CVE-2018-13258 in Web Access
Summary
by MITRE
Mediawiki 1.31 before 1.31.1 misses .htaccess files in the provided tarball used to protect some directories that shouldn't be web accessible.
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Analysis
by VulDB Data Team • 05/22/2023
The vulnerability identified as CVE-2018-13258 affects MediaWiki versions prior to 1.31.1, specifically addressing a critical configuration oversight in the distribution package. This flaw represents a failure in the software's security hardening process where essential access control mechanisms were omitted from the tarball distribution. The issue stems from the absence of .htaccess files that are crucial for restricting web access to sensitive directories within the MediaWiki installation. These missing files create a pathway for unauthorized access to potentially sensitive data and system components that should remain protected from direct web exposure. The vulnerability directly impacts the principle of least privilege by failing to implement proper access controls at the web server level.
The technical flaw manifests as a misconfiguration in the web server access control implementation where the .htaccess files that normally restrict access to directories containing configuration files, cache data, and other sensitive components are not included in the distribution package. This omission allows web users to potentially access directories that contain database credentials, session data, temporary files, and other confidential information that should remain protected from external access. The vulnerability is classified under CWE-276 as improper file permissions, specifically related to inadequate access control mechanisms. Attackers could exploit this weakness to gain unauthorized access to system configuration details, potentially leading to privilege escalation or data exfiltration.
The operational impact of this vulnerability extends beyond simple information disclosure to encompass potential system compromise and data integrity violations. When .htaccess files are missing from the MediaWiki installation, attackers can potentially access sensitive directories that contain user session data, cache files, and configuration information that may reveal system architecture details. This exposure could facilitate more sophisticated attacks such as session hijacking, where attackers gain access to active user sessions, or credential theft through exposure of database connection strings and other authentication parameters. The vulnerability aligns with ATT&CK technique T1213.001 for Data from Information Repositories, as it provides unauthorized access to repository contents that should remain protected. Organizations using affected MediaWiki versions face increased risk of data breaches and potential system compromise.
Mitigation strategies for this vulnerability require immediate implementation of manual .htaccess file deployment or upgrade to MediaWiki 1.31.1 or later versions where the issue has been resolved. System administrators should verify that all sensitive directories are properly protected by implementing appropriate access controls at the web server level, including the addition of .htaccess files that restrict access to directories containing configuration data, cache files, and temporary storage areas. The remediation process should include comprehensive review of directory permissions and access controls to ensure that no sensitive data remains exposed to web access. Additionally, organizations should implement regular security audits to verify that all necessary access control mechanisms are properly configured and maintained. This vulnerability underscores the importance of proper security hardening in software distribution packages and highlights the necessity of automated security checks during software deployment processes to prevent similar configuration oversights.