Port 2000 / 4786 – Cisco SCCP / Smart Install

Why It’s Open

Cisco phones and switches use these ports for voice control and automation.

Common Risks

• Config Extraction: Unauthenticated download of config.
• Device Reboot or Wipe
• Lateral Movement in Network

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Enumeration & Testing

Port and Version Check:

nmap -p 2000,4786 -sV

Smart Install Toolkit (Cisco or open source):

• Tool: SmartInstallExploit.py Open-source tool to abuse Smart Install for config download/upload or device reload:

python SmartInstallExploit.py -target  -action download

• Metasploit Modules:

auxiliary/scanner/misc/cisco_smart_install
auxiliary/admin/cisco/cisco_smart_install

SCCP Enumeration

• SCCP (port 2000) is used for Cisco IP phones:
  • Use Wireshark filters: tcp.port == 2000
  • Look for registration messages or raw SCCP payloads (can reveal device info)
  • Cisco IP phones may expose device type, MAC, firmware version

Packet Crafting / Replay

• Use tools like scapy or sippts to craft raw TCP payloads to simulate phone registrations or Smart Install messages.

Known Exploits

1. CVE-2018-0171 A vulnerability in the Smart Install feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to execute arbitrary code on an affected device.

🔗 NVD Entry

🔗 Cisco Advisory

Exploited in the wild (used in Russian state-sponsored attacks per US-CERT).

2. CVE-2018-0156 A vulnerability in the Smart Install feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to obtain configuration files from affected devices.

🔗 NVD Entry

🔗 Cisco Advisory

3. CVE-2018-0172 Privilege escalation via Smart Install misuse

SCCP (Port 2000)

• No specific public CVEs, but:
  • Devices on this port often expose unauthenticated metadata during IP phone provisioning.
  • SCCP can be abused in man-in-the-middle attacks or to spoof registration.

What to Look For

Mitigation

• Disable Smart Install.
• Restrict SCCP to internal VLANs.
• Monitor device activity logs.

TL;DR

• Service: SCCP (Cisco VoIP) / Smart Install (Switch Config Management)
• Default Ports: 2000/TCP, 4786/TCP
• Risks: Unauthorized config access, switch takeover, remote code execution
• Mitigation: Disable Smart Install if not used, restrict to trusted networks, monitor for abnormal traffic