Vulnerability identifier: #VU21650

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-2019-1331

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Microsoft Excel
Client/Desktop applications / Office applications
Microsoft Office
Client/Desktop applications / Office applications
Microsoft Office for Mac
Client/Desktop applications / Office applications
Excel Services on Microsoft SharePoint Server
Client/Desktop applications / Office applications
Office Online Server
Server applications / Other server solutions
Microsoft SharePoint Server
Server applications / Application servers

Vendor: Microsoft

Description

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

The vulnerability exists due to insufficient validation of user-supplied input when the software fails to properly handle objects in memory in Microsoft Excel software.

Successful exploitation of the vulnerability allows remote code execution but requires that a user open a specially crafted file with an affected version of Microsoft Excel.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Microsoft Excel:

Microsoft Office: 2010 Service Pack 2, 2013 - 2013 RT, 2019 - 2019 for Mac, 365 ProPlus

Microsoft Office for Mac: 2016

Office Online Server : 2016

Microsoft SharePoint Server: 2013

Excel Services on Microsoft SharePoint Server: 2010

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External links
http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1331

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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.