Package Instance

actionview contains Path Traversal vulnerability
There is a possible directory traversal and information leak vulnerability in Action View. This was meant to be fixed on CVE-2016-0752. However the 3.2 patch was not covering all possible scenarios. This vulnerability has been assigned the CVE identifier CVE-2016-2097.

Versions Affected:  3.2.x, 4.0.x, 4.1.x
Not affected:       4.2+
Fixed Versions:     3.2.22.2, 4.1.14.2

Impact
------
Applications that pass unverified user input to the `render` method in a controller may be vulnerable to an information leak vulnerability.

Impacted code will look something like this:

```ruby
def index
  render params[:id]
end
```

Carefully crafted requests can cause the above code to render files from unexpected places like outside the application's view directory, and can possibly escalate this to a remote code execution attack.

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
-----------
A workaround to this issue is to not pass arbitrary user input to the `render` method. Instead, verify that data before passing it to the `render` method.

For example, change this:

```ruby
def index
  render params[:id]
end
```

To this:

```ruby
def index
  render verify_template(params[:id])
end

private
def verify_template(name)
  # add verification logic particular to your application here
end
```

Patches
-------
To aid users who aren't able to upgrade immediately we have provided patches for it. It is in git-am format and consist of a single changeset.

* 3-2-render_data_leak_2.patch - Patch for 3.2 series
* 4-1-render_data_leak_2.patch - Patch for 4.1 series

Credits
-------
Thanks to both Jyoti Singh and Tobias Kraze from makandra for reporting this and working with us in the patch!

actionpack allows remote code execution via application's unrestricted use of render method
Action Pack in Ruby on Rails before 3.2.22.2, 4.x before 4.1.14.2, and 4.2.x before 4.2.5.2 allows remote attackers to execute arbitrary Ruby code by leveraging an application's unrestricted use of the render method.

actionpack is vulnerable to denial of service because of a wildcard controller route
actionpack/lib/action_dispatch/routing/route_set.rb in Action Pack in Ruby on Rails 4.x before 4.2.5.1 and 5.x before 5.0.0.beta1.1 allows remote attackers to cause a denial of service (superfluous caching and memory consumption) by leveraging an application's use of a wildcard controller route.

Active Record Improper Access Control
`activerecord/lib/active_record/nested_attributes.rb` in Active Record in Ruby on Rails 3.1.x and 3.2.x before 3.2.22.1, 4.0.x and 4.1.x before 4.1.14.1, 4.2.x before 4.2.5.1, and 5.x before 5.0.0.beta1.1 does not properly implement a certain destroy option, which allows remote attackers to bypass intended change restrictions by leveraging use of the nested attributes feature.

actionpack is vulnerable to denial of service via a crafted HTTP Accept header
actionpack/lib/action_dispatch/http/mime_type.rb in Action Pack in Ruby on Rails before 3.2.22.1, 4.0.x and 4.1.x before 4.1.14.1, 4.2.x before 4.2.5.1, and 5.x before 5.0.0.beta1.1 does not properly restrict use of the MIME type cache, which allows remote attackers to cause a denial of service (memory consumption) via a crafted HTTP Accept header.

actionpack is vulnerable to remote bypass authentication
The http_basic_authenticate_with method in actionpack/lib/action_controller/metal/http_authentication.rb in the Basic Authentication implementation in Action Controller in Ruby on Rails before 3.2.22.1, 4.0.x and 4.1.x before 4.1.14.1, 4.2.x before 4.2.5.1, and 5.x before 5.0.0.beta1.1 does not use a constant-time algorithm for verifying credentials, which makes it easier for remote attackers to bypass authentication by measuring timing differences.