CVE-2026-34352 TigerVNC权限错误漏洞

#!/usr/bin/env python3 """ PoC for CVE-2026-34352 (TigerVNC Permission Issue) This script demonstrates checking for accessible VNC sockets or memory segments that might be exposed due to incorrect permissions in x0vncserver. Note: This is a conceptual demonstration based on the vulnerability description. """ import os import glob def check_vnc_permissions(): print("[*] Checking for common x0vncserver resources...") # Check for X11 sockets (often used by x0vncserver) x11_socket_dir = "/tmp/.X11-unix" if os.path.exists(x11_socket_dir): print(f"[+] Found X11 socket directory: {x11_socket_dir}") for socket in glob.glob(os.path.join(x11_socket_dir, "X*")): mode = oct(os.stat(socket).st_mode)[-3:] print(f" - Socket: {os.path.basename(socket)} Permissions: {mode}") # If world-readable/writable, it might be vulnerable depending on config if mode.endswith('6') or mode.endswith('7'): print(f" [!] Potential weak permissions detected on {socket}") # Check for potential TigerVNC shared memory segments (Linux) # /dev/shm is often used for IPC shm_dir = "/dev/shm" if os.path.exists(shm_dir): print(f"[*] Checking shared memory in {shm_dir}...") for item in os.listdir(shm_dir): if "vnc" in item.lower() or "x11" in item.lower(): path = os.path.join(shm_dir, item) try: if os.path.isfile(path): mode = oct(os.stat(path).st_mode)[-3:] print(f" - File: {item} Permissions: {mode}") if mode.endswith('6') or mode.endswith('7'): print(f" [!] Weak permissions on potential VNC resource: {item}") except PermissionError: pass print("[!] If weak permissions are found, a local attacker could read screen data or inject input.") if __name__ == "__main__": check_vnc_permissions()