Risk | Medium |
Patch available | YES |
Number of vulnerabilities | 1 |
CVE-ID | CVE-2015-4020 |
CWE-ID | CWE-20 |
Exploitation vector | Network |
Public exploit | N/A |
Vulnerable software Subscribe |
Ruby Universal components / Libraries / Scripting languages |
Vendor | Ruby |
Security Bulletin
This security bulletin contains one medium risk vulnerability.
EUVDB-ID: #VU32366
Risk: Medium
CVSSv3.1: 4.6 [CVSS:3.1/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2015-4020
CWE-ID:
CWE-20 - Improper input validation
Exploit availability: No
DescriptionThe vulnerability allows a remote non-authenticated attacker to manipulate data.
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.
MitigationInstall update from vendor's website.
Vulnerable software versionsRuby: 2.0.0 - 2.4.7
External linkshttp://blog.rubygems.org/2015/06/08/2.2.5-released.html
http://blog.rubygems.org/2015/06/08/2.4.8-released.html
http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html
http://www.securityfocus.com/bid/75431
http://github.com/rubygems/rubygems/commit/5c7bfb5
http://puppet.com/security/cve/CVE-2015-3900
http://www.trustwave.com/Resources/Security-Advisories/Advisories/TWSL2015-009/?fid=6478
http://www.trustwave.com/Resources/SpiderLabs-Blog/Attacking-Ruby-Gem-Security-with-CVE-2015-3900/
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.