CVE-2022-29970: sinatra does not validate expanded path matches

May 2, 2022 (updated November 16, 2022)

Sinatra before 2.2.0 does not validate that the expanded path matches public_dir when serving static files.

References

github.com/advisories/GHSA-qp49-3pvw-x4m5
github.com/sinatra/sinatra/pull/1683/commits/462c3ca1db53ed3cfc394cf5948e9c948ad1c10e
github.com/skylightio/skylight-ruby/pull/294
nvd.nist.gov/vuln/detail/CVE-2022-29970

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