Directory Traversal The advisory has been revoked - it doesn't affect any version of package ruby-rack-cors (opens in a new tab)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UBUNTU2010-RUBYRACKCORS-1030886
- published15 Nov 2019
- disclosed14 Nov 2019
Introduced: 14 Nov 2019
CVE-2019-18978 (opens in a new tab)Amendment
The Ubuntu security team deemed this advisory irrelevant for Ubuntu:20.10.
NVD Description
Note: Versions mentioned in the description apply only to the upstream ruby-rack-cors package and not the ruby-rack-cors package as distributed by Ubuntu.
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
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2019-18978
- https://www.debian.org/security/2021/dsa-4918
- https://lists.debian.org/debian-lts-announce/2020/02/msg00004.html
- https://security-tracker.debian.org/tracker/CVE-2019-18978
- https://github.com/cyu/rack-cors/commit/e4d4fc362a4315808927011cbe5afcfe5486f17d
- https://github.com/cyu/rack-cors/compare/v1.0.3...v1.0.4
- https://lists.debian.org/debian-lts-announce/2020/10/msg00000.html
- https://usn.ubuntu.com/4571-1/