UPDATE Ruby JSON: Access Confidential Data -- Existing Account

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             AUSCERT External Security Bulletin Redistribution

                              ESB-2017.2345.2
      CVE-2017-14064: Heap exposure vulnerability in generating JSON
                             18 September 2017

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Ruby JSON
Publisher:         Ruby
Operating System:  Windows
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Access Confidential Data -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-14064  

Reference:         ESB-2017.2224

Original Bulletin: 
   https://www.ruby-lang.org/en/news/2017/09/14/json-heap-exposure-cve-2017-14064/

Revision History:  September 18 2017: Corrected product name.
                   September 15 2017: Initial Release

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CVE-2017-14064: Heap exposure vulnerability in generating JSON

Posted by usa on 14 Sep 2017

There is a heap exposure vulnerability in JSON bundled by Ruby. This 
vulnerability has been assgined the CVE identifier CVE-2017-14064.

Details

The generate method of JSON module optionally accepts an instance of 
JSON::Ext::Generator::State class. If a malcious instance is passed, the 
result may include contents of heap.

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

Affected Versions

Ruby 2.2 series: 2.2.7 and earlier

Ruby 2.3 series: 2.3.4 and earlier

Ruby 2.4 series: 2.4.1 and earlier

prior to trunk revision 58323

Workaround

The JSON library is also distributed as a gem. If you cant upgrade Ruby 
itself, install JSON gem newer than version 2.0.4.

Credit

Thanks to ahmadsherif for reporting this issue.

History

Originally published at 2017-09-14 12:00:00 (UTC)

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