Juju vulnerable to sensitive log retrieval via authenticated endpoint without authorization in github.com/juju/juju

Open Source Vulnerabilities CVE-2025-53512

The /log endpoint on a Juju controller lacked sufficient authorization checks, allowing unauthorized users to access debug messages that could contain sensitive information.

Open Source Vulnerabilities GO-2025-3806

Juju vulnerable to sensitive log retrieval via authenticated endpoint without authorization in github.com/juju/juju

Open Source Vulnerabilities GHSA-r64v-82fh-xc63

### Impact Any user with a Juju account on a controller can read debug log messages from the `/log` endpoint. No specific permissions are required - it's just sufficient for the user to exist in the controller user database. The log messages may contain sensitive information. ### Details The `/log` endpoint is accessible at the following endpoints: - `wss://<controller-ip>/log` - `wss://<controller-ip>/model/<model-uuid>/log` In order to connect to these endpoints, the client must pass an X-Juju-Client-Version header that matches the current version and pass credentials in a Basic Authorization header. Once connected, the service will stream log events even though the user is not authorised to view them. To reproduce: ``` juju bootstrap juju add-user testuser juju change-user-password testuser ``` Run the [wscat](https://github.com/websockets/wscat) command below to connect to `wss://<controller-ip>:17070/api`. Update the JSON payload to include the username and password that were created above. ``` wscat --no-check -c wss://contorller-ip:17070/model/modelUUID/api { "type": "Admin", "request": "Login", "version": 3, "params": { "client- version": "3.6.1.0", "auth-tag": "user-testuser", "credentials": " password" } } ``` Observe that the connection fails due to a lack of permissions. Run the command below to connect to the log endpoint. Note that the credentials are passed in the --auth flag. ``` wscat --auth user-testuser:password -H "X-Juju-ClientVersion: 3.6.4" --no-check -c wss://<controller-ip>:17070/log ``` Observe that the logs are returned in the server’s response. ### Code The `/log` handlers are registered here https://github.com/juju/juju/blob/3.6/apiserver/apiserver.go#L867 https://github.com/juju/juju/blob/3.6/apiserver/apiserver.go#L980 And the only auth required is that the incoming request be for an authenticated user https://github.com/juju/juju/blob/3.6/apiserver/apiserver.go#L713 but no specific permission checks are done. ### Workarounds There are no workarounds. ### References [F-01](https://drive.google.com/file/d/1pHRNiaA8LyMVJYwIyTqelsqJ9FmImDf0/view)