Vulnerability Instance

Rails has possible Sensitive Session Information Leak in Active Storage
# Possible Sensitive Session Information Leak in Active Storage

There is a possible sensitive session information leak in Active Storage.  By
default, Active Storage sends a `Set-Cookie` header along with the user's
session cookie when serving blobs.  It also sets `Cache-Control` to public.
Certain proxies may cache the Set-Cookie, leading to an information leak.

This vulnerability has been assigned the CVE identifier CVE-2024-26144.

Versions Affected:  >= 5.2.0, < 7.1.0
Not affected:       < 5.2.0, > 7.1.0
Fixed Versions:     7.0.8.1, 6.1.7.7

Impact
------
A proxy which chooses to caches this request can cause users to share
sessions. This may include a user receiving an attacker's session or vice
versa.

This was patched in 7.1.0 but not previously identified as a security
vulnerability.

All users running an affected release should either upgrade or use one of the
workarounds immediately.

Releases
--------
The fixed releases are available at the normal locations.

Workarounds
-----------
Upgrade to Rails 7.1.X, or configure caching proxies not to cache the
Set-Cookie headers.

Credits
-------

Thanks to [tyage](https://hackerone.com/tyage) for reporting this!