Provide references for CVE-2015-4020.
Where can I find more information about CVE-2015-4020?
References are available at: http://blog.rubygems.org/2015/06/08/2.2.5-released.html, https://www.trustwave.com/Resources/SpiderLabs-Blog/Attacking-Ruby-Gem-Security-with-CVE-2015-3900/, http://www.securityfocus.com/bid/75431, https://www.trustwave.com/Resources/Security-Advisories/Advisories/TWSL2015-009/?fid=6478, http://blog.rubygems.org/2015/06/08/2.4.8-released.html, https://github.com/rubygems/rubygems/commit/5c7bfb5, https://puppet.com/security/cve/CVE-2015-3900, http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html.