CVE-2019-18978

Description

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.

Category

5.3
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.78% Top 30%
Vendor Advisory ubuntu.com Vendor Advisory debian.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://github.com/cyu/rack-cors/commit/e4d4fc362a4315808927011cbe5afcfe5486f17d third party advisory patch
https://github.com/cyu/rack-cors/compare/v1.0.3...v1.0.4 third party advisory patch
https://lists.debian.org/debian-lts-announce/2020/02/msg00004.html third party advisory mailing list
https://lists.debian.org/debian-lts-announce/2020/10/msg00000.html third party advisory mailing list
https://usn.ubuntu.com/4571-1/ third party advisory vendor advisory
https://www.debian.org/security/2021/dsa-4918 third party advisory vendor advisory

Frequently Asked Questions

What is the severity of CVE-2019-18978?
CVE-2019-18978 has been scored as a medium severity vulnerability.
How to fix CVE-2019-18978?
To fix CVE-2019-18978, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2019-18978 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2019-18978 is being actively exploited. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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