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                                 CERT-Renater

                      Note d'Information No. 2024/VULN144
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DATE                : 26/03/2024

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running RDoc gem versions prior to
                          6.3.4.1, 6.4.1.1, 6.5.1.1, 6.6.3.1.

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https://www.ruby-lang.org/en/news/2024/03/21/rce-rdoc-cve-2024-27281/
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CVE-2024-27281: RCE vulnerability with .rdoc_options in RDoc

Posted by hsbt on 21 Mar 2024

We have released the RDoc gem version 6.3.4.1, 6.4.1.1, 6.5.1.1
and 6.6.3.1 that have a security fix for a RCE vulnerability. This
vulnerability has been assigned the CVE identifier CVE-2024-27281.


Details

An issue was discovered in RDoc 6.3.3 through 6.6.2, as distributed
in Ruby 3.x through 3.3.0.

When parsing .rdoc_options (used for configuration in RDoc) as a YAML
file, object injection and resultant remote code execution are
possible because there are no restrictions on the classes that can be
restored.

When loading the documentation cache, object injection and resultant
remote code execution are also possible if there were a crafted cache.


Recommended action

We recommend to update the RDoc gem to version 6.6.3.1 or later. In
order to ensure compatibility with bundled version in older Ruby
series, you may update as follows instead:

     For Ruby 3.0 users: Update to rdoc 6.3.4.1
     For Ruby 3.1 users: Update to rdoc 6.4.1.1
     For Ruby 3.2 users: Update to rdoc 6.5.1.1

You can use gem update rdoc to update it. If you are using bundler,
please add gem "rdoc", ">= 6.6.3.1" to your Gemfile.

Note: 6.3.4, 6.4.1, 6.5.1 and 6.6.3 have a incorrect fix. We
recommend to upgrade 6.3.4.1, 6.4.1.1, 6.5.1.1 and 6.6.3.1 instead
of them.


Affected versions

     Ruby 3.0.6 or lower
     Ruby 3.1.4 or lower
     Ruby 3.2.3 or lower
     Ruby 3.3.0
     RDoc gem 6.3.3 or lower, 6.4.0 through 6.6.2 without the patch
        versions (6.3.4, 6.4.1, 6.5.1)


Credits

Thanks to ooooooo_q for discovering this issue.


History

     Originally published at 2024-03-21 4:00:00 (UTC)


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