Port 4000 – REMOTEANYTHING (RemoteAnything)

Why It’s Open

Port 4000 is commonly used by RemoteAnything remote access software, development web servers (like Ruby on Rails, Node.js applications), Diablo 2 game servers, and various network management tools. It’s a popular choice for web development environments and is often used for hosting applications during development and testing phases.

Common Risks

• Unsecured development servers
  Development applications may lack proper security controls
• Remote access exploitation
  RemoteAnything and similar tools may have weak authentication
• Information disclosure
  Debug information and source code may be exposed
• Default credentials
  Development environments often use weak default passwords
• Game server exploits
  Gaming servers may have known vulnerabilities
• Web application vulnerabilities
  Unpatched web frameworks and applications
• Session hijacking
  Insecure session management in web applications

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Enumeration & Testing

Service Detection:

nmap -sV -p 4000

Banner Grabbing:

nc  4000

Vulnerability Scan:

nmap --script vuln -p 4000

What to Look For

Mitigation

• Keep software updated
  Apply latest security patches
• Strong authentication
  Use complex passwords and 2FA
• Access restrictions
  Limit service to trusted networks
• Monitor activity
  Log and review service usage
• Disable if unused
  Remove unnecessary services

TL;DR

• Port 4000 = RemoteAnything/Development servers with weak security controls
• Protocol: TCP
• Used for: Remote access software and development environments
• Security focus: High-risk remote access requiring strict controls

Known CVEs and Exploits

• CVE-2005-0469 – Authentication bypass in RemoteAnything.
• CVE-2005-0470 – Remote code execution (RCE) in RemoteAnything.
• CVE-2005-0471– Buffer overflow in RemoteAnything.