Date: Mon, 18 Aug 2014 15:52:17 -0300 From: Rafael Mendonça França <rafaelmfranca@...il.com> To: rubyonrails-security@...glegroups.com, oss-security@...ts.openwall.com, ruby-security-ann@...glegroups.com Subject: Re: [Ruby on Rails] [CVE-2014-3514] Strong Parameter bypass with create_with These are the attached patches. Rafael Mendonça França http://twitter.com/rafaelfranca https://github.com/rafaelfranca On Mon, Aug 18, 2014 at 2:11 PM, Rafael Mendonça França < rafaelmfranca@...il.com> wrote: > There is a vulnerability in the create_with method in Active Record. This > vulnerability has been assigned the CVE identifier CVE-2014-3514. > > Versions Affected: 4.0.0 and All Later Versions. > Not affected: Versions earlier than 4.0.0 > Fixed Versions: 4.0.9 4.1.5 > > Impact > ------ > The create_with functionality in Active Record was implemented incorrectly > and completely bypasses the strong parameters protection. Applications > which pass user-controlled values to create_with could allow attackers to > set arbitrary attributes on models. > > All users running an affected release should either upgrade or use one of > the workarounds immediately. > > Releases > -------- > The 4.0.9 and 4.1.5 releases are available at the normal locations. > > Workarounds > ----------- > To avoid this vulnerability you will have to either remove all calls to > create_with, or carefully audit your codebase to ensure it sanitizes the > input first. For example you should replace code like this: > > user.blog_posts.create_with(params[:blog_post]).create > > with either: > > user.blog_posts.create(params[:blog_post]) > > or: > > user.blog_posts.create_with(params[:blog_post].permit(:title, :body, > :etc)).create > > > Patches > ------- > To aid users who aren't able to upgrade immediately we have provided > patches for the two supported release series. They are in git-am format > and consist of a single changeset. > > * 4-1-create_with.patch - Patch for 4.1 series > * 4-0-create_with.patch - Patch for 4.0 series > > Please note that only the 4.0.x and 4.1.x series receive regular security > updates 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 earlier releases. > > Credits > ------- > > Thanks to Stephen Touset of Square for reporting the vulnerability to us, > and to Jeff Jarmoc of Matasano and Charlie Somerville of GitHub for helping > verify the patches and advisories. > > Rafael Mendonça França > http://twitter.com/rafaelfranca > https://github.com/rafaelfranca > Content of type "text/html" skipped Download attachment "4-0-create_with.patch" of type "application/octet-stream" (4128 bytes) Download attachment "4-1-create_with.patch" of type "application/octet-stream" (4136 bytes)
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