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Category:   Application (VPN)  >   GnuTLS Vendors:   gnutls.org
GnuTLS NULL Character Flaw in Common Name Field Lets Remote Users Spoof Certficiates
SecurityTracker Alert ID:  1022777
SecurityTracker URL:  http://securitytracker.com/id/1022777
CVE Reference:   CVE-2009-2730   (Links to External Site)
Date:  Aug 26 2009
Impact:   Modification of authentication information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 2.8.2
Description:   A vulnerability was reported in GnuTLS. A remote user can spoof certificates of arbitrary sites.

A remote user can create a certificate with a specially crafted Common Name field or Subject Alternative Name field that contains a NULL character. Once the certificate is signed by a Certificate Authority, the certificate can be used to spoof a target site's certificate.

Dan Kaminsky reported this vulnerability.

Impact:   A remote user can spoof certificates of arbitrary sites.
Solution:   The vendor has issued a fix (2.8.2).

The vendor's advisory is available at:

http://lists.gnu.org/archive/html/help-gnutls/2009-08/msg00011.html

Vendor URL:  www.gnu.org/software/gnutls/security.html (Links to External Site)
Cause:   Input validation error
Underlying OS:   Linux (Any), UNIX (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Aug 26 2009 (Red Hat Issues Fix) GnuTLS NULL Character Flaw in Common Name Field Lets Remote Users Spoof Certficiates   (bugzilla@redhat.com)
Red Hat has released a fix for Red Hat Enterprise Linux 4 and 5.



 Source Message Contents

Date:  Wed, 26 Aug 2009 13:31:36 -0400
Subject:  GnuTLS


GNUTLS-SA-2009-4

CVE-2009-2730
 
 


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