A directory traversal vulnerability exists in rack < 2.2.0 that allows an attacker perform directory traversal vulnerability in the Rack::Directory app that is bundled with Rack which could result in information disclosure.
github.com/rack/rack
github.com/rack/rack/commit/dddb7ad18ed79ca6ab06ccc417a169fde451246e
github.com/rubysec/ruby-advisory-db/blob/master/gems/rack/CVE-2020-8161.yml
groups.google.com/forum/#!topic/ruby-security-ann/T4ZIsfRf2eA
groups.google.com/g/rubyonrails-security/c/IOO1vNZTzPA
lists.debian.org/debian-lts-announce/2020/07/msg00006.html
lists.debian.org/debian-lts-announce/2023/01/msg00038.html
nvd.nist.gov/vuln/detail/CVE-2020-8161
usn.ubuntu.com/4561-1