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The rack-cors rubygem may allow directory traveral

Moderate severity GitHub Reviewed Published Nov 15, 2019 to the GitHub Advisory Database • Updated Jan 23, 2023

Package

bundler rack-cors (RubyGems)

Affected versions

< 1.0.4

Patched versions

1.0.4

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.

References

Published by the National Vulnerability Database Nov 14, 2019
Reviewed Nov 15, 2019
Published to the GitHub Advisory Database Nov 15, 2019
Last updated Jan 23, 2023

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS score

0.438%
(75th percentile)

Weaknesses

CVE ID

CVE-2019-18978

GHSA ID

GHSA-pf8f-w267-mq2h

Source code

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