GHSA-rcvq-m9j9-6f4g
@hapi/inert has a static-file confinement bypass via sibling-prefix path
Details
### Impact `@hapi/inert` serves static files from a directory configured with `path` (in the `directory` / `file` handlers) or `relativeTo` (for `h.file()`), with confinement enforced by the `confine` option (default `true`). Before the patch, the confinement check compared the resolved absolute path against the confine directory using a raw string-prefix test, so a sibling directory whose absolute path begins with the same characters as the confine directory (eg. `/app/static-secret` next to a served `/app/static`) was incorrectly accepted as confined. An unauthenticated remote attacker who knows or guesses such a sibling name can read any file inside it via a request like `/..%2fstatic-secret/secret.txt`, provided the file is readable by the server process. Only applications that happen to have a sibling directory sharing a string prefix with the served directory are exploitable; applications with no such sibling are unaffected.
### Patches Upgrade to 7.1.1.
### Workarounds For users who cannot upgrade immediately: ensure the directory served via inert has no sibling whose name starts with the same characters (for example, rename `static-secret/` to `secret/`, or move it to a different parent directory).
### Resources Pull Request: https://github.com/hapijs/inert/pull/176
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