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
| Affected Software | Affected Version | How 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 |
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Reference Links
- https://nvd.nist.gov/vuln/detail/CVE-2019-5418
- https://access.redhat.com/errata/RHSA-2019:0796
- https://access.redhat.com/errata/RHSA-2019:1147
- https://access.redhat.com/errata/RHSA-2019:1149
- https://access.redhat.com/errata/RHSA-2019:1289
- https://github.com/advisories/GHSA-86g5-2wh3-gc9j (Advisory)
- https://groups.google.com/forum/#!topic/rubyonrails-security/pFRKI96Sm8Q
- https://groups.google.com/forum/#!topic/rubyonrails-security/zRNVOUhKHrg
- https://lists.debian.org/debian-lts-announce/2019/03/msg00042.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/Y43636TH4D6T46IC6N2RQVJTRFJAAYGA/
- https://weblog.rubyonrails.org/2019/3/13/Rails-4-2-5-1-5-1-6-2-have-been-released/
- https://www.exploit-db.com/exploits/46585/
- http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00011.html
- http://packetstormsecurity.com/files/152178/Rails-5.2.1-Arbitrary-File-Content-Disclosure.html
- http://www.openwall.com/lists/oss-security/2019/03/22/1
- https://groups.google.com/forum/#!msg/rubyonrails-security/pFRKI96Sm8Q/IhpRq9D2CgAJ
- https://github.com/mpgn/CVE-2019-5418
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1689161
- https://seclists.org/oss-sec/2019/q1/178
- https://access.redhat.com/security/cve/CVE-2019-5419
- https://github.com/rails/rails/commit/58ed245e80a8710fbe31e91417bfd19f9f934cc4
- https://github.com/rails/rails/commit/c79dcbce9bfd20fe7f72ca431c49965ee39bd645
- https://github.com/rails/rails/commit/92c025d7f17ff256ac50f5e3bc014bb1a016d1ec
- https://github.com/rails/rails/commit/d7fac9c09a535ec7f11bb9aa8addb4af37b7d4b5
- https://bugzilla.redhat.com/show_bug.cgi?id=1689159
- https://groups.google.com/forum/#%21topic/rubyonrails-security/pFRKI96Sm8Q
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y43636TH4D6T46IC6N2RQVJTRFJAAYGA/
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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