CVE-2019-18978: Path Traversal

November 14, 2019 (updated November 18, 2019)

An issue was discovered in the rack-cors (aka Rack CORS Middleware) gem for Ruby. It allows directory traversal through .. to access private resources because resource matching does not ensure that pathnames are in a canonical format.

References

nvd.nist.gov/vuln/detail/CVE-2019-18978

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