CVE-2012-6077 in Total Cache
Summary
by MITRE
W3 Total Cache before 0.9.2.5 allows remote attackers to retrieve password hash information due to insecure storage of database cache files.
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Analysis
by VulDB Data Team • 11/23/2019
The vulnerability identified as CVE-2012-6077 affects the W3 Total Cache plugin for WordPress systems prior to version 0.9.2.5, representing a critical security flaw in how the plugin handles database cache file storage. This issue falls under the category of insecure data storage and configuration mismanagement, with implications that extend beyond simple information disclosure to potentially enable credential compromise and further system exploitation. The vulnerability specifically targets the plugin's approach to caching database query results, which are stored in files that are subsequently accessible to unauthorized parties. The insecure storage mechanism allows attackers to obtain password hash information through direct file access, creating a significant attack surface for malicious actors seeking to escalate privileges within affected WordPress environments.
The technical implementation of this vulnerability stems from the plugin's failure to properly secure cache files containing sensitive database information. When W3 Total Cache stores database query results for performance optimization, it creates cache files that are accessible through the web root or other publicly accessible directories. These cache files contain not only database query results but also embedded password hashes and other authentication-related data that should never be exposed to external parties. The flaw manifests when the plugin does not implement proper access controls or file permissions on cache directories, allowing remote attackers to retrieve these files directly through HTTP requests. This misconfiguration creates a persistent vulnerability that can be exploited across multiple sessions and user interactions, making it particularly dangerous for high-traffic websites that rely heavily on caching mechanisms.
From an operational impact perspective, this vulnerability creates multiple attack vectors for threat actors seeking to compromise WordPress installations. The disclosure of password hashes enables attackers to perform offline password cracking attacks using tools like john the ripper or hashcat, potentially leading to full system compromise. The vulnerability affects not only standard user credentials but also administrative access tokens and other sensitive authentication data stored within the cached database queries. Security professionals must consider the broader implications of such information disclosure, as password hashes can be used for credential stuffing attacks across other platforms where users may have reused passwords. The attack surface extends to include not just the immediate WordPress installation but also potential cross-platform exploitation if users have employed similar credentials elsewhere.
Mitigation strategies for CVE-2012-6077 require immediate action to upgrade the W3 Total Cache plugin to version 0.9.2.5 or later, which addresses the insecure file storage mechanism. Organizations should implement proper file access controls and ensure that cache directories are not accessible through web requests, typically achieved through proper directory permissions and web server configuration. The remediation process should include reviewing all cache file locations and implementing restrictive access controls that prevent direct file access while maintaining the plugin's caching functionality. Security teams must also conduct comprehensive audits of all WordPress plugins and themes to identify similar insecure storage patterns and implement monitoring solutions to detect unauthorized access attempts to cache files. The vulnerability demonstrates the importance of following secure coding practices and proper input validation, aligning with CWE-200 standards for information disclosure and CWE-732 for incorrect permission assignment. Organizations should also consider implementing network-based intrusion detection systems to monitor for access patterns that might indicate exploitation attempts targeting cached data files.