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Message-ID: <53F24A1E.4080409@redhat.com>
Date: Mon, 18 Aug 2014 12:46:54 -0600
From: Kurt Seifried <kseifried@...hat.com>
To: oss-security@...ts.openwall.com, rubyonrails-security@...glegroups.com,
ruby-security-ann@...glegroups.com
Subject: Re: [Ruby on Rails] [CVE-2014-3514] Strong Parameter
bypass with create_with
Can you provide a URL or a copy of the patches? Thanks.
On 18/08/14 11:11 AM, Rafael Mendonça França 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
>
--
Kurt Seifried -- Red Hat -- Product Security -- Cloud
PGP A90B F995 7350 148F 66BF 7554 160D 4553 5E26 7993
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