CVE-2016-20024

#!/usr/bin/env python3 """ CVE-2016-20024 PoC - ZKTeco ZKTime.Net Insecure File Permissions This script checks for world-writable permissions on ZKTime.Net installation directory. Note: This is for educational and authorized security testing purposes only. """ import os import stat import platform from pathlib import Path def check_file_permissions(filepath): """Check if file has world-writable permissions""" try: file_stat = os.stat(filepath) mode = file_stat.st_mode # Check world-write permission (0o002) world_write = mode & stat.S_IWOTH # Check world-read permission (0o004) world_read = mode & stat.S_IROTH # Check world-execute permission (0o001) world_exec = mode & stat.S_IXOTH return { 'path': filepath, 'world_read': bool(world_read), 'world_write': bool(world_write), 'world_exec': bool(world_exec), 'is_vulnerable': bool(world_write) } except Exception as e: return {'path': filepath, 'error': str(e)} def find_zktime_installation(): """Try to find ZKTime.Net installation directory""" possible_paths = [] if platform.system() == 'Windows': program_files = os.environ.get('ProgramFiles', 'C:\\Program Files') program_files_x86 = os.environ.get('ProgramFiles(x86)', 'C:\\Program Files (x86)') possible_paths = [ os.path.join(program_files, 'ZKTimeNet3.0'), os.path.join(program_files_x86, 'ZKTimeNet3.0'), 'C:\\Program Files\\ZKTimeNet3.0', 'C:\\Program Files (x86)\\ZKTimeNet3.0' ] found_paths = [] for path in possible_paths: if os.path.exists(path): found_paths.append(path) return found_paths def exploit_zktime_privilege_escalation(target_exe, malicious_exe): """ Simulate privilege escalation via file replacement WARNING: This is for authorized testing only """ print(f"[*] Target executable: {target_exe}") print(f"[*] Malicious executable: {malicious_exe}") if not os.path.exists(target_exe): print("[-] Target executable not found") return False if not os.path.exists(malicious_exe): print("[-] Malicious executable not found") return False # Check if target is world-writable result = check_file_permissions(target_exe) if result.get('is_vulnerable'): print("[!] VULNERABLE: Target file has world-write permission") print(f"[*] Exploitation possible - attacker can replace {target_exe}") return True else: print("[-] Target file is not vulnerable") return False def main(): print("=" * 60) print("CVE-2016-20024 PoC - ZKTeco ZKTime.Net") print("Insecure File Permissions Privilege Escalation") print("=" * 60) # Find installation print("\n[*] Searching for ZKTime.Net installation...") installations = find_zktime_installation() if not installations: print("[-] ZKTime.Net installation not found") print("[*] Manual check required") return for install_path in installations: print(f"\n[+] Found installation: {install_path}") # Check common executables common_exes = ['ZKTimeNet.exe', 'ZKTimeService.exe', 'TimeServer.exe'] for exe in common_exes: exe_path = os.path.join(install_path, exe) if os.path.exists(exe_path): result = check_file_permissions(exe_path) print(f"\n[*] Checking: {exe_path}") print(f" World-Read: {result['world_read']}") print(f" World-Write: {result['world_write']}") print(f" World-Execute: {result['world_exec']}") if result['is_vulnerable']: print(f" [!] VULNERABLE - Privilege escalation possible!") if __name__ == '__main__': main()

{"cve": {"id": "CVE-2016-20024", "sourceIdentifier": "[email protected]", "published": "2026-03-16T14:17:48.350", "lastModified": "2026-04-15T14:56:45.970", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "ZKTeco ZKTime.Net 3.0.1.6 contains an insecure file permissions vulnerability that allows unprivileged users to escalate privileges by modifying executable files. Attackers can exploit world-writable permissions on the ZKTimeNet3.0 directory and its contents to replace executable files with malicious binaries for privilege escalation."}, {"lang": "es", "value": "ZKTeco ZKTime.Net 3.0.1.6 contiene una vulnerabilidad de permisos de archivo inseguros que permite a usuarios sin privilegios realizar una escalada de privilegios mediante la modificación de archivos ejecutables. Los atacantes pueden explotar los permisos de escritura global (world-writable) en el directorio ZKTimeNet3.0 y su contenido para reemplazar archivos ejecutables con binarios maliciosos para la escalada de privilegios."}], "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:H/VI:H/VA:H/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": 9.3, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "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:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-538"}]}], "references": [{"url": "https://cxsecurity.com/issue/WLB-2016080264", "source": "[email protected]"}, {"url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/116487", "source": "[email protected]"}, {"url": "https://packetstormsecurity.com/files/138565", "source": "[email protected]"}, {"url": "https://www.exploit-db.com/exploits/40322/", "source": "[email protected]"}, {"url": "https://www.vulncheck.com/advisories/zkteco-zktime-net-insecure-file-permissions-privilege-escalation", "source": "[email protected]"}, {"url": "https://www.zeroscience.mk/en/vulnerabilities/ZSL-2016-5360.php", "source": "[email protected]"}]}}