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Category:   Application (VPN)  >   GnuTLS Vendors:   gnutls.org
GnuTLS X.509 Certificate Chain Validation Bug Permits Man-in-the-Middle Attacks
SecurityTracker Alert ID:  1021167
SecurityTracker URL:  http://securitytracker.com/id/1021167
CVE Reference:   CVE-2008-4989   (Links to External Site)
Date:  Nov 11 2008
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:   The vendor has issued a fixed version (2.6.1).

The vendor's advisory is available at:

http://article.gmane.org/gmane.comp.encryption.gpg.gnutls.devel/3215

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

Message History:   This archive entry has one or more follow-up message(s) listed below.
Nov 11 2008 (Red Hat Issues Fix) GnuTLS X.509 Certificate Chain Validation Bug Permits Man-in-the-Middle Attacks
Red Hat has released a fix for Red Hat Enterprise Linux 5.
Jun 11 2009 (Sun Issues Fix) GnuTLS X.509 Certificate Chain Validation Bug Permits Man-in-the-Middle Attacks
Sun has issued a fix for Solaris 10 and OpenSolaris.



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