Escalation of privileges in Kerberos and NetLogon implementation in Microsoft Windows

Published: 2016-08-10 13:55:03
Severity Medium
Patch available YES
Number of vulnerabilities 2
CVE ID CVE-2016-3237
4.6 [CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]
Exploitation vector Local network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software Windows
Windows Server
Vulnerable software versions Windows Vista
Windows 7
Windows 8.1
Windows RT 8.1
Windows 10
Windows Server 2008
Windows Server 2008 R2
Windows Server 2012
Windows Server 2012 R2
Vendor URL Microsoft

Security Advisory

1) Kerberos privilege escalation


The vulnerability allows an attacker with access to local network to gain elevated privileges.

The vulnerability exists in Kerberos implementation when handling password change request. A local attacker can make the operating system to fall back to NT LAN Manager (NTLM) Authentication Protocol as the default authentication protocol.

Successful exploitation of this vulnerability will allow a local attacker to launch a man-in-the-middle (MiTM) attack against the traffic passing between a domain controller and the target machine, intercept and decrypt credentials during password change request.

External links

2) Netlogon privilege escalation


The vulnerability allows a local user gain elevated privileges on vulnerable system.

The vulnerability exists due to Windows Netlogon service incorrectly handles secure communication to a domain controller. A local attacker can run arbitrary code on the vulnerable system with elevated privileges.

Successful exploitation of this vulnerability will allow a local user to elevate privileges on the system, joined to Windows Server 2012 or Windows Server 2012 R2 domain controller.

External links

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