GHSA-vx9j-46rh-fqr8

Dashboard / Vulnerabilities / GHSA-vx9j-46rh-fqr8

GHSA-vx9j-46rh-fqr8

Summary: actionview contains Path Traversal vulnerability

Details: 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!

References: https://nvd.nist.gov/vuln/detail/CVE-2016-2097, https://github.com/rails/rails/commit/8a1d3ea617ffb0c8ae8467fa439bf63a3bfc4324, https://github.com/rails/rails, https://github.com/rubysec/ruby-advisory-db/blob/master/gems/actionpack/CVE-2016-2097.yml, https://github.com/rubysec/ruby-advisory-db/blob/master/gems/actionview/CVE-2016-2097.yml, https://groups.google.com/forum/#!topic/rubyonrails-security/ddY6HgqB2z4, https://web.archive.org/web/20160322002234/http://www.securitytracker.com/id/1035122, https://web.archive.org/web/20200228015320/http://www.securityfocus.com/bid/83726, https://web.archive.org/web/20201221115217/https://groups.google.com/forum/message/raw?msg=rubyonrails-security/ddY6HgqB2z4/we0RasMZIAAJ, http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00080.html, http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00083.html, http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00006.html, http://weblog.rubyonrails.org/2016/2/29/Rails-4-2-5-2-4-1-14-2-3-2-22-2-have-been-released, http://www.debian.org/security/2016/dsa-3509