CVE-2012-6078 in Total Cache
Summary
by MITRE
W3 Total Cache before 0.9.2.5 generates hash keys insecurely which allows remote attackers to predict the values of the hashes.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 11/23/2019
The W3 Total Cache plugin for WordPress before version 0.9.2.5 contains a critical cryptographic vulnerability that compromises the security of cached content and user sessions. This vulnerability stems from an insecure implementation of hash key generation mechanisms within the plugin's caching infrastructure. The flaw allows remote attackers to predict hash values through pattern analysis and statistical methods, potentially enabling them to manipulate cached data or bypass security controls. The vulnerability affects the core functionality of the caching system where hash keys are used to identify and retrieve cached content, making it a significant concern for WordPress installations relying on this plugin for performance optimization.
The technical implementation of hash key generation in the affected W3 Total Cache versions utilizes predictable algorithms that do not incorporate sufficient entropy or cryptographic randomness. This insecure approach means that attackers can reverse-engineer the hash generation process by analyzing a small sample of generated hash values. The vulnerability specifically impacts the plugin's ability to create unique identifiers for cached objects, user sessions, and other security-sensitive data elements. According to CWE-330, this represents a weakness in entropy where insufficient randomness is used in cryptographic operations, making the system vulnerable to prediction attacks. The flaw essentially creates a backdoor through which malicious actors can access or manipulate cached content without proper authentication, undermining the fundamental security model of the caching system.
The operational impact of this vulnerability extends beyond simple cache manipulation to potentially enable more severe attacks including session hijacking, content injection, and cache poisoning. Attackers who can predict hash values can exploit the caching system to serve malicious content to legitimate users or gain unauthorized access to protected resources. This vulnerability affects WordPress sites that rely on W3 Total Cache for performance optimization, potentially compromising thousands of websites depending on the plugin's adoption rate. The attack surface is particularly concerning because caching systems are often used to store sensitive user data and session information, making the predictability of hash keys a critical security flaw. Organizations using this plugin may experience unauthorized data access, content tampering, and potential service disruption through cache manipulation attacks that leverage the predictable hash generation patterns.
Security mitigations for this vulnerability require immediate patching of the W3 Total Cache plugin to version 0.9.2.5 or later, which implements proper cryptographic hash generation with sufficient entropy. System administrators should also consider implementing additional monitoring for unusual cache access patterns and hash value predictions that could indicate exploitation attempts. The vulnerability aligns with ATT&CK technique T1566.002 for credential access through cache poisoning, and T1499.004 for data manipulation through cache tampering. Organizations should conduct thorough security assessments of their caching infrastructure and consider implementing more robust cryptographic implementations for hash generation. The incident highlights the importance of proper entropy in cryptographic operations and demonstrates how seemingly minor implementation flaws can create significant security vulnerabilities in widely used software components.