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Category:   Application (VPN)  >   OpenSSL Vendors:   OpenSSL.org
(Apple Issues Fix for OS X) OpenSSL SSL 3.0 Protocol Downgrade Flaw Lets Remote Users Decrypt SSL Traffic
SecurityTracker Alert ID:  1031062
SecurityTracker URL:  http://securitytracker.com/id/1031062
CVE Reference:   CVE-2014-3566   (Links to External Site)
Updated:  Oct 17 2014
Original Entry Date:  Oct 17 2014
Impact:   Disclosure of system information, Disclosure of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  

Description:   A vulnerability was reported in OpenSSL. A remote user can decrypt SSL sessions in certain cases.

A remote user can with the ability to conduct a man-in-the-middle attack can force a client to negotiate a downgrade to SSLv3 instead of a TLS v1.x protocol and then conduct a BEAST-style of attack to decrypt portions of the session.

This protocol vulnerability is referred to as the POODLE ("Padding Oracle On Downgraded Legacy Encryption") vulnerability.

This is a flaw in the protocol rather than in the OpenSSL implementation.

The original advisory is available at:

https://www.openssl.org/~bodo/ssl-poodle.pdf

Bodo Moller, Thai Duong, and Krzysztof Kotowicz reported this vulnerability.

Impact:   A remote user with the ability to conduct a man-in-the-middle attack can decrypt SSL sessions.
Solution:   Apple has issued a fix (Security Update 2014-005 for 10.8.5 and 10.9.5; OS X Yosemite 10.10; OS X Server v2.2.5; OS X Server v3.2.2; OS X Server v4.0).

The fix disables CBC cipher suites when TLS connection attempts fail.

The Apple advisories are available at:

https://support.apple.com/kb/HT6527
https://support.apple.com/kb/HT6529
https://support.apple.com/kb/HT6531
https://support.apple.com/kb/HT6535
https://support.apple.com/kb/HT6536

Vendor URL:  www.openssl.org/ (Links to External Site)
Cause:   Access control error
Underlying OS:  UNIX (macOS/OS X)
Underlying OS Comments:  10.8.5, 10.9.5

Message History:   This archive entry is a follow-up to the message listed below.
Oct 15 2014 OpenSSL SSL 3.0 Protocol Downgrade Flaw Lets Remote Users Decrypt SSL Traffic



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