Remote code execution in Microsoft Word

1) Code Injection

EUVDB-ID: #VU52143

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-2021-28453

CWE-ID: CWE-94 - Improper Control of Generation of Code ('Code Injection')

Exploit availability: No

Description

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

The vulnerability exists due to improper input validation in Microsoft Word. A remote attacker can send a specially crafted request and execute arbitrary code on the target system.

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

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Microsoft SharePoint Server: 2010 - 2019

Microsoft Office: 2010 Service Pack 2 - 2019 for Mac

Office Online Server : 2016

Microsoft Word: 2010 - 2016

Microsoft Office Web Apps: 2010 Service Pack 2

Microsoft Office Web Apps Server: 2013 Service Pack 1

External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-28453

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.