CVE-2015-4020 Information

Description

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.

Reference

http://blog.rubygems.org/2015/06/08/2.2.5-released.html http://blog.rubygems.org/2015/06/08/2.4.8-released.html http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html http://www.securityfocus.com/bid/75431 https://github.com/rubygems/rubygems/commit/5c7bfb5 https://puppet.com/security/cve/CVE-2015-3900 https://www.trustwave.com/Resources/Security-Advisories/Advisories/TWSL2015-009/?fid=6478 https://www.trustwave.com/Resources/SpiderLabs-Blog/Attacking-Ruby-Gem-Security-with-CVE-2015-3900/