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Category:   OS (Microsoft)  >   Windows DLL (Any) Vendors:   Microsoft
Windows NetLogon Bug Lets Local Users Gain Elevated Privileges and Kerberos Bug Lets Remote Users Bypass Authentication in Certain Cases
SecurityTracker Alert ID:  1036576
SecurityTracker URL:  http://securitytracker.com/id/1036576
CVE Reference:   CVE-2016-3237, CVE-2016-3300   (Links to External Site)
Date:  Aug 9 2016
Impact:   Root access via local system, User access via local system, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): Vista SP2, 2008 SP2, 7 SP1, 2008 R2 SP1, 8.1, 2012, 2012 R2, RT 8.1, 10, 10 Version 1511, 10 Version 1607; and prior service packs
Description:   Two vulnerabilities were reported in Microsoft Windows Kerberos and NetLogon authentication methods. A local user can obtain elevated privileges on the target system. A remote user can bypass authentication in certain cases.

A local user on a domain-joined system can run a specially crafted application to trigger a flaw in Windows NetLogon to gain elevated privileges [CVE-2016-3300]. Domain-joined systems with a domain controller running on Windows Server 2012 or 2012 R2 are affected.

The Kerberos implementation does not properly handle a password change request, falling back to use the NT LAN Manager (NTLM) Authentication Protocol [CVE-2016-3237]. A remote user that can conduct a man-in-the-middle attack between a domain controller and the target system can bypass authentication on the target system.

Nabeel Ahmed of Dimension Data reported the Kerberos vulnerability.

Impact:   A local user can obtain elevated privileges on the target system.

A remote user that can conduct a man-in-the-middle attack can bypass authentication on the target system.

Solution:   The vendor has issued a fix.

The Microsoft advisory is available at:

https://technet.microsoft.com/library/security/ms16-101

Vendor URL:  technet.microsoft.com/library/security/ms16-101 (Links to External Site)
Cause:   Access control error, State error

Message History:   None.


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