USN-7839-2: Google Guest Agent vulnerability

Publication date

3 November 2025

Overview

Google Guest Agent could allow unintended access to network services.


Packages

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.

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

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

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
25.04 plucky google-guest-agent –  20250116.00-0ubuntu2.1
24.04 LTS noble google-guest-agent –  20250116.00-0ubuntu1~24.04.2
22.04 LTS jammy google-guest-agent –  20250116.00-0ubuntu1~22.04.1
20.04 LTS focal google-guest-agent –  20250116.00-0ubuntu1~20.04.0+esm1  
18.04 LTS bionic google-guest-agent –  20241011.01-0ubuntu1~18.04.0+esm1  
16.04 LTS xenial google-guest-agent –  20240716.00-0ubuntu1~16.04.0+esm1  

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