to crash, resulting in a denial
  of service, or possibly execute arbitrary code. (CVE-2022-22815)
   It was discovered that Pillow incorrectly handled certain image files. If a
  user or automated system were tricked into opening a specially-crafted
  file, a remote attacker could cause Pillow to crash, resulting in a denial
  of service. (CVE-2022-22816)
   It was discovered that Pillow incorrectly handled certain image files. If a
  user or automated system were tricked into opening a specially-crafted
  file, a remote attacker could cause Pillow to crash, resulting in a denial
  of service, or possibly execute arbitrary code. (CVE-2022-22817)

Update instructions:

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

Ubuntu 20.04 LTS:
   python3-pil                     7.0.0-4ubuntu0.6

Ubuntu 18.04 LTS:
   python-pil                      5.1.0-1ubuntu0.8
   python3-pil                     5.1.0-1ubuntu0.8

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

References:
   https://ubuntu.com/security/notices/USN-5227-3
   https://ubuntu.com/security/notices/USN-5227-1
   CVE-2022-22817

Package Information:
   https://launchpad.net/ubuntu/+source/pillow/7.0.0-4ubuntu0.6
   https://launchpad.net/ubuntu/+source/pillow/5.1.0-1ubuntu0.8