CVE-2015-1855 Information

Description

verify_certificate_identity in the OpenSSL extension in Ruby before 2.0.0 patchlevel 645 2.1.x before 2.1.6 and 2.2.x before 2.2.2 does not properly validate hostnames which allows remote attackers to spoof servers via vectors related to (1) multiple wildcards (1) wildcards in IDNA names (3) case sensitivity and (4) non-ASCII characters.

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Reference

http://www.debian.org/security/2015/dsa-3245 http://www.debian.org/security/2015/dsa-3246 http://www.debian.org/security/2015/dsa-3247 https://bugs.ruby-lang.org/issues/9644 https://puppetlabs.com/security/cve/cve-2015-1855 https://www.ruby-lang.org/en/news/2015/04/13/ruby-openssl-hostname-matching-vulnerability/

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

HIGH

Base Score

NONE

Base Severity

5.9