CVE-2012-4382 in MediaWiki
Summary
by MITRE
MediaWiki before 1.18.5, and 1.19.x before 1.19.2 does not properly protect user block metadata, which allows remote administrators to read a user block reason via a reblock attempt.
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Analysis
by VulDB Data Team • 04/12/2021
The vulnerability identified as CVE-2012-4382 affects MediaWiki versions prior to 1.18.5 and 1.19.x versions prior to 1.19.2, representing a critical information disclosure flaw in the wiki platform's user management system. This vulnerability specifically targets the protection mechanisms surrounding user block metadata, which are essential components of the wiki's administrative controls and security framework.
The technical flaw manifests in the improper handling of user block reason information during reblock operations. When remote administrators attempt to reblock users, the system fails to adequately sanitize or protect the block reason metadata, allowing unauthorized access to sensitive information that should remain confidential. This occurs because the reblock functionality does not properly validate or restrict access to existing block reason details, creating an information leakage channel that bypasses normal access control mechanisms.
The operational impact of this vulnerability extends beyond simple information disclosure, as it compromises the integrity of the wiki's administrative security model. Attackers with remote administrative privileges can exploit this flaw to access confidential user block reasons, potentially revealing sensitive information about user activities, security policies, or internal administrative decisions. This vulnerability undermines the trust model of the wiki platform and could enable more sophisticated attacks by providing attackers with intelligence about user behavior or system vulnerabilities.
From a cybersecurity perspective, this vulnerability aligns with CWE-200, which describes improper exposure of sensitive information, and represents a failure in access control implementation. The flaw also intersects with ATT&CK technique T1566, which covers credential access through social engineering, as the information disclosure could be leveraged to craft more convincing social engineering attacks against users or administrators. The vulnerability demonstrates a classic case of insufficient input validation and inadequate privilege separation in web applications.
Organizations running affected MediaWiki versions should immediately implement the patch updates to 1.18.5 or 1.19.2, which address the metadata protection issue through proper access control enforcement during reblock operations. Additionally, administrators should review existing user block reasons for potential exposure and consider implementing additional monitoring for suspicious administrative activities. The remediation process should include thorough testing to ensure that the patch does not introduce regressions in legitimate administrative functions while maintaining the enhanced security protections.