Vulnerability identifier: #VU964

Vulnerability risk: Critical

CVSSv3.1: 9.2 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2016-7193

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Microsoft Office
Client/Desktop applications / Office applications
Microsoft Office Compatibility Pack
Client/Desktop applications / Office applications
Microsoft Office for Mac
Client/Desktop applications / Office applications
Microsoft Word
Client/Desktop applications / Office applications
Word Viewer
Client/Desktop applications / Office applications
Office Online Server
Server applications / Other server solutions
Word Automation Services on Microsoft SharePoint Server
Server applications / Other server solutions

Vendor: Microsoft

Description
The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The weakness exists due to boundary error when handling of malicious RTF files by Microsoft Word. A remote attacker can create a specially crafted RTF document, trick the victim into opening it, trigger memory corruption and execute arbitrary code with privileges of the current user.

Successful exploitation of the vulnerability will result in arbitrary code execution.

Note: the vulnerability was being actively exploited.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Microsoft Office: 2010, 2007, 2013 - 2013 RT

Microsoft Office Compatibility Pack:

Microsoft Office for Mac: 2011 - 2016

Office Online Server : 1.0

Microsoft Word:

Word Viewer: 2007

Word Automation Services on Microsoft SharePoint Server: 2010 - 2013

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External links
http://technet.microsoft.com/en-us/library/security/MS16-121

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.