Executive Summary

This vulnerability is an unsafe DLL loading issue in MailEnable versions prior to 10.54. The MailEnable administrative executable loads a DLL named MEAIMF.DLL from its installation directory without properly verifying its integrity or using a secure search order. A local attacker who has write access to that directory can place a malicious MEAIMF.DLL file there. When the executable starts, it loads this malicious DLL, allowing the attacker to execute arbitrary code with the privileges of the process.

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Impact Analysis

This vulnerability can allow a local attacker with write access to the MailEnable installation directory to execute arbitrary code with the privileges of the MailEnable administrative process. This could lead to unauthorized actions on the system, potentially compromising the server or gaining elevated privileges.

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Detection Guidance

Detection involves checking the MailEnable installation directory for the presence of a suspicious or unauthorized MEAIMF.DLL file that could be maliciously planted. Since the vulnerability requires local write access to the directory, verifying file integrity and permissions on MEAIMF.DLL is critical. Commands to list and verify the DLL include: 1) On Windows, use 'dir /a /b "<MailEnable_install_dir>\MEAIMF.DLL"' to check if the DLL exists. 2) Use 'icacls "<MailEnable_install_dir>\MEAIMF.DLL"' to review permissions. 3) Use 'sigcheck' or 'Get-AuthenticodeSignature' PowerShell cmdlet to verify the digital signature of MEAIMF.DLL. 4) Monitor process loads or use tools like Process Monitor to detect if MEAIMF.DLL is loaded unexpectedly. These steps help identify if the DLL has been tampered with or replaced by an attacker.

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Mitigation Strategies

Immediate mitigation steps include: 1) Restrict write permissions to the MailEnable installation directory to prevent unauthorized users from placing or modifying MEAIMF.DLL. 2) Upgrade MailEnable to version 10.54 or later, where this unsafe DLL loading vulnerability is fixed. 3) Monitor and audit the directory for unexpected changes to MEAIMF.DLL. 4) Consider running the MailEnable administrative executable with the least privileges necessary to limit impact if exploited.

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