Executive Summary

This vulnerability is a missing authorization check in the Backend Routing of TYPO3 CMS versions 9.0.0 to 13.4.17. It allows authenticated backend users to directly invoke AJAX backend routes without having access to the corresponding backend modules. This happens because the AJAX routes lacked the same permission checks as the modules themselves, enabling unauthorized users to bypass module-level restrictions and potentially read, modify, or delete data. [1]

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Impact Analysis

The vulnerability can impact you by allowing authenticated backend users who do not have proper permissions to access certain backend modules to still invoke AJAX routes related to those modules. This can lead to unauthorized reading, modification, or deletion of data, effectively bypassing the intended access controls and potentially compromising the integrity and confidentiality of your data. [1]

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Detection Guidance

The vulnerability involves backend users invoking AJAX backend routes without proper authorization. Detection can focus on monitoring backend AJAX route requests that bypass module permissions. You can inspect web server logs or use network monitoring tools to identify suspicious AJAX calls to TYPO3 backend routes. Specific commands are not provided in the resources, but typical approaches include using tools like curl or wget to test AJAX endpoints for unauthorized access, or using log analysis commands such as 'grep' to find AJAX route invocations in server logs. [1]

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Mitigation Strategies

The immediate mitigation step is to update TYPO3 CMS to the fixed versions: 9.5.55 ELTS, 10.4.54 ELTS, 11.5.48 ELTS, 12.4.37 LTS, or 13.4.18 LTS. These versions introduce the 'inheritAccessFromModule' property for AJAX routes, ensuring proper permission checks. Additionally, developers should verify authorization on target resources within AJAX handlers or controllers to prevent unauthorized access. [1]

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