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Ubuntu Security Notice USN-5227-2
January 17, 2022

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

- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM

Summary:

Several security issues were fixed in Pillow.

Software Description:
- pillow: Python Imaging Library

Details:

USN-5227-1 fixed several vulnerabilities in Pillow. This update provides
the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.

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 16.04 ESM:
  python-pil                      3.1.2-0ubuntu1.6+esm1
  python3-pil                     3.1.2-0ubuntu1.6+esm1

Ubuntu 14.04 ESM:
  python-pil                      2.3.0-1ubuntu3.4+esm3
  python3-pil                     2.3.0-1ubuntu3.4+esm3

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

References:
  https://ubuntu.com/security/notices/USN-5227-2
  https://ubuntu.com/security/notices/USN-5227-1
  CVE-2021-23437, CVE-2021-34552, CVE-2022-22815, CVE-2022-22816,
  CVE-2022-22817