high
7.5
CWE
22
Advisory Published
CVE Published
Updated

CVE-2019-5418: Path Traversal

First published: Wed Mar 13 2019(Updated: )

# File Content Disclosure in Action View Impact ------ There is a possible file content disclosure vulnerability in Action View. Specially crafted accept headers in combination with calls to `render file:` can cause arbitrary files on the target server to be rendered, disclosing the file contents. The impact is limited to calls to `render` which render file contents without a specified accept format. Impacted code in a controller looks something like this: ``` ruby class UserController < ApplicationController def index render file: "#{Rails.root}/some/file" end end ``` Rendering templates as opposed to files is not impacted by this vulnerability. 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 specifying a format for file rendering, like this: ``` ruby class UserController < ApplicationController def index render file: "#{Rails.root}/some/file", formats: [:html] end end ``` In summary, impacted calls to `render` look like this: ``` render file: "#{Rails.root}/some/file" ``` The vulnerability can be mitigated by changing to this: ``` render file: "#{Rails.root}/some/file", formats: [:html] ``` Other calls to `render` are not impacted. Alternatively, the following monkey patch can be applied in an initializer: ``` ruby $ cat config/initializers/formats_filter.rb # frozen_string_literal: true ActionDispatch::Request.prepend(Module.new do def formats super().select do |format| format.symbol || format.ref == "*/*" end end end) ``` Credits ------- Thanks to John Hawthorn <john@hawthorn.email> of GitHub

Credit: support@hackerone.com support@hackerone.com support@hackerone.com

Affected SoftwareAffected VersionHow to fix
rubygems/actionview>=4.0.0<=4.2.11.0
4.2.11.1
rubygems/actionview>=5.2.0<=5.2.2.0
5.2.2.1
rubygems/actionview>=5.0.0<=5.0.7.1
5.0.7.2
rubygems/actionview>=5.1.0<=5.1.6.1
5.1.6.2
Rubyonrails Rails>=3.0.0<4.2.11.1
Rubyonrails Rails>=5.0.0<5.0.7.2
Rubyonrails Rails>=5.1.0<5.1.6.2
Rubyonrails Rails>=5.2.0<5.2.2.1
Debian Debian Linux=8.0
Redhat Cloudforms=4.7
openSUSE Leap=15.0
Fedoraproject Fedora=30
Redhat Cloudforms=4.6
Redhat Software Collections=1.0
redhat/rubygem-actionview<6.0.0.
6.0.0.
redhat/rubygem-actionview<5.2.2.1
5.2.2.1
redhat/rubygem-actionview<5.1.6.2
5.1.6.2
redhat/rubygem-actionview<5.0.7.2
5.0.7.2
redhat/rubygem-actionview<4.2.11.1
4.2.11.1
>=3.0.0<4.2.11.1
>=5.0.0<5.0.7.2
>=5.1.0<5.1.6.2
>=5.2.0<5.2.2.1
=8.0
=4.7
=15.0
=30
=4.6
=1.0

Remedy

http://www.openwall.com/lists/oss-security/2019/03/22/1

Remedy

https://groups.google.com/forum/#!topic/rubyonrails-security/pFRKI96Sm8Q

Remedy

https://weblog.rubyonrails.org/2019/3/13/Rails-4-2-5-1-5-1-6-2-have-been-released/

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Reference Links

Frequently Asked Questions

  • What is CVE-2019-5418?

    CVE-2019-5418 is a File Content Disclosure vulnerability in Action View.

  • How does CVE-2019-5418 impact systems?

    CVE-2019-5418 can cause arbitrary files on the target server to be rendered, disclosing their content.

  • What is the severity of CVE-2019-5418?

    CVE-2019-5418 has a severity rating of 7.5 (High).

  • Which versions of Action View are affected by CVE-2019-5418?

    Action View versions <5.2.2.1, <5.1.6.2, <5.0.7.2, <4.2.11.1 are affected by CVE-2019-5418.

  • How can I fix CVE-2019-5418?

    To fix CVE-2019-5418, update Action View to versions 5.2.2.1, 5.1.6.2, 5.0.7.2, or 4.2.11.1.

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