Remote code execution in Microsoft Excel



Published: 2021-11-09
Risk Critical
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-42292
CWE-ID CWE-20
Exploitation vector Network
Public exploit This vulnerability is being exploited in the wild.
Vulnerable software
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Microsoft Office
Client/Desktop applications / Office applications

Microsoft Excel
Client/Desktop applications / Office applications

Vendor Microsoft

Security Bulletin

This security bulletin contains one critical risk vulnerability.

1) Input validation error

EUVDB-ID: #VU58058

Risk: Critical

CVSSv3.1: 8.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2021-42292

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to improper input validation when processing Excel files. A remote attacker can create a specially crafted Excel file, trick the victim into opening it and execute arbitrary code on the system.

Note, the vulnerability is being exploited in the wild.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Microsoft Office: 2013, 2013 RT, 2016, 2019, 2019 for Mac

Microsoft Excel: 2013, 2013 RT Service Pack 1, 2016

CPE2.3 External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42292

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to visit a specially crafted website or open a file.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.



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