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Port 8099 – HTTP-ALT (HTTP Alternative)

Service:

http-alt

Protocol:

TCP

Port:

8099

Used for:

Alternative HTTP port for applications

Why It’s Open

Port 8099 is commonly used as an alternative HTTP port for web applications, JBoss application servers, Apache Cassandra JMX monitoring, and various enterprise management interfaces. It’s frequently used in Java enterprise environments and is a popular choice for application server management consoles.

Common Risks

  • JBoss management console exposure
    Administrative interfaces may lack proper authentication
  • JMX security vulnerabilities
    Java Management Extensions may allow remote code execution
  • Default credentials
    Application servers often ship with weak default passwords
  • Web application exploits
    Deployed applications may contain security vulnerabilities
  • Information disclosure
    Server status pages may reveal system configuration
  • Cassandra monitoring exposure
    Database monitoring interfaces may leak sensitive data
  • Session hijacking
    Insecure session management in enterprise applications

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Enumeration & Testing

Service Detection:

Terminal window
nmap -sV -p 8099

JBoss Application Server Testing:

Terminal window
curl http://:8099/jmx-console/ curl http://:8099/admin-console/

JMX Interface Discovery:

Terminal window
nmap --script jmx-discovery -p8099  curl http://:8099/metrics

What to Look For

CheckpointWhat it means
Service versionIdentify software version and patch level
AuthenticationCheck for default or weak credentials
SSL/TLS configVerify encryption settings if applicable
Access controlsTest for proper authorization mechanisms

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 8099 = JBoss/Cassandra JMX with enterprise application vulnerabilities
  • Protocol: TCP
  • Used for: JBoss management and Cassandra JMX monitoring
  • Security focus: Enterprise application security and JMX hardening

Known CVEs and Exploits