CVE-2006-0817 in Mail Server
Summary
by MITRE
Absolute path directory traversal vulnerability in (a) MERAK Mail Server for Windows 8.3.8r with before IceWarp Web Mail 5.6.1 and (b) VisNetic MailServer before 8.5.0.5 allows remote attackers to include arbitrary files via a full Windows path and drive letter in the (1) language parameter in accounts/inc/include.php and (2) lang_settings parameter in admin/inc/include.php, which is not properly sanitized by the securepath function, a related issue to CVE-2005-4556.
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Analysis
by VulDB Data Team • 01/20/2025
The CVE-2006-0817 vulnerability represents a critical directory traversal flaw affecting multiple email server platforms including MERAK Mail Server for Windows and VisNetic MailServer. This vulnerability stems from improper input validation in the securepath function which fails to adequately sanitize user-supplied parameters containing absolute Windows paths with drive letters. The flaw specifically impacts two key include files within these mail server implementations where attacker-controlled input can be passed directly to file inclusion mechanisms without proper path validation or sanitization. The vulnerability operates by allowing remote attackers to manipulate the language parameter in accounts/inc/include.php and the lang_settings parameter in admin/inc/include.php, both of which are processed through the insecure securepath function that does not properly restrict file access to predetermined directories.
This directory traversal vulnerability enables attackers to include arbitrary files from the local filesystem by supplying absolute Windows paths that begin with drive letters such as c:, d:, or other valid drive designations. The securepath function, which should act as a security barrier to prevent unauthorized file access, fails to properly validate or sanitize input containing full paths, allowing malicious users to bypass normal file access controls and potentially include system files, configuration files, or other sensitive data. The vulnerability is particularly concerning because it affects administrative interfaces where privileged operations are performed, potentially allowing attackers to escalate privileges or gain unauthorized access to sensitive system information. This issue is classified as a directory traversal vulnerability under CWE-22 and represents a specific implementation of the broader category of path traversal attacks that have been documented in security literature for many years.
The operational impact of this vulnerability extends beyond simple file inclusion attacks to potentially enable complete system compromise when combined with other exploitation techniques. Attackers can leverage this vulnerability to access sensitive configuration files, database credentials, system logs, or other administrative resources that would normally be protected from direct access. The vulnerability affects both the web-based administration interfaces and user-facing components of the mail servers, creating multiple attack vectors for potential exploitation. Organizations running affected versions of MERAK Mail Server for Windows 8.3.8r and VisNetic MailServer before 8.5.0.5 face significant risk of unauthorized access, data leakage, and potential system compromise. The vulnerability also relates to CVE-2005-4556, indicating that similar path traversal issues have been identified in related software components, suggesting that the underlying security architecture may be fundamentally flawed in how it handles file path validation.
Mitigation strategies for CVE-2006-0817 require immediate patching of affected systems with vendor-provided security updates that properly sanitize input parameters and implement robust path validation. Organizations should also implement network segmentation to limit access to administrative interfaces and consider implementing web application firewalls that can detect and block malicious path traversal attempts. The securepath function must be redesigned to properly validate all input parameters against a whitelist of acceptable paths or implement strict path normalization that prevents absolute path traversal. Security monitoring should be enhanced to detect suspicious file inclusion patterns in web server logs, and access controls should be tightened around administrative interfaces to reduce the attack surface. This vulnerability demonstrates the importance of proper input validation and the need for security-conscious development practices that prevent path traversal attacks through careful validation of all user-supplied input before it is processed by file inclusion functions. The ATT&CK framework categorizes this as a path traversal technique under the T1059.007 sub-technique for command and scripting interpreter, as exploitation may lead to further system compromise through the execution of arbitrary code.