Ruby: Cross-site Scripting -- Remote with User Interaction

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.3260
                  Multiple jQuery vulnerabilities in RDoc
                              29 August 2019

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        AusCERT Security Bulletin Summary
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Product:           Ruby
Publisher:         Ruby
Operating System:  Windows
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Cross-site Scripting -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2015-9251 CVE-2012-6708 

Reference:         ESB-2019.1299
                   ESB-2018.2225

Original Bulletin: 
   https://www.ruby-lang.org/en/news/2019/08/28/multiple-jquery-vulnerabilities-in-rdoc/

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Multiple jQuery vulnerabilities in RDoc

Posted by aycabta on 28 Aug 2019

There are multiple vulnerabilities about Cross-Site Scripting (XSS) in jQuery
shipped with RDoc which bundled in Ruby. All Ruby users are recommended to
update Ruby to the latest release which includes the fixed version of RDoc.

Details

The following vulnerabilities have been reported.

  o CVE-2012-6708
  o CVE-2015-9251

It is strongly recommended for all Ruby users to upgrade your Ruby installation
or take one of the following workarounds as soon as possible. You also have to
re-generate existing RDoc documentations to completely mitigate the
vulnerabilities.

Affected Versions

  o Ruby 2.3 series: all
  o Ruby 2.4 series: 2.4.6 and earlier
  o Ruby 2.5 series: 2.5.5 and earlier
  o Ruby 2.6 series: 2.6.3 and earlier
  o prior to master commit f308ab2131ee675000926540cbb8c13c91dc3be5

Required actions

RDoc is a static documentation generation tool. Patching the tool itself is
insufficient to mitigate these vulnerabilities.

So, RDoc documentations generated with previous versions have to be
re-generated with newer RDoc.

Workarounds

In principle, you should upgrade your Ruby installation to the latest version.
RDoc 6.1.2 or later includes the fix for the vulnerabilities, so upgrade RDoc
to the latest version if you can  t upgrade Ruby itself.

Note that as mentioned earlier, you have to regenerate existing RDoc
documentations.

gem install rdoc -f

Update: The initial version of this post partially mentioned rdoc-6.1.1.gem,
which was still vulnerable. Please make sure that you install rdoc-6.1.2 or
later.

Regarding the development version, update to the latest HEAD of master branch.

Credits

Thanks to Chris Seaton for reporting the issue.

History

  o Originally published at 2019-08-28 09:00:00 UTC
  o RDoc version fixed at 2019-08-28 11:50:00 UTC
  o Minor language fixes at 2019-08-28 12:30:00 UTC

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