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             AUSCERT External Security Bulletin Redistribution

                   Multiple vulnerabilities in RubyGems
                               5 March 2019


        AusCERT Security Bulletin Summary

Product:           RubyGems
Publisher:         Ruby
Operating System:  Windows
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Delete Arbitrary Files          -- Existing Account
                   Execute Arbitrary Code/Commands -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-8325 CVE-2019-8324 CVE-2019-8323
                   CVE-2019-8322 CVE-2019-8321 CVE-2019-8320

Original Bulletin: 

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Multiple vulnerabilities in RubyGems

Posted by hsbt on 5 Mar 2019

There are multiple vulnerabilities in RubyGems bundled by Ruby. It is reported
at the official blog of RubyGems .


The following vulnerabilities have been reported.

  o CVE-2019-8320: Delete directory using symlink when decompressing tar
  o CVE-2019-8321: Escape sequence injection vulnerability in verbose
  o CVE-2019-8322: Escape sequence injection vulnerability in gem owner
  o CVE-2019-8323: Escape sequence injection vulnerability in API response
  o CVE-2019-8324: Installing a malicious gem may lead to arbitrary code
  o CVE-2019-8325: Escape sequence injection vulnerability in errors

It is strongly recommended for Ruby users to take one of the following
workarounds as soon as possible.

Affected Versions

  o Ruby 2.4 series: 2.4.5 and earlier
  o Ruby 2.5 series: 2.5.3 and earlier
  o Ruby 2.6 series: 2.6.1 and earlier
  o prior to trunk revision XXXXXX


RubyGems 2.7.6/3.0.3 or later includes the fix for the vulnerabilities, so
upgrade RubyGems to the latest version.

gem update --system

If you can  t upgrade RubyGems, you can apply the following patches as a

  o for Ruby 2.4.5
  o for Ruby 2.5.3
  o for Ruby 2.6.1

About the trunk, update to the latest revision.


This report is based on the official blog of RubyGems .


  o Originally published at 2019-03-05 00:00:00 UTC

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