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Rails Multisite secure/signed cookies share secrets between sites in a multi-site application

Moderate severity GitHub Reviewed Published Nov 15, 2021 in discourse/rails_multisite • Updated May 4, 2023

Package

bundler rails_multisite (RubyGems)

Affected versions

< 4.0.0

Patched versions

4.0.0

Description

Impact

This vulnerability impacts any Rails applications using rails_multisite alongside Rails' signed/encrypted cookies. Depending on how the application makes use of these cookies, it may be possible for an attacker to re-use cookies on different 'sites' within a multi-site Rails application.

Patches

The issue has been patched in v4 of the rails_multisite gem. Note that this upgrade will invalidate all previous signed/encrypted cookies. The impact of this invalidation will vary based on the application architecture.

References

@jomaxro jomaxro published to discourse/rails_multisite Nov 15, 2021
Reviewed Nov 15, 2021
Published to the GitHub Advisory Database Nov 15, 2021
Published by the National Vulnerability Database Nov 15, 2021
Last updated May 4, 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
High
Privileges required
High
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
High

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:H/PR:H/UI:N/S:U/C:H/I:L/A:H

EPSS score

0.104%
(44th percentile)

Weaknesses

CVE ID

CVE-2021-41263

GHSA ID

GHSA-844m-cpr9-jcmh

Source code

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