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Rack allows Percent-encoded cookies to overwrite existing prefixed cookie names

High severity GitHub Reviewed Published Jun 24, 2020 to the GitHub Advisory Database • Updated Aug 28, 2023

Package

bundler rack (RubyGems)

Affected versions

< 2.1.4
>= 2.2.0, < 2.2.3

Patched versions

2.1.4
2.2.3

Description

A reliance on cookies without validation/integrity check security vulnerability exists in rack < 2.2.3, rack < 2.1.4 that makes it possible for an attacker to forge a secure or host-only cookie prefix.

References

Published by the National Vulnerability Database Jun 19, 2020
Reviewed Jun 24, 2020
Published to the GitHub Advisory Database Jun 24, 2020
Last updated Aug 28, 2023

Severity

High

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
None
Integrity
High
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:N/I:H/A:N

EPSS score

0.171%
(55th percentile)

Weaknesses

CVE ID

CVE-2020-8184

GHSA ID

GHSA-j6w9-fv6q-3q52

Source code

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