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Category:   Application (VPN)  >   GnuTLS Vendors:   gnutls.org
(Sun Issues Fix) GnuTLS X.509 Certificate Chain Validation Bug Permits Man-in-the-Middle Attacks
SecurityTracker Alert ID:  1022372
SecurityTracker URL:  http://securitytracker.com/id/1022372
CVE Reference:   CVE-2008-4989   (Links to External Site)
Date:  Jun 11 2009
Impact:   Modification of system information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 2.6.1
Description:   A vulnerability was reported in GnuTLS. A remote user that can conduct a man-in-the-middle attack can spoof valid certificates.

The libgnutls component does not properly validate X.509 certificate chains. A remote user with the ability to conduct a man-in-the-middle attack can cause GNU TLS clients to trust arbitrary sites.

The vulnerability resides in 'lib/x509/verify.c'.

Martin von Gagern reported this vulnerability.

Impact:   A remote user that can conduct a man-in-the-middle attack can spoof certificates for arbitrary sites.
Solution:   Sun has issued a fix.

SPARC Platform

* Solaris 10 with patch 123938-02 or later
* OpenSolaris based upon builds snv_111a or later

x86 Platform

* Solaris 10 with patch 123939-02 or later
* OpenSolaris based upon builds snv_111a or later

The Sun advisory is available at:

http://sunsolve.sun.com/search/document.do?assetkey=1-66-260528-1

Vendor URL:  www.gnu.org/software/gnutls/security.html (Links to External Site)
Cause:   Authentication error
Underlying OS:  UNIX (Solaris - SunOS)
Underlying OS Comments:  10, OpenSolaris

Message History:   This archive entry is a follow-up to the message listed below.
Nov 11 2008 GnuTLS X.509 Certificate Chain Validation Bug Permits Man-in-the-Middle Attacks



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