CVE-2024-12365 in W3 Total Cache
Summary
by MITRE • 01/14/2025
The W3 Total Cache plugin for WordPress is vulnerable to unauthorized access of data due to a missing capability check on the is_w3tc_admin_page function in all versions up to, and including, 2.8.1. This makes it possible for authenticated attackers, with Subscriber-level access and above, to obtain the plugin's nonce value and perform unauthorized actions, resulting in information disclosure, service plan limits consumption as well as making web requests to arbitrary locations originating from the web application that can be used to query information from internal services, including instance metadata on cloud-based applications.
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Analysis
by VulDB Data Team • 01/17/2025
The vulnerability identified as CVE-2024-12365 affects the W3 Total Cache plugin for WordPress, a widely used caching solution that significantly impacts website performance and security. This critical flaw stems from insufficient access control mechanisms within the plugin's administrative interface, specifically targeting the is_w3tc_admin_page function that fails to properly validate user capabilities before granting access to sensitive administrative functions. The vulnerability exists in all versions up to and including 2.8.1, making it a persistent threat across a substantial user base that relies on this popular caching plugin for their WordPress installations.
The technical implementation of this vulnerability resides in the absence of proper capability checks within the plugin's administrative routing system. When an authenticated user accesses certain plugin administrative pages, the is_w3tc_admin_page function does not verify whether the requesting user possesses the appropriate permissions to access those specific administrative functions. This missing validation creates a privilege escalation path where users with Subscriber-level access or higher can bypass normal access controls and gain access to administrative features that should be restricted to administrators or users with elevated privileges. The flaw directly maps to CWE-284, which describes improper access control vulnerabilities where insufficient checks allow unauthorized users to access protected resources or perform privileged operations.
The operational impact of this vulnerability extends beyond simple information disclosure, creating a comprehensive attack surface that can be exploited by malicious actors within the WordPress ecosystem. An attacker with Subscriber-level access can extract the plugin's nonce value, which serves as a security token for validating administrative actions. This nonce extraction enables the attacker to perform unauthorized administrative operations, including modifying plugin settings, accessing sensitive configuration data, and potentially executing arbitrary code within the WordPress environment. The vulnerability also allows for service plan limit consumption, which can lead to unexpected costs for the website owner, and enables web requests to arbitrary locations from the web application. This latter capability poses significant risks for cloud-based applications where internal services might be accessible through instance metadata endpoints, potentially allowing attackers to gather sensitive information about the underlying infrastructure.
The attack vector for this vulnerability demonstrates the dangerous combination of privilege escalation and information gathering capabilities that make it particularly concerning for WordPress administrators. Once an attacker obtains the nonce value, they can perform administrative actions that might appear to originate from legitimate system operations, making detection more difficult. The ability to make web requests to arbitrary locations from the web application creates opportunities for attackers to probe internal networks, access cloud instance metadata, and potentially discover additional vulnerabilities within the hosting environment. This capability aligns with ATT&CK technique T1046, which describes the use of network service scanning to gather information about the target environment, and T1082, which involves system information discovery that can reveal critical infrastructure details.
Mitigation strategies for CVE-2024-12365 should prioritize immediate plugin updates to versions that address the missing capability checks in the is_w3tc_admin_page function. WordPress administrators should also implement additional security measures including role-based access control restrictions, regular monitoring of administrative actions, and network-level firewalls that can restrict access to administrative interfaces. The implementation of web application firewalls and intrusion detection systems can help identify and block suspicious administrative requests that might exploit this vulnerability. Additionally, administrators should conduct thorough security audits of their WordPress installations to ensure no unauthorized changes have been made and consider implementing multi-factor authentication for administrative accounts. The vulnerability highlights the critical importance of proper access control implementation in web applications and serves as a reminder of the potential consequences when privilege validation mechanisms are insufficiently implemented in popular plugins that serve as foundational components of WordPress security infrastructure.