Directus `search` query parameter allows enumeration of non permitted fields

Vulnerability Description

Directus is a real-time API and App dashboard for managing SQL database content. Starting in version 9.0.0-alpha.4 and prior to version 11.5.0, the `search` query parameter allows users with access to a collection to filter items based on fields they do not have permission to view. This allows the enumeration of unknown field contents. The searchable columns (numbers & strings) are not checked against permissions when injecting the `where` clauses for applying the search query. This leads to the possibility of enumerating those un-permitted fields. Version 11.5.0 fixes the issue.

References

• https://github.com/directus/directus/security/advisories/GHSA-7wq3-jr35-275c
• https://github.com/directus/directus/commit/ac5a9964d9926f20dc063a74cb417dc7bbad676d