CVE-2015-4020

medium

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

Advisories
More

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

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

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

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

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

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

Published: 2015-08-25

Updated: 2025-04-12

Risk Information

CVSS v2

Base Score: 4.3

Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:N

Severity: Medium

CVSS v3

Base Score: 4.3

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Severity: Medium

EPSS

EPSS: 0.00542