Ensure there is no unrestricted inbound access to TCP port 5500 (VNC Listener)

Security & Compliance
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TCP port 5500 is used by Virtual Network Computing (VNC) servers to listen for incoming VNC viewer connections. VNC is a graphical desktop sharing system that allows you to remotely control another computer over a network connection. However, if TCP port 5500 is open and accessible to the internet without any restrictions, it can be a major security vulnerability as attackers can exploit it to gain unauthorized access to your computer and sensitive data.


Here are the steps to remediate the issue of unrestricted inbound access to TCP port 5500 (VNC Listener):

  1. Identify open ports: Identify any open TCP ports in your security groups or network access control lists (ACLs) that allow inbound traffic to port 5500 (VNC Listener).
  2. Restrict access: Restrict access to TCP port 5500 (VNC Listener) by modifying the security group rules and network ACLs to allow inbound traffic only from trusted sources. This can be done by adding specific IP addresses or IP address ranges to the allowed list.
  3. Implement VPN: Implement VPN connections to encrypt VNC traffic and prevent interception. VPN connections can help to protect your sensitive data and prevent unauthorized access.
  4. Implement strong authentication: Implement strong authentication mechanisms to prevent unauthorized access to your VNC server. This can be done by requiring strong passwords or implementing multi-factor authentication.
  5. Monitor and update: Regularly monitor your security group rules and network ACLs for changes and update them as needed to ensure that your systems are always protected against unauthorized access through TCP port 5500 (VNC Listener).

By following these remediation steps, you can help to ensure that there is no unrestricted inbound access to TCP port 5500 (VNC Listener), which can help to prevent security breaches and protect your sensitive data.

Enforced Resources
Note: Remediation steps provided by Lightlytics are meant to be suggestions and guidelines only. It is crucial to thoroughly verify and test any remediation steps before applying them to production environments. Each organization's infrastructure and security needs may differ, and blindly applying suggested remediation steps without proper testing could potentially cause unforeseen issues or vulnerabilities. Therefore, it is strongly recommended that you validate and customize any remediation steps to meet your organization's specific requirements and ensure that they align with your security policies and best practices.