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

tang vulnerability

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