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[USN-7839-2] Google Guest Agent vulnerability

Posted on 03 November 2025
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-7839-2
November 03, 2025

google-guest-agent vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 25.04
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Google Guest Agent could allow unintended access to network services.

Software Description:
- google-guest-agent: Google Compute Engine Guest Agent

Details:

USN-7839-1 fixed vulnerabilities in Go Cryptography. This update provides
the corresponding update in the Go Cryptography module included in Google
Guest Agent.

Original advisory details:

Damien Tournoud, Patrick Dawkins, Vince Parker, and Jules Duvivier
discovered that Go Cryptography incorrectly handled public keys during SSH
operations. An attacker could possibly use this issue to bypass
authorization mechanisms.

Update instructions:

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

Ubuntu 25.04
google-guest-agent 20250116.00-0ubuntu2.1

Ubuntu 24.04 LTS
google-guest-agent 20250116.00-0ubuntu1~24.04.2

Ubuntu 22.04 LTS
google-guest-agent 20250116.00-0ubuntu1~22.04.1

Ubuntu 20.04 LTS
google-guest-agent 20250116.00-0ubuntu1~20.04.0+esm1
Available with Ubuntu Pro

Ubuntu 18.04 LTS
google-guest-agent 20241011.01-0ubuntu1~18.04.0+esm1
Available with Ubuntu Pro

Ubuntu 16.04 LTS
google-guest-agent 20240716.00-0ubuntu1~16.04.0+esm1
Available with Ubuntu Pro

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

References:
https://ubuntu.com/security/notices/USN-7839-2
https://ubuntu.com/security/notices/USN-7839-1
CVE-2024-45337

Package Information:
https://launchpad.net/ubuntu/+source/google-guest-agent/20250116.00-0ubuntu2.1
https://launchpad.net/ubuntu/+source/google-guest-agent/20250116.00-0ubuntu1~24.04.2
https://launchpad.net/ubuntu/+source/google-guest-agent/20250116.00-0ubuntu1~22.04.1

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