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Category:   OS (Microsoft)  >   Windows Schannel Vendors:   Microsoft
Windows Schannel Weak Diffie-Hellman Ephemeral Key Length Lets Remote Users Decrypt TLS Sessions
SecurityTracker Alert ID:  1032283
SecurityTracker URL:  http://securitytracker.com/id/1032283
CVE Reference:   CVE-2015-1716   (Links to External Site)
Date:  May 12 2015
Impact:   Disclosure of system information, Disclosure of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 2003 SP2, Vista SP2, 2008 SP2, 7 SP1, 2008 R2 SP1, 8, 8.1, 2012, 2012 R2, RT, RT 8.1; and prior service packs
Description:   A vulnerability was reported in Windows Schannel. A remote user can obtain potentially sensitive information on the target system.

A remote user with the ability to monitor network communications can potentially decrypt weak keys when Schannel allows a weak Diffie-Hellman ephemeral (DFE) key length of 512 bits in an encrypted TLS session.

Impact:   A remote user can decrypt TLS connections to obtain potentially sensitive information.
Solution:   The vendor has issued a fix.

A patch matrix is available in the vendor's advisory.

The Microsoft advisory is available at:

https://technet.microsoft.com/library/security/ms15-055

Vendor URL:  technet.microsoft.com/library/security/ms15-055 (Links to External Site)
Cause:   Authentication error

Message History:   None.


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