A Libksba security update has been released for Ubuntu Linux 14.04 ESM, 16.04 ESM, 18.04 LTS, 20.04 LTS, and 22.04 LTS.

USN-5688-1: Libksba vulnerability

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Ubuntu Security Notice USN-5688-1
October 19, 2022

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

- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM

Summary:

Libksba could be made to crash or run programs if it decoded specially
crafted data.

Software Description:
- libksba: X.509 and CMS support library

Details:

It was discovered that an integer overflow could be triggered in Libksba
when decoding certain data. An attacker could use this issue to cause a
denial of service (application crash) or possibly execute arbitrary code.

Update instructions:

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

Ubuntu 22.04 LTS:
libksba8 1.6.0-2ubuntu0.1

Ubuntu 20.04 LTS:
libksba8 1.3.5-2ubuntu0.20.04.1

Ubuntu 18.04 LTS:
libksba8 1.3.5-2ubuntu0.18.04.1

Ubuntu 16.04 ESM:
libksba8 1.3.3-1ubuntu0.16.04.1+esm1

Ubuntu 14.04 ESM:
libksba8 1.3.0-3ubuntu0.14.04.2+esm1

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

References:
https://ubuntu.com/security/notices/USN-5688-1
CVE-2022-3515

Package Information:
https://launchpad.net/ubuntu/+source/libksba/1.6.0-2ubuntu0.1
https://launchpad.net/ubuntu/+source/libksba/1.3.5-2ubuntu0.20.04.1
https://launchpad.net/ubuntu/+source/libksba/1.3.5-2ubuntu0.18.04.1