CVE-2012-6079 in Total Cache
Summary
by MITRE
W3 Total Cache before 0.9.2.5 exposes sensitive cached database information which allows remote attackers to download this information via their hash keys.
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Analysis
by VulDB Data Team • 11/23/2019
The W3 Total Cache plugin for WordPress represents one of the most widely used caching solutions in the web application ecosystem, designed to improve website performance by caching various elements including database queries and page content. This particular vulnerability affects versions prior to 0.9.2.5 and stems from a critical flaw in how the plugin handles cached database information. The vulnerability manifests when the plugin caches database query results and stores them in a manner that exposes these cached elements through predictable hash key access patterns. Attackers can exploit this weakness by directly accessing cached database information through specific hash keys, bypassing normal authentication and authorization mechanisms that should protect sensitive database content.
The technical implementation of this vulnerability involves the plugin's caching mechanism storing database query results in a way that creates predictable access points for cached data. When database queries are cached, the system generates hash keys based on query parameters and other identifying factors, but these keys become predictable and accessible to unauthorized users. The flaw allows remote attackers to construct specific requests using these hash keys to retrieve cached database information, which may include sensitive user data, configuration details, or other database content that should remain protected. This issue is particularly dangerous because it operates at the caching layer, meaning that even if the underlying database is properly secured, the cached representations can still be accessed by attackers who understand the hash key generation patterns.
The operational impact of this vulnerability extends beyond simple data exposure, as cached database information often contains user credentials, session data, personal information, and other sensitive elements that could be leveraged for further attacks. An attacker who successfully exploits this vulnerability can gain access to cached database results that may include user account details, administrative information, or other confidential data that was previously protected by the WordPress security model. This exposure creates a persistent threat vector that remains active as long as the cache is not properly invalidated or secured. The vulnerability aligns with CWE-200, which describes improper exposure of sensitive information, and represents a classic case of insecure data handling at the application layer where cached content becomes a security risk due to inadequate access controls.
Mitigation strategies for this vulnerability require immediate plugin updates to version 0.9.2.5 or later, which contain fixes addressing the cached data exposure issue. Administrators should also implement proper cache invalidation procedures and ensure that cached database information is properly secured through access controls that prevent unauthorized retrieval. Additional defensive measures include implementing network-level restrictions to limit access to cached content, monitoring cache access patterns for suspicious activity, and regularly auditing cached data to identify potential exposure risks. The vulnerability demonstrates the importance of secure caching practices and highlights how even well-established security controls can be bypassed when caching mechanisms are not properly designed with security in mind. Organizations should consider implementing the principle of least privilege for cache access and ensure that sensitive database information is not stored in easily accessible cached formats without proper encryption or access controls. This issue also underscores the need for comprehensive security testing of caching mechanisms and the importance of following secure coding practices that prevent information leakage through predictable access patterns.