CVE-2015-4020
4.3 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:N/C:N/I:P/A:N
8.1 High
AI Score
Confidence
High
0.008 Low
EPSS
Percentile
82.2%
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.
Affected configurations
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/
Related
4.3 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:N/C:N/I:P/A:N
8.1 High
AI Score
Confidence
High
0.008 Low
EPSS
Percentile
82.2%