CVE-2006-1114 in Loudblog
Summary
by MITRE
Multiple directory traversal vulnerabilities in Loudblog before 0.42 allow remote attackers to read or include arbitrary files via a .. (dot dot) and trailing %00 (NULL) byte in the (1) template and (2) page parameters in (a) index.php, and the (3) language parameter in (b) inc/backend_settings.php.
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Analysis
by VulDB Data Team • 06/16/2019
The vulnerability described in CVE-2006-1114 represents a critical directory traversal flaw affecting Loudblog versions prior to 0.42. This security weakness stems from inadequate input validation mechanisms within the application's file handling processes, specifically in how the software processes template, page, and language parameters. The vulnerability manifests when remote attackers exploit the application's failure to properly sanitize user-supplied input, allowing them to manipulate file paths through crafted requests containing directory traversal sequences.
The technical implementation of this vulnerability involves the exploitation of the .. (dot dot) traversal sequence combined with a trailing %00 (NULL) byte in multiple file parameters. When the application processes these malicious inputs, it fails to properly validate or sanitize the user-supplied data before using it in file system operations. This allows attackers to navigate beyond the intended directory boundaries and access files that should remain restricted. The vulnerability affects two primary entry points: the template and page parameters in index.php, and the language parameter in inc/backend_settings.php, creating multiple attack vectors for exploitation.
The operational impact of this directory traversal vulnerability is severe and multifaceted. Remote attackers can leverage this weakness to read arbitrary files from the server's file system, potentially accessing sensitive configuration files, database credentials, user data, or even system files. The inclusion of the NULL byte (%00) in the attack payload enhances the exploit's effectiveness by potentially bypassing certain input validation checks that might be in place. This vulnerability fundamentally undermines the application's security model, as it allows unauthorized access to the underlying file system and can lead to complete system compromise.
The vulnerability aligns with CWE-22, which specifically addresses directory traversal or path traversal issues in software applications. This classification indicates that the flaw represents a well-known and commonly exploited pattern in web application security where input validation fails to prevent access to files outside of the intended directory structure. From an ATT&CK framework perspective, this vulnerability maps to T1083 (File and Directory Discovery) and potentially T1566 (Phishing) if attackers use this weakness to gain access to sensitive information that can then be used for further attacks. The vulnerability also demonstrates characteristics of T1190 (Exploit Public-Facing Application) as it allows remote exploitation of a web application through publicly accessible parameters.
Mitigation strategies for this vulnerability should focus on implementing robust input validation and sanitization mechanisms throughout the application. The most effective approach involves proper parameter validation that rejects or filters out directory traversal sequences before they can be processed by the file system operations. Developers should implement a whitelist-based approach for file access, ensuring that only predetermined, safe file paths can be accessed. Additionally, the application should employ proper encoding and sanitization of user input, particularly when handling file system operations. System administrators should ensure that all Loudblog installations are updated to version 0.42 or later, where the vulnerability has been patched. Network-level protections such as web application firewalls can provide additional layers of defense, though the primary fix must be implemented at the application level through proper input validation and secure coding practices.