Improper Input Validation The advisory has been revoked - it doesn't affect any version of package ruby1.8 (opens in a new tab)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UBUNTU1204-RUBY18-626476
- published10 Sept 2020
- disclosed25 Aug 2015
Introduced: 25 Aug 2015
CVE-2015-4020 (opens in a new tab)Amendment
The Ubuntu security team deemed this advisory irrelevant for Ubuntu:12.04.
NVD Description
Note: Versions mentioned in the description apply only to the upstream ruby1.8 package and not the ruby1.8 package as distributed by Ubuntu.
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
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2015-4020
- http://www.securityfocus.com/bid/75431
- http://blog.rubygems.org/2015/06/08/2.2.5-released.html
- http://blog.rubygems.org/2015/06/08/2.4.8-released.html
- https://github.com/rubygems/rubygems/commit/5c7bfb5
- https://puppet.com/security/cve/CVE-2015-3900
- http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html
- 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/