eEye Digital Security eEye Digital Security
  • Login to the eEye Business Client Portal
  • Shop for eEye Products
  • Read the eEye Blog
  • Subscribe to eEye RSS Feeds
  • Follow eEye on Twitter
  • Follow eEye of Facebook

Research > Zero-Day Tracker > 20110902

Apple Mac OS X Keychain Certificate Security Bypass

Date Disclosed:

Date Patched:


Affected Software:
Apple OS X 10.6.8 and prior

OS X does not properly handle the Extended Validation certificate attribute of Certificate Authority certificates. Within the Keychain, if a user has marked an Extended Validation certificate as not to be trusted, OS X will still trust it.


Code Execution:

Certificate Spoofing
This vulnerability allows an attacker to spoof an Extended Validation certificate, for use within a man-in-the-middle attack. This would permit attackers to monitor and/or modify traffic that is normally encrypted.

No mitigation has been provided.



9.2.2011 - Public Information Released
9.9.2011 - Apple releases Security Update 2011-005 for Snow Leopard and Lion

Copyright ©1998-2011 eEye Digital Security
Permission is hereby granted for the redistribution of this alert electronically. It is not to be edited in any way without express consent of eEye. If you wish to reprint the whole or any part of this alert in any other medium excluding electronic medium, please email for permission.

The information within this paper may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are no warranties, implied or express, with regard to this information. In no event shall the author be liable for any direct or indirect damages whatsoever arising out of or in connection with the use or spread of this information. Any use of this information is at the user's own risk.

Next Steps

Free Trial
Test drive an eEye product
On-demand Demo
See an online product tour
One-on-one Demo
Schedule a personalized tour
Compare Products
See side-by-side features
Buy Now
Go to eEye product store
Contact | Site Map | Privacy | Website Feedback | 1.866.339.3732
© 1998 – 2012 eEye Digital Security. All rights reserved.