A Cloud-init security update has been released for Ubuntu Linux 16.04 ESM, 18.04 LTS, 20.04 LTS, 22.04 LTS, 22.10, and 23.04.

USN-6042-1: Cloud-init vulnerability

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Ubuntu Security Notice USN-6042-1
April 26, 2023

cloud-init vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 23.04
- Ubuntu 22.10
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 ESM

Summary:

cloud-init could write sensitive information to logs.

Software Description:
- cloud-init: initialization and customization tool for cloud instances

Details:

James Glovich discovered that sensitive data could be exposed in logs. An
attacker could use this information to find hashed passwords and possibly
escalate their privilege.

Update instructions:

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

Ubuntu 23.04:
cloud-init 23.1.2-0ubuntu0~23.04.1

Ubuntu 22.10:
cloud-init 23.1.2-0ubuntu0~22.10.1

Ubuntu 22.04 LTS:
cloud-init 23.1.2-0ubuntu0~22.04.1

Ubuntu 20.04 LTS:
cloud-init 23.1.2-0ubuntu0~20.04.1

Ubuntu 18.04 LTS:
cloud-init 23.1.2-0ubuntu0~18.04.1

Ubuntu 16.04 ESM:
cloud-init 21.1-19-gbad84ad4-0ubuntu1~16.04.4

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

References:
  https://ubuntu.com/security/notices/USN-6042-1
CVE-2023-1786,   https://bugs.launchpad.net/cloud-init/+bug/2013967

Package Information:
  https://launchpad.net/ubuntu/+source/cloud-init/23.1.2-0ubuntu0~23.04.1
  https://launchpad.net/ubuntu/+source/cloud-init/23.1.2-0ubuntu0~22.10.1
  https://launchpad.net/ubuntu/+source/cloud-init/23.1.2-0ubuntu0~22.04.1
  https://launchpad.net/ubuntu/+source/cloud-init/23.1.2-0ubuntu0~20.04.1
  https://launchpad.net/ubuntu/+source/cloud-init/23.1.2-0ubuntu0~18.04.1