A Tang security update has been released for Ubuntu Linux 18.04 LTS, 20.04 LTS, 22.04 LTS, and 23.04.

[USN-6489-1] Tang vulnerability

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Ubuntu Security Notice USN-6489-1
November 20, 2023

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

- Ubuntu 23.04
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS (Available with Ubuntu Pro)

Summary:

Tang could allow unintended access to secret keys.

Software Description:
- tang: network-based cryptographic binding server

Details:

Brian McDermott discovered that Tang incorrectly handled permissions when
creating/rotating keys. A local attacker could possibly use this issue to
read the keys.

Update instructions:

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

Ubuntu 23.04:
  tang-common                     11-2ubuntu0.1

Ubuntu 22.04 LTS:
  tang-common                     11-1ubuntu0.1

Ubuntu 20.04 LTS:
  tang                            7-1ubuntu0.2

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
  tang                            6-1ubuntu0.1~esm1

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

References:
  https://ubuntu.com/security/notices/USN-6489-1
  CVE-2023-1672

Package Information:
  https://launchpad.net/ubuntu/+source/tang/11-2ubuntu0.1
  https://launchpad.net/ubuntu/+source/tang/11-1ubuntu0.1
  https://launchpad.net/ubuntu/+source/tang/7-1ubuntu0.2