CVE-2004-1496 in Web Forums Server
Summary
by MITRE
Directory traversal vulnerability in Web Forums Server 1.6 and 2.0 Power Pack allows remote attackers to read arbitrary files via a URL containing (1) "..\" (dot dot backslash), (2) "../" (dot dot slash), (3) "/%2E%2E%5C" (encoded dot dot backslash), or (4) "%2E%2E%2F" (encoded dot dot slash).
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Analysis
by VulDB Data Team • 06/08/2019
This directory traversal vulnerability exists within the Web Forums Server 1.6 and 2.0 Power Pack software, representing a critical security flaw that enables remote attackers to access arbitrary files on the affected system. The vulnerability stems from insufficient input validation and improper handling of path traversal sequences in the application's file access mechanisms. Attackers can exploit this weakness by crafting malicious URLs that contain specific traversal patterns, allowing them to navigate beyond the intended directory structure and access sensitive files that should remain protected. The vulnerability specifically targets four distinct traversal sequences including the classic "..\" backslash variant, the "../" forward slash variant, and their respective URL-encoded counterparts "%2E%2E%5C" and "%2E%2E%2F" which represent the same traversal patterns encoded for web transmission.
The technical implementation of this vulnerability falls under CWE-22, which classifies it as a directory traversal or path traversal attack. This weakness occurs when applications fail to properly validate user-supplied input before using it in file operations, allowing attackers to manipulate file paths and access unauthorized resources. The vulnerability operates at the application layer, specifically within the file handling components of the web forum server, where the system processes user requests for files without adequate sanitization of the requested paths. When the server processes these malicious requests, it fails to normalize or validate the path components, enabling the traversal sequences to be interpreted as legitimate navigation commands rather than malicious input. This allows attackers to access files such as configuration files, database files, system logs, and potentially sensitive data that should be restricted from public access.
From an operational perspective, this vulnerability poses significant risks to organizations running affected versions of the Web Forums Server. Remote attackers can exploit this flaw to gain unauthorized access to sensitive information, potentially leading to data breaches, system compromise, or further attacks. The impact extends beyond simple information disclosure as attackers may be able to access system configuration files that contain database credentials, administrative passwords, or other sensitive data that could facilitate additional attacks. The vulnerability's remote nature means that attackers do not require physical access or local system privileges to exploit it, making it particularly dangerous in internet-facing environments. The attack can be executed through standard web browser requests without requiring specialized tools or techniques, making it accessible to a wide range of threat actors from casual script kiddies to sophisticated attackers. This vulnerability directly aligns with several ATT&CK techniques including T1083 (File and Directory Discovery) and T1566 (Phishing) as attackers may use this weakness to discover and extract sensitive files from compromised systems.
The mitigation strategies for this vulnerability should focus on implementing proper input validation and sanitization mechanisms within the application. Organizations should ensure that all user-supplied input containing file path information is properly validated and normalized before being processed by the file system. This includes implementing strict path validation that rejects or removes traversal sequences such as "..\", "../", "%2E%2E%5C", and "%2E%2E%2F" from all file access requests. The recommended approach involves implementing a whitelist-based validation system that only allows specific, legitimate file paths rather than attempting to blacklist dangerous patterns. Additionally, organizations should implement proper access controls and file permissions to ensure that even if an attacker bypasses input validation, they cannot access sensitive files due to insufficient system permissions. System administrators should also consider implementing web application firewalls or security filters that can detect and block these specific traversal patterns at the network level. The most effective long-term solution involves upgrading to patched versions of the Web Forums Server software, as the vulnerability represents a fundamental flaw in the application's input handling that requires code-level fixes to resolve completely. Regular security assessments and input validation testing should be implemented to prevent similar vulnerabilities from being introduced in future software versions or custom modifications.