Denial of Service Vulnerability in Action View

Impact ------ Specially crafted accept headers can cause the Action View template location code to consume 100% CPU, causing the server unable to process requests. This impacts all Rails applications that render views.

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

Releases -------- The 6.0.0.beta3, 5.2.2.1, 5.1.6.2, 5.0.7.2, and 4.2.11.1 releases are available at the normal locations.

Workarounds ----------- This vulnerability can be mitigated by wrapping render calls with respondto blocks. For example, the following example is vulnerable:

ruby class UserController < ApplicationController def index render "index" end end

But the following code is not vulnerable:

ruby class UserController < ApplicationController def index respondto |format| format.html { render "index" } end end end

Implicit rendering is impacted, so this code is vulnerable:

ruby class UserController < ApplicationController def index end end

But can be changed this this:

ruby class UserController < ApplicationController def index respondto |format| format.html { render "index" } end end end

Alternatively to specifying the format, the following monkey patch can be applied in an initializer:

$ cat config/initializers/formatsfilter.rb frozenstringliteral: true

ActionDispatch::Request.prepend(Module.new do def formats super().select do |format| format.symbol || format.ref == "/" end end end)

Please note that only the 5.2.x, 5.1.x, 5.0.x, and 4.2.x 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.

Also note that the patches for this vulnerability are the same as CVE-2019-5418.

Credits ------- Thanks to John Hawthorn <john@hawthorn.email> of GitHub

It was found that Sinatra is vulnerable to an XSS via the 400 Bad Request page that occurs upon a params parser exception.

Upstream issue:

https://github.com/sinatra/sinatra/issues/1428

Introduced by:

https://github.com/sinatra/sinatra/commit/8f8df53ff29938ace79b31097c27d9cdac803b44

Upstream patch:

https://github.com/sinatra/sinatra/commit/12786867d6faaceaec62c7c2cb5b0e2dc074d71a

cfme-gemset versions 5.10.4.3 and below, 5.9.9.3 and below are vulnerable to a data leak, due to an improper authorization in the migration log controller. An attacker with access to an unprivileged user can access all VM migration logs available.