CVE-2012-1579 in MediaWiki
Summary
by MITRE
The resource loader in MediaWiki 1.17.x before 1.17.3 and 1.18.x before 1.18.2 includes private data such as CSRF tokens in a JavaScript file, which allows remote attackers to obtain sensitive information.
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Analysis
by VulDB Data Team • 03/22/2021
The vulnerability identified as CVE-2012-1579 represents a critical information disclosure flaw in MediaWiki's resource loading mechanism that persisted across multiple versions including 1.17.x before 1.17.3 and 1.18.x before 1.18.2. This issue stems from improper handling of sensitive data within JavaScript files that are publicly accessible, creating a significant security risk for wiki implementations that rely on MediaWiki's core functionality. The flaw specifically involves the inclusion of private data elements such as CSRF tokens in JavaScript resources that are served to all users regardless of their authentication status, making this information readily available to unauthorized parties.
The technical root cause of this vulnerability lies in the resource loader's failure to properly sanitize or separate sensitive data from public JavaScript files. When MediaWiki generates JavaScript resources for client-side operations, it inadvertently embeds authentication tokens and other private information within these files, which are then cached and served to any requesting client. This design flaw violates fundamental security principles of data separation and access control, as the system does not adequately distinguish between public and private data during the resource compilation process. The inclusion of CSRF tokens in JavaScript files creates a direct pathway for attackers to obtain session identifiers and authentication credentials that could be used to perform unauthorized actions on behalf of legitimate users.
The operational impact of this vulnerability extends beyond simple information disclosure, as it creates opportunities for session hijacking, cross-site request forgery attacks, and potential account takeovers. Attackers can harvest these tokens from the JavaScript files and use them to forge requests to the MediaWiki application, potentially gaining unauthorized access to user accounts, modifying content, or executing administrative functions. The vulnerability affects not only individual user sessions but also undermines the overall security posture of wiki implementations, particularly those with multiple users or administrative privileges. This flaw is particularly dangerous in environments where MediaWiki is used for collaborative content management, as it could enable malicious actors to compromise the integrity of shared information systems.
This vulnerability aligns with CWE-200, which addresses the exposure of sensitive information to an unauthorized actor, and represents a classic example of improper information flow control within web applications. The flaw also maps to ATT&CK technique T1566, which covers the use of credential dumping or information gathering techniques to extract sensitive data from applications. Organizations running affected MediaWiki versions should prioritize immediate remediation through the application of patches or configuration changes that ensure private data is properly separated from public JavaScript resources. The recommended mitigation involves implementing proper data sanitization within the resource loader component and ensuring that authentication tokens are only included in responses that require them, rather than being embedded in publicly accessible JavaScript files. Additionally, organizations should consider implementing web application firewalls and monitoring systems to detect unusual access patterns that might indicate exploitation attempts, while also reviewing their overall security configurations to prevent similar issues from occurring in other components of their web infrastructure.