Vulnerability identifier: #VU18503

Vulnerability risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-8509

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

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

Vendor: Microsoft

Description

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

The vulnerability exists due to a boundary error when processing Microsoft Office files. A remote attacker can create a specially crafted Office document, trick the victim into opening it, trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Microsoft Office: 2010 Service Pack 2, 2007, 2013

Microsoft Word:

Microsoft Word for Mac: 2011 - 2016

Microsoft Office Compatibility Pack:

Microsoft SharePoint Server: 2013 - 2016

Word Automation Services on Microsoft SharePoint Server: 2010 Service Pack 2

Microsoft Office Web Apps: 2010 - 2013 Service Pack 1

Office Online Server : 2016

Microsoft Office Web Apps Server: 2013 Service Pack 1

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External links
http://www.securityfocus.com/bid/98812
http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8509

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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?

No. We are not aware of malware exploiting this vulnerability.