RubyGems remote_fetcher.rb api_endpoint() Function Missing SRV Record Hostname Validation Request Hijacking

RubyGems contains a flaw in the apiendpoint function in remotefetcher.rb that is triggered when handling hostnames in SRV records. With a specially crafted response, a context-dependent attacker may conduct DNS hijacking attacks. This vulnerability is due to an incomplete fix for CVE-2015-3900,...