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Category:   Application (Generic)  >   Ruby Vendors:   Matsumoto, Yukihiro
Ruby Certificate Hostname Validation Flaw Lets Remote Users Spoof SSL Servers
SecurityTracker Alert ID:  1028714
SecurityTracker URL:  http://securitytracker.com/id/1028714
CVE Reference:   CVE-2013-4073   (Links to External Site)
Date:  Jun 27 2013
Impact:   Disclosure of system information, Disclosure of user information, Modification of system information, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to versions 1.8.7-p374, 1.9.3-p448, 2.0.0-p247
Description:   A vulnerability was reported in Ruby. A remote user can spoof SSL servers.

The SSL client implements hostname identity check does not properly handle hostnames in the certificate subjectAltName X509 extension that contain null bytes. A remote user can exploit this to conduct man-in-the-middle attacks.

The vulnerability resides in OpenSSL::SSL.verify_certificate_identity().

William (B.J.) Snow Orvis reported this vulnerability.

Impact:   A remote user can spoof SSL servers in certain cases.
Solution:   The vendor has issued a fix (1.8.7-p374, 1.9.3-p448, 2.0.0-p247).

The vendor's advisory is available at:

http://www.ruby-lang.org/en/news/2013/06/27/hostname-check-bypassing-vulnerability-in-openssl-client-cve-2013-4073/

Vendor URL:  www.ruby-lang.org/en/news/2013/06/27/hostname-check-bypassing-vulnerability-in-openssl-client-cve-2013-4073/ (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.
Jul 17 2013 (Red Hat Issues Fix) Ruby Certificate Hostname Validation Flaw Lets Remote Users Spoof SSL Servers
Red Hat has issued a fix for Red Hat Enterprise Linux 5 and 6.
Aug 6 2013 (Red Hat Issues Fix) Ruby Certificate Hostname Validation Flaw Lets Remote Users Spoof SSL Servers
Red Hat has issued a fix for Red Hat OpenShift Enterprise.



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