CVE-2015-4020

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.

References

https://www.trustwave.com/Resources/SpiderLabs-Blog/Attacking-Ruby-Gem-Security-with-CVE-2015-3900/

https://www.trustwave.com/Resources/Security-Advisories/Advisories/TWSL2015-009/?fid=6478

https://puppet.com/security/cve/CVE-2015-3900

https://github.com/rubygems/rubygems/commit/5c7bfb5

http://www.securityfocus.com/bid/75431

http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html

http://blog.rubygems.org/2015/06/08/2.4.8-released.html

http://blog.rubygems.org/2015/06/08/2.2.5-released.html

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3