CVE-2004-2127 in Web Blog
Summary
by MITRE
Directory traversal vulnerability in Web Blog 1.1 allows remote attackers to read arbitrary files via a .. (dot dot) in the file variable.
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Analysis
by VulDB Data Team • 09/08/2024
The vulnerability identified as CVE-2004-2127 represents a classic directory traversal flaw affecting Web Blog 1.1 software. This security weakness stems from inadequate input validation mechanisms within the application's file handling processes, specifically when processing the file variable parameter. The vulnerability allows malicious actors to manipulate file paths through the use of directory traversal sequences such as .. which enables them to navigate beyond the intended directory boundaries and access files outside the web root or designated safe areas. Such flaws typically arise when applications fail to properly sanitize user-supplied input before using it in file system operations.
The technical exploitation of this vulnerability occurs when an attacker crafts a malicious request containing directory traversal sequences in the file parameter. The application processes this input without adequate validation, allowing the traversal sequences to be interpreted by the underlying file system. This enables attackers to access sensitive files such as configuration files, database files, system logs, or even system binaries that should remain inaccessible to remote users. The vulnerability operates at the application layer and requires no special privileges to exploit, making it particularly dangerous as it can be leveraged by anyone with network access to the affected system.
The operational impact of CVE-2004-2127 extends beyond simple unauthorized file access, potentially leading to complete system compromise. Attackers can use this vulnerability to retrieve sensitive information such as database credentials, application configuration details, or even execute arbitrary code if the application allows file inclusion from external sources. The vulnerability aligns with CWE-22, which specifically addresses improper limitation of a pathname to a restricted directory, and represents a fundamental flaw in input sanitization and access control mechanisms. From an attacker perspective, this vulnerability maps to multiple ATT&CK techniques including T1083 (File and Directory Discovery) and T1566 (Phishing with Malicious Attachments) as it enables reconnaissance and potential data exfiltration activities.
Mitigation strategies for this vulnerability require immediate implementation of proper input validation and sanitization measures. Organizations should ensure that all user-supplied parameters undergo rigorous validation before being used in file system operations. This includes implementing strict path validation that rejects or removes directory traversal sequences from input data. The solution should enforce a whitelist approach where only predetermined, safe file paths are allowed, rather than attempting to blacklist dangerous patterns. Additionally, applications should operate with minimal required privileges and implement proper access controls to limit the damage that can be caused even if traversal attempts are successful. Regular security audits and code reviews should be conducted to identify similar vulnerabilities in other applications and prevent future occurrences of this class of flaw.