GHSA-xv8g-fj9h-6gmv

The linkdave server does not enforce authentication on its REST and WebSocket routes in versions prior to 0.1.5.

Impact

An attacker with network access to the server port can:

• Connect to the WebSocket endpoint (/ws) and receive a valid session_id in the OpReady response.
• Use that session to invoke all REST player controls on any guild corresponding to their session id[1].
• Enumerate server statistics and runtime information via the unauthenticated /stats endpoint (still public after the fix).

1] If on [>=0.1.0, attackers are restricted to creating, controlling and deleting players created within their own session ID.

Vulnerable Routes

The following routes were entirely unauthenticated in >= 0.0.1, < 0.1.5:

| Method | Path | Description |

|--------|------|-------------|

| POST | /sessions/{sessionid}/players/{guildid}/play | Start audio playback |

| POST | /sessions/{sessionid}/players/{guildid}/pause | Pause playback |

| POST | /sessions/{sessionid}/players/{guildid}/resume | Resume playback |

| POST | /sessions/{sessionid}/players/{guildid}/stop | Stop playback |

| POST | /sessions/{sessionid}/players/{guildid}/seek | Seek to position |

| PATCH | /sessions/{sessionid}/players/{guildid}/volume | Set volume |

| DELETE | /sessions/{sessionid}/players/{guildid} | Disconnect from voice channel |

| GET | /ws | WebSocket event stream |

Patches

Update to 0.1.5.

- image: ghcr.io/shi-gg/linkdave:0.1.4
+ image: ghcr.io/shi-gg/linkdave:latest

or

docker pull ghcr.io/shi-gg/linkdave:latest

After upgrading, set the LINKDAVE_PASSWORD environment variable to a strong secret value. If this variable is left unset, the server will still accept all connections without authentication even on >= 0.1.5.

Server configuration (e.g. compose.yml):

environment:
    LINKDAVE_PASSWORD: ${LINKDAVE_PASSWORD}
echo "LINKDAVE_PASSWORD=$(openssl rand -hex 16)" >> .env

To restart the stack, run

docker compose up -d

TypeScript client (0.1.5+):

The client automatically handles authentication. Pass the password when constructing the client:

const linkdave = new LinkDaveClient({
    nodes: [
        {
            name: "main",
            url: process.env.LINKDAVE_URI,
            password: process.env.LINKDAVE_PASSWORD
        }
    ]
});

Workarounds

If upgrading is not immediately possible, restrict network access to the server's port using a firewall so it is only accessible from trusted internal IP addresses.