CVE-2008-5687 in MediaWiki
Summary
by MITRE
MediaWiki 1.11, and other versions before 1.13.3, does not properly protect against the download of backups of deleted images, which might allow remote attackers to obtain sensitive information via requests for files in images/deleted/.
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Analysis
by VulDB Data Team • 08/03/2021
MediaWiki versions prior to 1.13.3 contain a critical information disclosure vulnerability that stems from inadequate access controls within the backup restoration system. This vulnerability specifically affects the handling of deleted image files and allows remote attackers to bypass normal file access restrictions. The flaw exists in the directory structure where deleted images are stored under the images/deleted/ path, which should normally be protected from unauthorized access but instead remains accessible to any remote user who knows the specific path structure. The vulnerability arises from the lack of proper authentication checks and authorization mechanisms when accessing files within this deleted content directory, creating a direct pathway for attackers to retrieve backup copies of images that were previously deleted from the system.
The technical implementation of this vulnerability demonstrates a classic inadequate access control issue that maps to CWE-285, which addresses improper authorization within software systems. When MediaWiki processes requests for deleted image files, it fails to verify whether the requesting user has appropriate permissions to access the specific content being requested. This oversight occurs at the application layer where file access controls should be enforced before serving any content from the deleted images directory. The vulnerability essentially creates an information disclosure channel that allows attackers to access sensitive media content that was intended to be removed from public access but remains in backup form within the system's storage structure.
The operational impact of this vulnerability extends beyond simple information disclosure to potentially expose sensitive data contained within deleted images. Attackers could access copyrighted material, personal photographs, confidential documents, or any other content that was deleted from the MediaWiki system but still exists in backup form. This represents a significant security risk for organizations using MediaWiki for content management, particularly those handling sensitive information or operating under compliance requirements that mandate proper disposal of confidential data. The vulnerability affects not only the immediate content but also potentially exposes metadata and other associated information that might be embedded within the deleted image files, creating additional attack surface for malicious actors.
Security professionals should implement immediate mitigations including upgrading to MediaWiki version 1.13.3 or later, which includes proper access controls for deleted content directories. Organizations should also consider implementing additional network-level controls such as firewall rules that restrict access to the images/deleted/ directory path, though this represents a temporary workaround rather than a permanent solution. The vulnerability highlights the importance of proper access control implementation in content management systems and demonstrates how seemingly minor configuration issues can lead to significant information disclosure risks. System administrators should conduct thorough audits of their MediaWiki installations to identify any other potential access control gaps and ensure that all deleted content is properly secured according to industry best practices for information security management.
This vulnerability also aligns with ATT&CK technique T1005 which covers data from local system, and represents a failure in the system's information protection mechanisms. The attack vector requires minimal technical expertise and can be executed through simple HTTP requests, making it particularly dangerous as it can be exploited by automated scanning tools. Organizations should implement proper logging and monitoring of access attempts to deleted content directories to detect potential exploitation attempts. The vulnerability underscores the critical importance of maintaining up-to-date software versions and implementing comprehensive security testing procedures that include access control verification for all content management systems.