CVE-2026-20835 Windows camsvc越界读取信息泄露漏洞

# CVE-2026-20835 PoC - Out-of-bounds Read in camsvc # This PoC demonstrates the vulnerability pattern (for educational purposes only) import ctypes from ctypes import wintypes import struct # Windows API definitions kernel32 = ctypes.windll.kernel32 ntdll = ctypes.windll.ntdll # Define necessary structures and constants class UNICODE_STRING(ctypes.Structure): _fields_ = [ ("Length", wintypes.USHORT), ("MaximumLength", wintypes.USHORT), ("Buffer", ctypes.c_wchar_p) ] # Open camsvc service handle scm_handle = kernel32.OpenSCManagerW(None, None, 0xF003F) if not scm_handle: print("[-] Failed to open Service Control Manager") exit(1) # Open camsvc service service_handle = kernel32.OpenServiceW(scm_handle, "camsvc", 0xF01FF) if not service_handle: print("[-] Failed to open camsvc service") kernel32.CloseServiceHandle(scm_handle) exit(1) print("[+] camsvc service handle obtained successfully") print("[+] Triggering potential out-of-bounds read condition...") # The actual exploitation requires specific malformed requests to camsvc # This PoC demonstrates the pattern - actual exploit needs further research # Cleanup kernel32.CloseServiceHandle(service_handle) kernel32.CloseServiceHandle(scm_handle) print("[+] Note: This is a proof-of-concept demonstrating the attack surface") print("[+] Actual exploitation requires deeper analysis of camsvc interface")