CVE-2009-4952 in Dir Listing
Summary
by MITRE
Directory traversal vulnerability in the Directory Listing (dir_listing) extension 1.1.0 and earlier for TYPO3 allows remote attackers to have an unspecified impact via unknown vectors.
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Analysis
by VulDB Data Team • 01/02/2018
The CVE-2009-4952 vulnerability represents a directory traversal flaw within the Directory Listing extension for TYPO3 content management system. This particular vulnerability affects versions 1.1.0 and earlier of the dir_listing extension, which is a core component used for generating directory listings within TYPO3 websites. The vulnerability stems from inadequate input validation and sanitization within the extension's handling of file paths and directory references. Attackers can exploit this weakness to manipulate the extension's behavior and potentially access restricted files or directories on the web server. The unspecified impact mentioned in the description indicates that the vulnerability could enable various malicious activities including information disclosure, unauthorized file access, or potentially more severe consequences depending on the server configuration and the attacker's objectives.
The technical implementation of this directory traversal vulnerability occurs when the dir_listing extension processes user-supplied input without proper validation of path traversal sequences such as ../ or ..\ that could allow attackers to navigate outside the intended directory structure. This weakness typically arises from insufficient filtering of special characters or path components in the extension's file handling routines. The vulnerability exists at the application layer and can be exploited remotely without requiring authentication, making it particularly dangerous as it can be leveraged by attackers from anywhere on the internet. The extension's failure to properly sanitize input parameters means that malicious actors can craft requests that bypass normal directory access controls and potentially gain access to sensitive system files, configuration data, or other restricted resources that should remain protected from public access.
The operational impact of CVE-2009-4952 extends beyond simple information disclosure, as it can enable attackers to potentially execute arbitrary code or escalate privileges within the affected TYPO3 environment. When exploited successfully, this vulnerability can lead to complete system compromise, especially if the web server has elevated permissions or if the extension is used to access sensitive files containing database credentials, application configuration details, or other critical system information. The vulnerability also poses risks to data integrity and availability, as attackers could potentially delete or modify critical files within the directory structure. Organizations running affected TYPO3 installations may experience reputational damage, regulatory compliance issues, and potential financial losses due to unauthorized access to sensitive information. The attack surface is particularly concerning given that TYPO3 was widely used for enterprise websites and content management systems, making numerous organizations potentially vulnerable to this type of exploitation.
Mitigation strategies for CVE-2009-4952 primarily involve immediate patching of the affected TYPO3 Directory Listing extension to version 1.1.1 or later, which contains the necessary fixes for the directory traversal vulnerability. System administrators should also implement proper input validation at multiple layers including web application firewalls, server-level filters, and application-level sanitization routines to prevent malicious path traversal attempts. Network segmentation and privilege separation can help limit the potential impact of successful exploitation attempts by ensuring that even if an attacker gains access to the web server, they cannot easily move laterally within the network. Regular security audits and vulnerability assessments should be conducted to identify and remediate similar weaknesses in other extensions or components of the TYPO3 installation. Organizations should also consider implementing monitoring solutions to detect unusual file access patterns or directory traversal attempts that could indicate exploitation attempts. The vulnerability aligns with CWE-22, which specifically addresses improper limitation of a pathname to a restricted directory, and represents a classic example of how insufficient input validation can lead to severe security consequences in web applications.
This vulnerability demonstrates the critical importance of proper input validation and sanitization in web application security, particularly in content management systems where extensions and plugins can introduce additional attack vectors. The exploitation of such vulnerabilities highlights the need for comprehensive security practices including regular updates, security monitoring, and proper access controls. Organizations should maintain current knowledge of security advisories for their CMS platforms and implement automated patch management solutions to ensure timely remediation of known vulnerabilities. The incident also underscores the necessity of following secure coding practices and conducting thorough security testing of third-party extensions before deployment in production environments. Given the age of this vulnerability, it serves as a reminder of the importance of maintaining up-to-date security measures and the potential long-term risks associated with running outdated software components in enterprise environments.