ruby-advisory-db/gems/rack/CVE-2025-32441.yml at master · rubysec/ruby-advisory-db · GitHub

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---
gem: rack
cve: 2025-32441
ghsa: vpfw-47h7-xj4g
url: https://github.com/rack/rack-session/security/advisories/GHSA-9j94-67jr-4cqj
title: Rack session gets restored after deletion
date: 2025-05-08
description: |
  ### Summary

  When using the `Rack::Session::Pool` middleware, simultaneous rack
  requests can restore a deleted rack session, which allows the
  unauthenticated user to occupy that session.

  ### Details

  [Rack session middleware](https://github.com/rack/rack/blob/v2.2.13/lib/rack/session/abstract/id.rb#L263-L270)
  prepares the session at the beginning of request, then saves is back
  to the store with possible changes applied by host rack application.
  This way the session becomes to be a subject of race conditions in
  general sense over concurrent rack requests.

  ### Impact

  When using the `Rack::Session::Pool` middleware, and provided the
  attacker can acquire a session cookie (already a major issue), the
  session may be restored if the attacker 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.

  ## Mitigation

  - Update to the latest version of `rack`, or
  - Ensure your application invalidates sessions atomically by marking
    them as logged out e.g., using a `logged_out` flag, instead of
    deleting them, and check this flag on every request to prevent reuse, or
  - Implement a custom session store that tracks session invalidation
    timestamps and refuses to accept session data if the session was
    invalidated after the request began.

  ### Related

  As this code was moved to `rack-session` in Rack 3+, see
  <https://github.com/rack/rack-session/security/advisories/GHSA-9j94-67jr-4cqj>
  for the equivalent advisory in `rack-session` (affecting Rack 3+ only).
cvss_v3: 4.2
patched_versions:
  - ">= 2.2.14"
related:
  ghsa:
    - 9j94-67jr-4cqj
  url:
    - https://nvd.nist.gov/vuln/detail/CVE-2025-32441
    - https://github.com/rack/rack/security/advisories/GHSA-vpfw-47h7-xj4g
    - https://github.com/rack/rack/commit/c48e52f7c57e99e1e1bf54c8760d4f082cd1c89d
    - https://github.com/rack/rack/blob/v2.2.13/lib/rack/session/abstract/id.rb#L263-L270
    - https://github.com/rack/rack-session/security/advisories/GHSA-9j94-67jr-4cqj
    - https://github.com/advisories/GHSA-vpfw-47h7-xj4g