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Category:   Application (Generic)  >   Ruby Vendors:   Matsumoto, Yukihiro
(Ubuntu Issues Fix) Ruby OpenSSL Hostname Processing Error Lets Remote Users Bypass Certificate Verification
SecurityTracker Alert ID:  1038993
SecurityTracker URL:  http://securitytracker.com/id/1038993
CVE Reference:   CVE-2015-1855   (Links to External Site)
Date:  Jul 25 2017
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:   Ubuntu has issued a fix.

The Ubuntu advisory is available at:

tps://www.ubuntu.com/usn/usn-3365-1

Vendor URL:  www.ubuntu.com/usn/usn-3365-1 (Links to External Site)
Cause:   Authentication error
Underlying OS:  Linux (Ubuntu)
Underlying OS Comments:  14.04 LTS, 16.04 LTS, 17.04

Message History:   This archive entry is a follow-up to the message listed below.
May 4 2015 Ruby OpenSSL Hostname Processing Error Lets Remote Users Bypass Certificate Verification



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