CVE-2025-34418
📋 TL;DR
MailEnable versions before 10.54 have a DLL hijacking vulnerability where the administrative executable loads MEAIMF.DLL from its installation directory without proper security checks. Local attackers with write access to that directory can plant malicious DLLs that execute with the process's privileges when the executable starts. This affects MailEnable installations where local users have write permissions to the installation directory.
💻 Affected Systems
- MailEnable
📦 What is this software?
Mailenable by Mailenable
⚠️ Risk & Real-World Impact
Worst Case
Local privilege escalation to SYSTEM/administrator level if the vulnerable process runs with high privileges, leading to complete system compromise.
Likely Case
Local authenticated users gain code execution with the privileges of the MailEnable administrative process, potentially allowing lateral movement or persistence.
If Mitigated
Limited impact if proper file permissions restrict write access to installation directories and least privilege principles are followed.
🎯 Exploit Status
Exploitation requires local access and write permissions to the installation directory. DLL hijacking techniques are well-documented and easy to implement.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 10.54
Vendor Advisory: https://mailenable.com/Standard-ReleaseNotes.txt
Restart Required: Yes
Instructions:
1. Download MailEnable version 10.54 or later from the official website. 2. Run the installer to upgrade. 3. Restart MailEnable services and any affected systems.
🔧 Temporary Workarounds
Restrict directory permissions
windowsRemove write permissions for non-administrative users from the MailEnable installation directory
icacls "C:\Program Files\MailEnable" /deny Users:(OI)(CI)W
Enable SafeDllSearchMode
windowsConfigure Windows to search system directories before current directory for DLLs
reg add "HKLM\SYSTEM\CurrentControlSet\Control\Session Manager" /v SafeDllSearchMode /t REG_DWORD /d 1 /f
🧯 If You Can't Patch
- Apply strict file permissions to MailEnable installation directory, allowing only administrators write access.
- Monitor for unauthorized DLL files in the MailEnable directory and implement application whitelisting.
🔍 How to Verify
Check if Vulnerable:
Check MailEnable version in administrative interface or installation directory. Versions below 10.54 are vulnerable.Check Version:
Check the version.txt file in MailEnable installation directory or view version in MailEnable Management ConsoleVerify Fix Applied:
Verify version is 10.54 or higher in MailEnable administrative console or check file properties of MailEnable executables.📡 Detection & Monitoring
Log Indicators:
- Failed DLL loading attempts in Windows Event Logs (Event ID 1000)
- Unexpected DLL files in MailEnable installation directory
- Process creation events for MailEnable executables loading from unusual paths
Network Indicators:
- No direct network indicators as this is local exploitation
SIEM Query:
EventID=1000 AND ProcessName="*MailEnable*" AND (Message="*MEAI*" OR Message="*DLL*" OR Message="*faulting module*")