CVE-2014-4585 in WP-FaceThumb
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in the WP-FaceThumb plugin possibly 1.0 and earlier for WordPress allows remote attackers to inject arbitrary web script or HTML via the ajax_url parameter to index.php.
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Analysis
by VulDB Data Team • 03/10/2019
The CVE-2014-4585 vulnerability represents a critical cross-site scripting flaw within the WP-FaceThumb WordPress plugin version 1.0 and earlier. This vulnerability resides in the plugin's handling of user-supplied input through the ajax_url parameter in the index.php file, creating a significant security risk for WordPress installations. The flaw demonstrates how third-party plugins can introduce exploitable vectors into otherwise secure content management systems, highlighting the importance of thorough security auditing for all plugin components.
This XSS vulnerability operates by allowing remote attackers to inject malicious web scripts or HTML content through the ajax_url parameter, which is processed without adequate input sanitization or output encoding. When the vulnerable plugin processes this parameter, it fails to properly validate or escape the input before rendering it in the web page context. The attack vector specifically targets the index.php file, suggesting that the vulnerability exists in the plugin's core processing logic where AJAX requests are handled. This type of flaw falls under CWE-79, which specifically addresses cross-site scripting vulnerabilities, and represents a classic example of how improper input validation can lead to severe security consequences.
The operational impact of this vulnerability extends beyond simple script injection, as it enables attackers to execute malicious code within the context of authenticated users' browsers. This could lead to session hijacking, credential theft, data exfiltration, or the redirection of users to malicious websites. Attackers could potentially exploit this vulnerability to gain unauthorized access to user accounts, modify content, or perform actions on behalf of legitimate users. The vulnerability affects WordPress installations that use the WP-FaceThumb plugin, creating a persistent threat vector that remains active until the plugin is updated or removed from affected systems. According to ATT&CK framework, this vulnerability maps to T1566.001, which covers the initial access through web application attacks, and T1059.001, representing command and scripting interpreter for executing malicious scripts.
Mitigation strategies for CVE-2014-4585 require immediate action from affected WordPress administrators. The primary and most effective solution involves upgrading to a patched version of the WP-FaceThumb plugin, as the vulnerability was addressed in subsequent releases. System administrators should also implement input validation measures at the web application firewall level, ensuring that all parameters including ajax_url are properly sanitized before processing. Additionally, the principle of least privilege should be enforced by limiting plugin permissions and implementing Content Security Policy headers to prevent execution of unauthorized scripts. Regular security audits of installed plugins, along with maintaining updated WordPress core and plugin versions, forms the foundation of defense against such vulnerabilities. Organizations should also consider implementing automated vulnerability scanning tools to identify similar issues in other installed components and maintain comprehensive backup strategies to enable quick recovery from potential exploitation attempts.