CVE-2005-1651 in PostMaster
Summary
by MITRE
Directory traversal vulnerability in message.htm for Woppoware PostMaster 4.2.2 (build 3.2.5) allows remote attackers to determine the existence of arbitrary files via a .. (dot dot) in the wmm parameter.
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Analysis
by VulDB Data Team • 06/02/2019
The vulnerability identified as CVE-2005-1651 represents a directory traversal flaw within the Woppoware PostMaster 4.2.2 email server software, specifically affecting the message.htm component. This security weakness arises from insufficient input validation mechanisms that fail to properly sanitize user-supplied parameters before processing them within the application's file access routines. The vulnerability manifests when the wmm parameter in the message.htm script accepts directory traversal sequences without adequate filtering, enabling malicious actors to manipulate file system access patterns through carefully crafted input sequences containing dot-dot-slash sequences.
The technical exploitation of this vulnerability occurs through the manipulation of the wmm parameter to include directory traversal sequences such as ..\ or ../ which allow attackers to navigate outside the intended directory boundaries where email messages are stored. This flaw directly maps to CWE-22, which categorizes improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal. The vulnerability exists because the application does not validate or sanitize the wmm parameter input, allowing attackers to construct malicious paths that can access arbitrary files on the server's file system. This type of vulnerability is particularly dangerous in web applications where file system access is involved, as it can potentially expose sensitive configuration files, user data, or system files that should remain inaccessible to unauthorized users.
The operational impact of this directory traversal vulnerability extends beyond simple file enumeration, as it provides attackers with the capability to potentially access critical system files, configuration data, and user information stored on the server. Attackers can leverage this vulnerability to determine the existence of arbitrary files on the target system, which can aid in further exploitation efforts such as information disclosure attacks or privilege escalation attempts. The vulnerability affects the confidentiality and integrity of the email server by allowing unauthorized access to potentially sensitive data that should be protected within the application's designated file access boundaries. This weakness particularly impacts organizations using legacy email server software where patching may not be immediately possible, creating extended attack windows for threat actors.
Mitigation strategies for this vulnerability should focus on implementing proper input validation and sanitization mechanisms within the application code. The most effective approach involves filtering and validating all user-supplied input parameters, particularly those used in file system operations, to prevent directory traversal sequences from being processed. Organizations should implement strict parameter validation that rejects or removes any sequences containing .. or similar traversal patterns before they can be used in file access operations. Additionally, the application should be configured to operate within restricted directory boundaries, ensuring that file system access is limited to only the necessary directories for email message handling. This vulnerability aligns with ATT&CK technique T1083, which covers file and directory discovery, and represents a classic example of how insufficient input validation can lead to privilege escalation and information disclosure scenarios. Regular security assessments and application code reviews should be conducted to identify and remediate similar path traversal vulnerabilities across all web applications and server software components.