Secure/signed cookies share secrets between sites in a multi-site application
Published: November 15, 2021
SECURITY IDENTIFIERS
- CVE: CVE-2021-41263 (NVD)
- GHSA: GHSA-844m-cpr9-jcmh
- Vendor Advisory: https://github.com/discourse/rails_multisite/security/advisories/GHSA-844m-cpr9-jcmh
GEM
SEVERITY
CVSS v3.x: 6.2 (Medium)
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.