SB2025062650 - Race condition in Rack

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2025-32441)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a remote user to escalate privileges on the system.

The vulnerability exists because when using the `Rack::Session::Pool` middleware, simultaneous rack requests can restore a deleted rack session. A remote user can trigger a long running request (within that same session) adjacent to the user logging out, in order to retain illicit access even after a user has attempted to logout.

Remediation

Install update from vendor's website.

References

• https://github.com/rack/rack/blob/v2.2.13/lib/rack/session/abstract/id.rb#L263-L270
• https://github.com/rack/rack/commit/c48e52f7c57e99e1e1bf54c8760d4f082cd1c89d
• https://github.com/rack/rack/security/advisories/GHSA-vpfw-47h7-xj4g