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Port 1025 – Microsoft RPC (Microsoft Remote Procedure Call)

Service:

rpc

Protocol:

TCP

Port:

1025

Used for:

Remote Procedure Call for Windows services

Why It’s Open

Port 1025 is one of the dynamic ports used by Microsoft Remote Procedure Call (RPC) services. It’s commonly associated with the RPC endpoint mapper and various Windows services that need to communicate across the network. This port is part of the dynamic RPC port range that Windows systems use for distributed computing and service-to-service communication.

Organizations running Windows infrastructure often see this port in use for internal communications between domain controllers, Exchange servers, and other Windows services. It’s particularly active in Active Directory environments where numerous RPC-based services need to communicate.

Common Risks

  • RPC Vulnerabilities:
    Complex protocol implementation leads to security flaws.
  • Authentication Bypass:
    Misconfigurations can allow unauthorized access.
  • Service Exploitation:
    Exposed RPC endpoints may be targeted.
  • Information Disclosure:
    Service enumeration reveals system details.
  • Lateral Movement:
    Compromised RPC services enable network traversal.

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Enumeration & Testing

Check if it’s open:

Terminal window
nmap -sT -p 1025

Test RPC connection:

Terminal window
rpcdump.py

Enumerate endpoints:

Terminal window
rpcinfo -p

What to Look For

CheckpointWhat it means
Open RPC endpointsServices potentially exploitable
Authentication not requiredUnauthorized access possible
Version informationMay reveal vulnerable implementations
Excessive permissionsService running with high privileges

Mitigation

  • Restrict Access:
    Limit RPC communications to necessary systems.
  • Firewall Rules:
    Block external access to RPC ports.
  • Strong Authentication:
    Implement Kerberos or certificate-based authentication.
  • Service Hardening:
    Run services with minimal required privileges.
  • Regular Updates:
    Keep Windows systems and services patched.

TL;DR

  • Port 1025 = Microsoft RPC
  • Critical for Windows services
  • Often part of attack surface
  • Needs strict access controls

Known CVEs and Exploits

  • CVE-2022-26809 – Critical RPC vulnerability in Windows (remote code execution)
  • CVE-2017-8461– Windows RPC remote code execution vulnerability
  • **Impacket **rpcdump.py – RPC endpoint enumeration tool