An EC2 hibagent update has been released for Ubuntu Linux 18.04 LTS.

[USN-6519-1] EC2 hibagent update

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Ubuntu Security Notice USN-6519-1
November 28, 2023

ec2-hibinit-agent update
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS (Available with Ubuntu Pro)

Summary:

A security improvement was added to EC2 hibagent.

Software Description:
- ec2-hibinit-agent: Amazon EC2 hibernation agent

Details:

The EC2 hibagent package has been updated to add IMDSv2 support, as IMDSv1
uses an insecure protocol and is no longer recommended.

Update instructions:

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

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
ec2-hibinit-agent 1.0.0-0ubuntu4~18.04.6+esm1

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

References:
https://ubuntu.com/security/notices/USN-6519-1
https://launchpad.net/bugs/1941785