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Category:   Application (Generic)  >   Ruby Vendors:   Matsumoto, Yukihiro
Ruby OpenSSL Hostname Processing Error Lets Remote Users Bypass Certificate Verification
SecurityTracker Alert ID:  1032239
SecurityTracker URL:  http://securitytracker.com/id/1032239
CVE Reference:   CVE-2015-1855   (Links to External Site)
Date:  May 4 2015
Impact:   User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 2.0.x, 2.1.x, 2.2.x
Description:   A vulnerability was reported in Ruby. A remote user can bypass certificate verification on the target system.

The system's OpenSSL extension does not properly implement RFC 6125 and RFC 5280 for hostname matching. As a result, a remote user with the ability to conduct a man-in-the-middle attack can supply a certificate with a specially crafted hostname value that will bypass certificate verification on the target system.

Tony Arcieri, Jeffrey Walton, and Steffan Ullrich reported this vulnerability.

Impact:   A remote user with the ability to conduct a man-in-the-middle attack can bypass certificate verification on the target system.
Solution:   The vendor has issued a fix (2.0.0 patchlevel 645, 2.1.6, 2.2.2).

The vendor's advisory is available at:

https://www.ruby-lang.org/en/news/2015/04/13/ruby-openssl-hostname-matching-vulnerability/

Vendor URL:  www.ruby-lang.org/en/news/2015/04/13/ruby-openssl-hostname-matching-vulnerability/ (Links to External Site)
Cause:   Authentication error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Oct 1 2015 (Apple Issues Fix for Apple OS X) Ruby OpenSSL Hostname Processing Error Lets Remote Users Bypass Certificate Verification
Apple has issued a fix for Apple OS X.
Jul 25 2017 (Ubuntu Issues Fix) Ruby OpenSSL Hostname Processing Error Lets Remote Users Bypass Certificate Verification
Ubuntu has issued a fix for Ubuntu Linux 14.04 LTS, 16.04 LTS, and 17.04.



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