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Category:   OS (Microsoft)  >   Windows Kernel Vendors:   Microsoft
Microsoft Windows SSL 3.0 Protocol Downgrade Flaw Lets Remote Users Decrypt SSL Traffic
SecurityTracker Alert ID:  1031039
SecurityTracker URL:  http://securitytracker.com/id/1031039
CVE Reference:   CVE-2014-3566   (Links to External Site)
Updated:  Feb 10 2015
Original Entry Date:  Oct 15 2014
Impact:   Disclosure of system information, Disclosure of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 2003 SP2, Vista SP2, 2008 SP2, 7 SP1, 2008 R2 SP1, 8, 8.1, 2012, 2012 R2; and prior service packs
Description:   A vulnerability was reported in Microsoft Windows. 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 Microsoft SSL 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:   The vendor recommends disabling SSL 3.0 as described in their advisory.

A Microsoft Fix it Solution for Internet Explorer is available at:

https://support.microsoft.com/kb/3009008

[Editor's note: As of February 10, 2015, SSL 3.0 fallback attempts are disabled by default in Internet Explorer 11.]

The vendor's advisory is available at:

https://technet.microsoft.com/library/security/3009008

Vendor URL:  technet.microsoft.com/library/security/3009008 (Links to External Site)
Cause:   Access control error

Message History:   None.


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