GHSA-7wqh-767x-r66v Local File Inclusion in Rack::Static

• RubyGems rack: < 2.2.13 → fixed in 2.2.13 • RubyGems rack: >= 3.0, < 3.0.14 → fixed in 3.0.14 • RubyGems rack: >= 3.1, < 3.1.12 → fixed in 3.1.12

Summary `Rack::Static` can serve files under the specified `root:` even if `urls:` are provided, which may expose other files under the specified `root:` unexpectedly. Details The vulnerability occurs because `Rack::Static` does not properly sanitize user-supplied paths before serving files. Specifically, encoded path traversal sequences are not correctly validated, allowing attackers to access files outside the designated static file directory. Impact By exploiting this vulnerability, an attacker can gain access to all files under the specified `root:` directory, provided they are able to determine then path of the file. Mitigation • Update to the latest version of Rack, or • Remove usage of `Rack::Static`, or • Ensure that `root:` points at a directory path which only contains files which should be accessed publicly. It is likely that a CDN or similar static file server would also mitigate the issue.