CVE-2009-2432 in WordPress
Summary
by MITRE
WordPress and WordPress MU before 2.8.1 allow remote attackers to obtain sensitive information via a direct request to wp-settings.php, which reveals the installation path in an error message.
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Analysis
by VulDB Data Team • 02/01/2019
The vulnerability identified as CVE-2009-2432 represents a critical information disclosure flaw affecting WordPress and WordPress MU versions prior to 2.8.1. This vulnerability stems from improper error handling within the wp-settings.php file, which serves as a core configuration component in WordPress installations. When remote attackers send direct requests to this file, the system generates error messages that inadvertently expose the absolute installation path of the WordPress directory structure on the server. This type of information disclosure vulnerability falls under the CWE-200 category, which specifically addresses improper handling of sensitive information within software applications. The flaw demonstrates a classic security misconfiguration where system internals are exposed through error responses rather than being properly sanitized or suppressed.
The technical exploitation of this vulnerability occurs through simple HTTP requests directed at the wp-settings.php endpoint without proper authentication or authorization. When WordPress processes these requests and encounters errors during the configuration loading process, it outputs detailed error messages containing the full server path where the WordPress installation resides. This exposure creates a significant risk for attackers who can then use this information to plan more sophisticated attacks, such as directory traversal exploits or targeted attacks against specific WordPress versions. The vulnerability essentially provides an attacker with a roadmap to understand the server's file structure and potentially identify other weaknesses in the installation environment.
The operational impact of CVE-2009-2432 extends beyond simple information disclosure, as it enables attackers to perform reconnaissance activities that would otherwise be difficult or impossible without this knowledge. Once an attacker knows the exact installation path, they can better understand the server environment, potentially identify other vulnerable components, and craft more effective attack vectors. This vulnerability aligns with the ATT&CK technique T1083 (File and Directory Discovery) as it allows adversaries to enumerate system paths and directory structures. The exposure of installation paths can also facilitate attacks against other components in the WordPress ecosystem, as attackers may use this information to identify specific file locations where they can potentially inject malicious code or exploit other vulnerabilities.
The mitigation strategy for this vulnerability requires immediate patching of WordPress installations to version 2.8.1 or later, where the error handling has been properly addressed. System administrators should also implement proper input validation and error handling practices that prevent sensitive information from being exposed in error messages. Additional security measures include configuring web server error pages to suppress detailed system information, implementing proper access controls to prevent direct access to core WordPress files, and conducting regular security audits to identify similar misconfigurations. Organizations should also consider implementing web application firewalls that can detect and block suspicious requests to sensitive WordPress files, as well as monitoring for unusual access patterns that might indicate exploitation attempts. This vulnerability serves as a reminder of the importance of proper error handling and the potential consequences of exposing system internals through error messages.