CVE-2021-22904: High severity rubyonrails Rails vulnerability

The actionpack ruby gem before 6.1.3.2, 6.0.3.7, 5.2.4.6, 5.2.6 suffers from a possible denial of service vulnerability in the Token Authentication logic in Action Controller due to a too permissive regular expression. Impacted code uses authenticateorrequestwithhttptoken or authenticatewithhttptoken for request authentication.

There is a possible DoS vulnerability in the Token Authentication logic in Action Controller. This vulnerability has been assigned the CVE identifier CVE-2021-22904.

Versions Affected: >= 4.0.0 Not affected: < 4.0.0 Fixed Versions: 6.1.3.2, 6.0.3.7, 5.2.4.6, 5.2.6

Impact ------ Impacted code uses authenticateorrequestwithhttptoken or authenticatewithhttptoken for request authentication. Impacted code will look something like this:

class PostsController < ApplicationController beforeaction :authenticate

private

def authenticate authenticateorrequestwithhttptoken do |token, options| # ... end end end

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 ----------- The following monkey patch placed in an initializer can be used to work around the issue:

ruby module ActionController::HttpAuthentication::Token AUTHNPAIRDELIMITERS = /(?:,|;|\t)/ end

Patches ------- To aid users who aren't able to upgrade immediately we have provided patches for the two supported release series. They are in git-am format and consist of a single changeset.

5-2-http-authentication-dos.patch - Patch for 5.2 series 6-0-http-authentication-dos.patch - Patch for 6.0 series 6-1-http-authentication-dos.patch - Patch for 6.1 series

Please note that only the 6.1.Z, 6.0.Z, and 5.2.Z series are supported at present. Users of earlier unsupported releases are advised to upgrade as soon as possible as we cannot guarantee the continued availability of security fixes for unsupported releases.

Credits ------- Thank you to https://hackerone.com/wondateacoffee for reporting this issue!

-- Aaron Patterson http://tenderlovemaking.com/

— Red Hat

There is a possible DoS vulnerability in the Token Authentication logic in Action Controller.

Versions Affected: >= 4.0.0 Not affected: < 4.0.0 Fixed Versions: 6.1.3.2, 6.0.3.7, 5.2.4.6, 5.2.6

Impact ------ Impacted code uses authenticateorrequestwithhttptoken or authenticatewithhttptoken for request authentication. Impacted code will look something like this:

class PostsController < ApplicationController beforeaction :authenticate

private

def authenticate authenticateorrequestwithhttptoken do |token, options| # ... end end end

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 ----------- The following monkey patch placed in an initializer can be used to work around the issue:

ruby module ActionController::HttpAuthentication::Token AUTHNPAIRDELIMITERS = /(?:,|;|\t)/ end

Patches ------- To aid users who aren't able to upgrade immediately we have provided patches for the two supported release series. They are in git-am format and consist of a single changeset.

5-2-http-authentication-dos.patch - Patch for 5.2 series 6-0-http-authentication-dos.patch - Patch for 6.0 series 6-1-http-authentication-dos.patch - Patch for 6.1 series

Please note that only the 6.1.Z, 6.0.Z, and 5.2.Z series are supported at present. Users of earlier unsupported releases are advised to upgrade as soon as possible as we cannot guarantee the continued availability of security fixes for unsupported releases.

Credits ------- Thank you to https://hackerone.com/wondateacoffee for reporting this issue!