Detection Guidance

This vulnerability can be detected by monitoring requests to the Nextcloud Tables app that include numeric ID parameters used to access table column metadata. Specifically, look for authenticated user requests that modify the numeric ID in API calls to fetch column metadata. Since the vulnerability involves authorization bypass through manipulation of these IDs, commands or scripts that log and analyze HTTP requests to the Tables app endpoints for unusual or unauthorized access patterns can help detect exploitation attempts. For example, using network monitoring tools like tcpdump or Wireshark to capture HTTP traffic, or web server logs to identify requests with altered numeric IDs. Additionally, you can use curl commands to test if unauthorized metadata can be accessed by changing the numeric ID parameter in requests while authenticated. However, no specific detection commands are provided in the resources. [1]

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Executive Summary

This vulnerability in Nextcloud Tables allowed authenticated users to view metadata of columns in other users' tables by changing the numeric ID in a request. It affected versions prior to 0.8.7 and 0.9.4 and was fixed in those versions.

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Impact Analysis

The vulnerability could lead to unauthorized disclosure of metadata information about columns in other users' tables, potentially exposing sensitive structural information about data stored in the Tables app. However, it does not allow modification or deletion of data.

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Mitigation Strategies

To mitigate this vulnerability, update the Nextcloud Tables app to version 0.8.7 or 0.9.4 or later, as these versions contain the fix that prevents authenticated users from viewing metadata of columns in other tables by modifying numeric IDs in requests.

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Compliance Impact

This vulnerability allows authenticated users to view metadata of columns in other tables by bypassing authorization controls. Although the impact is limited to low confidentiality exposure of metadata (no integrity or availability impact), unauthorized access to metadata could potentially lead to compliance issues under standards like GDPR or HIPAA, which require strict access controls to protect personal or sensitive information. Organizations using affected versions of Nextcloud Tables should upgrade to patched versions to maintain compliance and prevent unauthorized data exposure. [1]

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