Vulnerability identifier: #VU4865

Vulnerability risk: Medium

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

CVE-ID: CVE-2014-4113

CWE-ID: CWE-119

Exploitation vector: Local

Exploit availability: Yes

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

Vendor: Microsoft

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

The weakness exists due to improper handling of objects in memory by kernel-mode driver (win32k.sys). A local attacker can run a specially crafted application to gain elevated privileges and take complete control of the system.

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 Server: 2003 - 2012 R2

Windows: 8.1 - 8.1 RT, 8, 7, Vista

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External links
http://technet.microsoft.com/en-us/library/security/ms14-058

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.