Vulnerability identifier: #VU4901

Vulnerability risk: High

CVSSv3.1: 8.4 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2014-6324

CWE-ID: CWE-310

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
Windows
Operating systems & Components / Operating system
Windows Server
Operating systems & Components / Operating system

Vendor: Microsoft

Description
The vulnerability allows a remote authenticated attacker to obtain elevated privileges on the target system.

The weakness exists due to the failure to properly validate signatures in the Kerberos ticket by the Microsoft Kerberos KDC implementation. A remote attacker can forge a ticket and elevate an unprivileged domain user account to a domain administrator account.

Successful exploitation of the vulnerability results in arbitrary code execution on the vulnerable system.

Note: the vulnerability was being actively exploited.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Windows: Vista, 8, 7, 8.1

Windows Server: 2003 - 2012 R2

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External links
http://technet.microsoft.com/en-us/library/security/MS14-068

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.