Bug 909029 (CVE-2013-0269) - CVE-2013-0269 rubygem-json: Denial of Service and SQL Injection
Summary: CVE-2013-0269 rubygem-json: Denial of Service and SQL Injection
Alias: CVE-2013-0269
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Whiteboard: impact=moderate,public=20130211,repor...
Keywords: Security
Depends On: 910315 909031 909033 909035 909036 910313 910314 974094 978171 995670
Blocks: 910299 925673 958335 978151 980652 981152
TreeView+ depends on / blocked
Reported: 2013-02-08 05:19 UTC by Kurt Seifried
Modified: 2019-06-08 19:25 UTC (History)
51 users (show)

Clone Of:
Last Closed: 2013-09-03 04:56:26 UTC

Attachments (Terms of Use)
rubygem-json-1-5-CVE-2013-0269.patch (14.96 KB, patch)
2013-02-08 05:20 UTC, Kurt Seifried
no flags Details | Diff
rubygem-json-1-6-CVE-2013-0269.patch (21.19 KB, patch)
2013-02-08 05:20 UTC, Kurt Seifried
no flags Details | Diff
rubygem-json-1-7-CVE-2013-0269.patch (17.44 KB, patch)
2013-02-08 05:21 UTC, Kurt Seifried
no flags Details | Diff
Updated patch for 1.7 version (34.86 KB, patch)
2013-02-12 10:16 UTC, Jan Lieskovsky
no flags Details | Diff

External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2013:0686 normal SHIPPED_LIVE Moderate: Subscription Asset Manager 1.2.1 update 2013-03-26 23:16:44 UTC
Red Hat Product Errata RHSA-2013:0701 normal SHIPPED_LIVE Moderate: ruby193-ruby, rubygem-json and rubygem-rdoc security update 2013-04-03 00:06:00 UTC
Red Hat Product Errata RHSA-2013:1028 normal SHIPPED_LIVE Important: Fuse ESB Enterprise 7.1.0 update 2013-07-09 21:36:00 UTC
Red Hat Product Errata RHSA-2013:1147 normal SHIPPED_LIVE Moderate: Red Hat JBoss SOA Platform 5.3.1 update 2013-08-08 21:07:08 UTC
Red Hat Product Errata RHSA-2013:1185 normal SHIPPED_LIVE Important: Red Hat JBoss Fuse 6.0.0 patch 2 2013-08-30 03:27:44 UTC

Description Kurt Seifried 2013-02-08 05:19:00 UTC
Aaron Patterson of Ruby on Rails project reports:

Denial of Service and Unsafe Object Creation Vulnerability in JSON

There is a denial of service and unsafe object creation vulnerability in the 
json gem. This vulnerability has been assigned the CVE identifier 

Versions Affected:  All. This includes JSON that ships with Ruby 1.9.X-pXXX
Not affected:       NONE
Fixed Versions:     1.7.7, 1.6.8, 1.5.5

When parsing certain JSON documents, the JSON gem can be coerced in to 
creating Ruby symbols in a target system.  Since Ruby symbols are not garbage 
collected, this can result in a denial of service attack.

The same technique can be used to create objects in a target system that act 
like internal objects.  These "act alike" objects can be used to bypass 
certain security mechanisms and can be used as a spring board for SQL injection
attacks in Ruby on Rails.

Impacted code looks like this:


Where the `user_input` variable will have a JSON document like this:


The JSON gem will attempt to look up the constant "foo".  Looking up this 
constant will create a symbol.

In JSON version 1.7.x, objects with arbitrary attributes can be created using 
JSON documents like this:


This document will result in an instance of JSON::GenericObject, with the 
attribute "foo" that has the value "bar".  Instantiating these objects will 
result in arbitrary symbol creation and in some cases can be used to bypass 
security measures.

PLEASE NOTE: this behavior *does not change* when using `JSON.load`.  
`JSON.load` should *never* be given input from unknown sources.  If you are 
processing JSON from an unknown source, *always* use `JSON.parse`.

All users running an affected release should either upgrade or use one of the 
work arounds immediately. 

The FIXED releases are available at the normal locations.

For users that cannot upgrade, please use the attached patches.  If you cannot 
use the attached patches, change your code from this:


To this:

    JSON.parse(json, :create_additions => false)

If you cannot change the usage of `JSON.parse` (for example you're using a gem 
which depends on `JSON.parse` like multi_json), then apply this monkey patch:

    module JSON
      class << self
        alias :old_parse :parse
        def parse(json, args = {})
          args[:create_additions] = false
          old_parse(json, args)

To aid users who aren't able to upgrade immediately we have provided patches 
for the three supported release series.  They are in git-am format and consist 
of a single changeset. 

* 1-7-VULN.patch - Patch for the 1.7 series
* 1-6-VULN.patch - Patch for the 1.6 series
* 1-5-VULN.patch - Patch for the 1.5 series

* Thomas Hollstegge of Zweitag (www.zweitag.de)
* Ben Murphy

Comment 1 Kurt Seifried 2013-02-08 05:20:35 UTC
Created attachment 694933 [details]

Comment 2 Kurt Seifried 2013-02-08 05:20:56 UTC
Created attachment 694934 [details]

Comment 3 Kurt Seifried 2013-02-08 05:21:16 UTC
Created attachment 694936 [details]

Comment 12 Tomas Hoger 2013-02-12 10:03:28 UTC
Created ruby tracking bugs for this issue

Affects: fedora-all [bug 910314]

Comment 13 Tomas Hoger 2013-02-12 10:03:33 UTC
Created rubygem-json tracking bugs for this issue

Affects: fedora-all [bug 910313]
Affects: epel-all [bug 910315]

Comment 14 Jan Lieskovsky 2013-02-12 10:16:30 UTC
Created attachment 696457 [details]
Updated patch for 1.7 version

Updated patch for 1.7 version from:
  [1] http://www.openwall.com/lists/oss-security/2013/02/11/8

From [1]:

I've attached an updated patch for the JSON gem.  This patch is for the
1.7.x series.  The difference in this patch is changing the version

Aaron Patterson

Comment 18 Vincent Danen 2013-02-22 15:27:33 UTC
External References:


Comment 19 errata-xmlrpc 2013-03-26 19:17:59 UTC
This issue has been addressed in following products:

  Red Hat Subscription Asset Manager 1.2

Via RHSA-2013:0686 https://rhn.redhat.com/errata/RHSA-2013-0686.html

Comment 20 Murray McAllister 2013-03-27 10:13:16 UTC

Red Hat would like to thank Ruby on Rails upstream for reporting this issue. Upstream acknowledges Thomas Hollstegge of Zweitag and Ben Murphy as the original reporters.

Comment 22 errata-xmlrpc 2013-04-02 20:07:10 UTC
This issue has been addressed in following products:

  RHEL 6 Version of OpenShift Enterprise

Via RHSA-2013:0701 https://rhn.redhat.com/errata/RHSA-2013-0701.html

Comment 27 errata-xmlrpc 2013-07-09 17:37:14 UTC
This issue has been addressed in following products:

  Fuse ESB Enterprise 7.1.0

Via RHSA-2013:1028 https://rhn.redhat.com/errata/RHSA-2013-1028.html

Comment 28 Kurt Seifried 2013-07-26 06:21:42 UTC
The Red Hat Security Response Team has rated this issue as having moderate security impact in CloudForms 1.1. This issue is not currently planned to be addressed in future updates.

Comment 29 errata-xmlrpc 2013-08-08 17:08:54 UTC
This issue has been addressed in following products:

  Red Hat JBoss SOA Platform 5.3.1

Via RHSA-2013:1147 https://rhn.redhat.com/errata/RHSA-2013-1147.html

Comment 31 errata-xmlrpc 2013-08-29 23:28:40 UTC
This issue has been addressed in following products:

  Red Hat JBoss Fuse 6.0.0

Via RHSA-2013:1185 https://rhn.redhat.com/errata/RHSA-2013-1185.html

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