MitreCVELIST:CVE-2015-4020CVE-2015-4020
RubyGems 2.0.x before 2.0.17, 2.2.x before 2.2.5, and 2.4.x before 2.4.8 does not validate the hostname when fetching gems or making API requests, which allows remote attackers to redirect requests to arbitrary domains via a crafted DNS SRV record with a domain that is suffixed with the original domain name, aka a “DNS hijack attack.” NOTE: this vulnerability exists because to an incomplete fix for CVE-2015-3900.
References
blog.rubygems.org/2015/06/08/2.2.5-released.html
blog.rubygems.org/2015/06/08/2.4.8-released.html
www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html
www.securityfocus.com/bid/75431
github.com/rubygems/rubygems/commit/5c7bfb5
puppet.com/security/cve/CVE-2015-3900
www.trustwave.com/Resources/Security-Advisories/Advisories/TWSL2015-009/?fid=6478
www.trustwave.com/Resources/SpiderLabs-Blog/Attacking-Ruby-Gem-Security-with-CVE-2015-3900/
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