Vulnerability identifier: #VU5184

Vulnerability risk: Critical

CVSSv3.1: 8.1 [CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2014-4077

CWE-ID: CWE-264

Exploitation vector: Network

Exploit availability: No

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 improper access control in Microsoft implementation of Input Method Editor (IME) for Japanese language. A remote attacker can create a specially crafted file designed to invoke a vulnerable sandboxed application, trick the victim into opening it, gain elevated privileges and execute arbitrary code with privileges of the current user.

Successful exploitation of the vulnerability may result 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, 7

Windows Server: 2003 - 2008

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External links
http://technet.microsoft.com/en-us/library/security/ms14-078

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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.