CVE-2014-9414 in Total Cache
Summary
by MITRE
The W3 Total Cache plugin before 0.9.4.1 for WordPress does not properly handle empty nonces, which allows remote attackers to conduct cross-site request forgery (CSRF) attacks and hijack the authentication of administrators for requests that change the mobile site redirect URI via the mobile_groups[*][redirect] parameter and an empty _wpnonce parameter in the w3tc_mobile page to wp-admin/admin.php.
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Analysis
by VulDB Data Team • 04/10/2022
The W3 Total Cache plugin vulnerability CVE-2014-9414 represents a critical cross-site request forgery weakness that specifically targets WordPress environments utilizing this popular caching solution. This vulnerability exists in versions prior to 0.9.4.1 and demonstrates a fundamental failure in nonce validation mechanisms that are essential for maintaining authentication integrity. The flaw allows remote attackers to exploit the plugin's insufficient handling of empty nonce values, creating a pathway for unauthorized administrative actions that could fundamentally compromise site security and user trust.
The technical exploitation of this vulnerability occurs through a carefully crafted request that manipulates the mobile_groups[*][redirect] parameter within the w3tc_mobile page context. When an attacker submits a request containing an empty _wpnonce parameter to the wp-admin/admin.php endpoint, the plugin fails to properly validate this critical authentication token. This failure stems from the plugin's inadequate implementation of nonce verification logic, which should have rejected requests lacking proper authentication tokens. The vulnerability specifically affects the mobile site redirect URI configuration, allowing attackers to potentially redirect users to malicious sites or execute unauthorized administrative commands.
The operational impact of this CSRF vulnerability extends beyond simple redirection attacks, as it provides attackers with the capability to hijack administrator sessions and perform privileged actions within the WordPress administration interface. An attacker could leverage this weakness to modify mobile site configurations, potentially redirecting users to phishing sites or malicious content while maintaining the appearance of legitimate administrative activity. This creates a significant risk for website owners who rely on W3 Total Cache for performance optimization, as the vulnerability essentially allows unauthorized modification of critical site configuration parameters that control mobile user experiences.
Security practitioners should recognize this vulnerability as a clear example of improper input validation and authentication token handling, aligning with CWE-352 which specifically addresses cross-site request forgery weaknesses. The attack vector demonstrates characteristics consistent with ATT&CK technique T1566.001 for credential harvesting through phishing, as the compromised administrator session could be used to access sensitive data and perform further malicious activities. Organizations affected by this vulnerability should immediately update to W3 Total Cache version 0.9.4.1 or later, as this release includes proper nonce validation that prevents empty nonce parameters from being accepted for administrative operations.
The remediation strategy involves not only updating the plugin to the patched version but also implementing comprehensive monitoring for unauthorized configuration changes. Security teams should establish automated checks for mobile redirect URI modifications and maintain detailed audit logs of administrative activities. Additionally, implementing additional CSRF protection measures such as custom nonce generation and validation, along with regular security scanning of WordPress installations, can help prevent similar vulnerabilities from being exploited in other plugins or themes. The vulnerability serves as a reminder of the critical importance of proper authentication token handling in web applications and the potential consequences when these security mechanisms are inadequately implemented.