GHSA-pf8f-w267-mq2h

The rack-cors rubygem may allow directory traveral

Source: GitHub Advisory Database (reviewed) Moderate CVE-2019-18978

Packages

Ecosystem	Package	Affected	Fixed in
RubyGems	rack-cors	< 1.0.4	1.0.4

Details

As written in the advisory (Markdown source, shown as plain text).

An issue was discovered in the rack-cors (aka Rack CORS Middleware) gem before 1.0.4 for Ruby. It allows ../ directory traversal to access private resources because resource matching does not ensure that pathnames are in a canonical format.

References

External links from the advisory. They lead to third-party sites.

https://nvd.nist.gov/vuln/detail/CVE-2019-18978 advisory
https://github.com/cyu/rack-cors/commit/e4d4fc362a4315808927011cbe5afcfe5486f17d web
https://github.com/cyu/rack-cors package
https://github.com/cyu/rack-cors/compare/v1.0.3...v1.0.4 web
https://lists.debian.org/debian-lts-announce/2020/02/msg00004.html web
https://lists.debian.org/debian-lts-announce/2020/10/msg00000.html web
https://usn.ubuntu.com/4571-1 web
https://www.debian.org/security/2021/dsa-4918 web