1. Introduction
KiSS PC-Link Server Detection (UDP) identifies a multimedia streaming service listening on your network. This software is used for streaming videos, music and pictures to KiSS players. An attacker could use this port to discover the server when searching for a PC-Link server. Confidentiality, integrity, and availability may be impacted if an unauthorised user gains access.
2. Technical Explanation
The vulnerability occurs because the PC-Link Server is running and listening on UDP ports. This allows anyone on the network to discover its presence. An attacker could then attempt to exploit vulnerabilities in the server software itself, or use it as a pivot point for further attacks. There are no known CVEs associated with this detection; however, Nessus ID 67272d9e identifies this service.
- Root cause: The PC-Link Server is running and accessible on the network without restriction.
- Exploit mechanism: An attacker sends a UDP broadcast to discover available PC-Link servers. If found, they may attempt further exploitation of the server software or connected clients.
- Scope: Systems running the KiSS PC-Link Server software are affected.
3. Detection and Assessment
You can confirm if a system is vulnerable by checking for the listening service and its version. A thorough method involves using a network scanner.
- Quick checks: Use
netstat -an | findstr ":5000"(replace 5000 with the port number in use) to check if the server is listening on UDP port 5000. - Scanning: Nessus scan ID 67272d9e can detect this service.
- Logs and evidence: Check firewall logs for traffic to/from UDP port 5000.
netstat -an | findstr ":5000"4. Solution / Remediation Steps
Follow these steps to remediate the vulnerability.
4.1 Preparation
- Ensure you have a rollback plan in case of issues. Reverting the configuration or restoring from backup will return the server to its previous state.
- Changes should be made during a scheduled maintenance window with appropriate approvals.
4.2 Implementation
- Step 1: Disable the PC-Link Server service if it is not required. Open Services (services.msc) and locate the “KiSS PC-Link Server” service. Right-click and select ‘Stop’. Then right click again, select ‘Properties’ and change Startup type to ‘Disabled’.
- Step 2: If you need to keep the service running, restrict access using your firewall. Block incoming UDP traffic to port 5000 (or the configured PC-Link Server port) from untrusted sources.
4.3 Config or Code Example
Before
netstat -an | findstr ":5000" (shows service listening)After
netstat -an | findstr ":5000" (shows no service listening)4.4 Security Practices Relevant to This Vulnerability
List only practices that directly address this vulnerability type. Use neutral wording and examples instead of fixed advice. For example: least privilege, input validation, safe defaults, secure headers, patch cadence. If a practice does not apply, do not include it.
- Practice 1: Least Privilege – Only run services that are absolutely necessary, and with the minimum required permissions.
- Practice 2: Network Segmentation – Isolate sensitive services on separate network segments to limit exposure.
4.5 Automation (Optional)
# PowerShell example to disable the service
Stop-Service -Name "KiSS PC-Link Server" -Force
Set-Service -Name "KiSS PC-Link Server" -StartupType Disabled
5. Verification / Validation
Confirm that the fix has been applied and the service is no longer accessible.
- Post-fix check: Run
netstat -an | findstr ":5000". The output should be empty, indicating the service is not listening on port 5000. - Re-test: Re-run the Nessus scan ID 67272d9e to confirm it no longer detects the vulnerability.
- Smoke test: Verify that any legitimate applications relying on this service are still functioning as expected (if applicable).
- Monitoring: Monitor firewall logs for any unexpected traffic to port 5000, which could indicate a regression or attempted access.
netstat -an | findstr ":5000" (should return no results)6. Preventive Measures and Monitoring
Suggest only measures that are relevant to the vulnerability type. Use “for example” to keep advice conditional, not prescriptive.
- Baselines: Update your security baseline or policy to include a requirement for disabling unnecessary services.
- Pipelines: Implement automated checks in your CI/CD pipeline to ensure only approved software is deployed and that unnecessary services are disabled by default.
- Asset and patch process: Regularly review the list of running services on all systems to identify and disable unused or unneeded applications.
7. Risks, Side Effects, and Roll Back
- Risk or side effect 1: Disabling the PC-Link Server may impact users who rely on it for streaming media.
- Risk or side effect 2: Blocking port 5000 could interfere with other applications if they are using the same port.
- Roll back: Step 1: Re-enable the “KiSS PC-Link Server” service in Services (services.msc) and set Startup type to ‘Automatic’. Step 2: If you blocked port 5000, remove the firewall rule.
8. References and Resources
- Vendor advisory or bulletin: http://kissdx.vidartysse.net/
- NVD or CVE entry: http://www.nessus.org/u?67272d9e