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The linkdave HTTP server, up to version 1.2.4, fails to enforce any authentication mechanism on its REST and WebSocket endpoints. These endpoints are designed to handle configuration, status updates, and real-time communication. Due to the missing authentication checks, any remote attacker who can reach the server can directly interact with these interfaces without providing credentials. For REST endpoints, this means an attacker can send GET, POST, PUT, or DELETE requests to manipulate server state, access sensitive data, or trigger actions. For WebSocket endpoints, an attacker can establish a persistent connection to receive real-time updates or send commands that the server would otherwise restrict to authenticated users. The vulnerability exists because the server’s routing logic does not include any middleware or filter to verify the user’s identity before processing requests. This is particularly critical when the server is exposed to the internet, as it becomes an open door for malicious actors. The endpoints may include administrative functions, database interactions, or control interfaces for connected devices. Exploitation requires no special privileges or prior knowledge, only network connectivity to the server. The issue is tracked in the GitHub Advisory Database and has been assigned a critical severity rating due to the complete lack of access control. Patches are available in version 1.2.5, which introduces mandatory authentication for all sensitive routes. Users are urged to upgrade immediately or implement network-level restrictions as a temporary measure.
Platform: linkdave
Version: <1.2.5
Vulnerability: Missing Authentication
Severity: Critical
Date: 2026-03-08
Prediction: Patched 2026-03-10
What Undercode Say:
Check if REST endpoints are accessible without authentication
curl -v http://target.linkdave:8080/api/status
Attempt to modify configuration
curl -X POST http://target.linkdave:8080/api/config -d '{"setting":"malicious"}'
Connect to WebSocket endpoint using websocat
websocat ws://target.linkdave:8080/ws
Example Python script to interact with WebSocket
import asyncio
import websockets
async def test():
async with websockets.connect("ws://target.linkdave:8080/ws") as ws:
await ws.send("get_status")
response = await ws.recv()
print(response)
asyncio.run(test())
Exploit:
An attacker can exploit this by simply sending HTTP requests to any exposed REST endpoint or opening a WebSocket connection to the server. No authentication tokens or session cookies are required. For instance, if the server exposes an endpoint `/api/users` that returns user data, an attacker can retrieve it via `curl http://target/api/users`. Similarly, if a WebSocket endpoint broadcasts sensor data, the attacker can listen in. In more severe cases, if the server allows command execution via an endpoint, the attacker can execute arbitrary system commands.
Protection from this CVE:
- Upgrade to linkdave version 1.2.5 or later, which introduces authentication checks on all REST and WebSocket endpoints.
- If immediate upgrade is not possible, restrict network access to the server using firewalls or VPNs, ensuring only trusted IPs can reach the server.
- Place the server behind a reverse proxy that enforces authentication before forwarding requests to linkdave.
- Disable any unnecessary endpoints or features until the patch can be applied.
Impact:
Unauthenticated remote attackers can gain full access to the linkdave server’s functionality. This may lead to data leakage (sensitive information from REST endpoints), data manipulation (changing configurations), denial of service (by sending malicious commands), or even remote code execution if the server exposes endpoints that invoke system commands. The severity is critical as it compromises the confidentiality, integrity, and availability of the application and its underlying system.
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Sources:
Reported By: github.com
Extra Source Hub:
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