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Port 50000 – DB2 (IBM DB2)

Service:

db2

Protocol:

TCP

Port:

50000

Used for:

IBM DB2 database server

Why It’s Open

Port 50000 is the default port for IBM DB2 database server instances. DB2 is an enterprise-grade relational database management system widely used in corporate environments for mission-critical applications. This port handles client connections, administrative commands, and data queries.

Common Risks

  • Database enumeration
    Unauthorized access to database structure and metadata
  • SQL injection attacks
    Malicious queries can compromise database integrity
  • Credential attacks
    Brute force against DB2 user accounts
  • Data exfiltration
    Unauthorized access to sensitive business data
  • Privilege escalation
    DB2 admin privileges can lead to OS-level access
  • Denial of service
    Resource exhaustion through expensive queries
  • Configuration exposure
    Database settings may reveal system information

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Enumeration & Testing

Service Detection:

Terminal window
nmap -sV -p 50000

DB2 Connection Test:

Terminal window
db2 connect to SAMPLE user db2admin using password
Terminal window
nc  50000

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 50000 = IBM DB2 service
  • Protocol: TCP
  • Used for: IBM DB2 database server
  • Security focus: Proper configuration and monitoring required

Known CVEs and Exploits