Package Instance

Action Pack contains Information Disclosure / Unintended Method Execution vulnerability
Impact
------
There is a possible information disclosure / unintended method execution vulnerability in Action Pack when using the `redirect_to` or `polymorphic_url` helper with untrusted user input.

Vulnerable code will look like this.

```
redirect_to(params[:some_param])
```

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
-----------
To work around this problem, it is recommended to use an allow list for valid parameters passed from the user.  For example,

```ruby
private def check(param)
  case param
  when "valid"
    param
  else
    "/"
  end
end

def index
  redirect_to(check(params[:some_param]))
end
```

Or force the user input to be cast to a string like this,

```ruby
def index
  redirect_to(params[:some_param].to_s)
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-information-disclosure.patch - Patch for 5.2 series
* 6-0-information-disclosure.patch - Patch for 6.0 series
* 6-1-information-disclosure.patch - Patch for 6.1 series

Please note that only the 5.2, 6.0, and 6.1 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
-------

Thanks to Benoit Côté-Jodoin from Shopify for reporting this.

Possible DoS Vulnerability in Action Controller Token Authentication
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 `authenticate_or_request_with_http_token` or `authenticate_with_http_token` for request authentication.  Impacted code will look something like this:

```
class PostsController < ApplicationController
  before_action :authenticate

  private

  def authenticate
    authenticate_or_request_with_http_token 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
  AUTHN_PAIR_DELIMITERS = /(?:,|;|\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/wonda_tea_coffee for reporting this issue!

Denial of Service in Action Dispatch
Impact
------
There is a possible Denial of Service vulnerability in Action Dispatch. Carefully crafted Accept headers can cause the mime type parser in Action Dispatch to do catastrophic backtracking in the regular expression engine.

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 Mime
  class Type
    MIME_REGEXP = /\A(?:\*\/\*|#{MIME_NAME}\/(?:\*|#{MIME_NAME})(?>\s*#{MIME_PARAMETER}\s*)*)\z/
  end
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.

* 6-0-Prevent-catastrophic-backtracking-during-mime-parsin.patch - Patch for 6.0 series
* 6-1-Prevent-catastrophic-backtracking-during-mime-parsin.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
-------

Thanks to Security Curious <security...@pm.me> for reporting this!