A libjpeg-turbo security update has been released for Ubuntu Linux 18.04 LTS and 20.04 LTS.

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Ubuntu Security Notice USN-5631-1
September 22, 2022

libjpeg-turbo vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in libjpeg-turbo.

Software Description:
- libjpeg-turbo: library for handling JPEG files

Details:

It was discovered that libjpeg-turbo incorrectly handled certain EOF
characters. An attacker could possibly use this issue to cause
libjpeg-turbo to consume resource, leading to a denial of service. This
issue only affected Ubuntu 18.04 LTS. (CVE-2018-11813)

It was discovered that libjpeg-turbo incorrectly handled certain malformed
jpeg files. An attacker could possibly use this issue to cause
libjpeg-turbo to crash, resulting in a denial of service. (CVE-2020-17541,
CVE-2020-35538)

It was discovered that libjpeg-turbo incorrectly handled certain malformed
PPM files. An attacker could use this issue to cause libjpeg-turbo to
crash, resulting in a denial of service, or possibly execute arbitrary
code. This issue only affected Ubuntu 20.04 LTS. (CVE-2021-46822)

Update instructions:

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

Ubuntu 20.04 LTS:
libjpeg-turbo8 2.0.3-0ubuntu1.20.04.3
libturbojpeg 2.0.3-0ubuntu1.20.04.3

Ubuntu 18.04 LTS:
libjpeg-turbo8 1.5.2-0ubuntu5.18.04.6
libturbojpeg 1.5.2-0ubuntu5.18.04.6

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

References:
  https://ubuntu.com/security/notices/USN-5631-1
CVE-2018-11813, CVE-2020-17541, CVE-2020-35538, CVE-2021-46822

Package Information:
  https://launchpad.net/ubuntu/+source/libjpeg-turbo/2.0.3-0ubuntu1.20.04.3
  https://launchpad.net/ubuntu/+source/libjpeg-turbo/1.5.2-0ubuntu5.18.04.6