CVE-2013-2011 in W3 Super Cache Plugin
Summary
by MITRE
WordPress W3 Super Cache Plugin before 1.3.2 contains a PHP code-execution vulnerability which could allow remote attackers to inject arbitrary code. This issue exists because of an incomplete fix for CVE-2013-2009.
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Analysis
by VulDB Data Team • 03/17/2024
The WordPress W3 Super Cache plugin version 1.3.2 and earlier contained a critical PHP code execution vulnerability that exposed WordPress installations to remote code execution attacks. This vulnerability represented a significant security risk as it allowed attackers to execute arbitrary PHP code on affected systems without requiring authentication. The flaw emerged from an incomplete remediation of a previous vulnerability identified as CVE-2013-2009, demonstrating how inadequate security fixes can leave systems vulnerable to exploitation. The vulnerability specifically targeted the plugin's handling of user input within cache management functions, creating a pathway for malicious actors to inject and execute unauthorized code.
Technical exploitation of this vulnerability occurred through improper input validation and sanitization within the plugin's caching mechanisms. Attackers could manipulate specific parameters in HTTP requests to inject malicious PHP code into the caching system, which would then be executed when the cached content was served to users. The vulnerability was particularly dangerous because it leveraged the plugin's legitimate caching functionality to deliver malicious payloads, making detection more challenging. The incomplete fix for CVE-2013-2009 failed to address all potential injection vectors, leaving residual attack surfaces that could be exploited by threat actors. This represents a classic case of insufficient input validation that aligns with CWE-20, which describes improper input validation as a fundamental weakness in software security.
The operational impact of this vulnerability extended beyond simple code execution, as it provided attackers with persistent access to compromised WordPress installations. Once exploited, attackers could modify website content, steal sensitive data, install backdoors, or use the compromised system as a launching point for further attacks within the network. The vulnerability affected all WordPress installations using the affected plugin version, making it a widespread concern for website administrators and security professionals. The risk was particularly elevated because the vulnerability could be exploited remotely without any authentication requirements, making it accessible to anyone with knowledge of the affected system. Organizations running WordPress sites with this plugin version faced potential data breaches, website defacement, and service disruption.
Mitigation strategies for this vulnerability required immediate plugin updates to version 1.3.2 or later, which contained the proper fix for the code execution flaw. System administrators should have implemented comprehensive monitoring of their WordPress installations to detect any suspicious activity or unauthorized modifications. Security best practices recommended disabling the affected plugin immediately while applying updates and conducting thorough security audits. The vulnerability highlighted the importance of proper security patch management and the need for comprehensive testing of security fixes to ensure complete remediation. Organizations should have reviewed their incident response procedures to prepare for potential exploitation events. This vulnerability also underscored the necessity of maintaining up-to-date security controls and implementing proper input validation practices to prevent similar issues in the future. The incident served as a reminder of the critical importance of thorough vulnerability assessment and the dangers of incomplete security fixes in maintaining robust cybersecurity postures.