Logged-in users with any role can delete arbitrary files in @saltcorn/server

Vulnerability Description

Saltcorn is an extensible, open source, no-code database application builder. A logged-in user with any role can delete arbitrary files on the filesystem by calling the `sync/clean_sync_dir` endpoint. The `dir_name` POST parameter is not validated/sanitized and is used to construct the `syncDir` that is deleted by calling `fs.rm`. This issue has been addressed in release version 1.0.0-beta16 and all users are advised to upgrade. There are no known workarounds for this vulnerability.

References

• https://github.com/saltcorn/saltcorn/security/advisories/GHSA-43f3-h63w-p6f6
• https://github.com/saltcorn/saltcorn/commit/3c551261d0e230635774798009951fa83a07cc3a
• https://github.com/saltcorn/saltcorn/blob/v1.0.0-beta.15/packages/server/routes/sync.js#L337-L346