Remote code execution in Microsoft Excel

1) Input validation error

EUVDB-ID: #VU79179

Risk: High

CVSSv4.0: 5.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2023-36896

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

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 in Microsoft Excel. A remote attacker can trick a victim to open a specially crafted file and execute arbitrary code on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Office Online Server: All versions

Microsoft Office LTSC: 32 bit editions - 2021 for Mac

Microsoft Office: 2019 - 2019 for Mac

Microsoft Excel: 2013 Service Pack 1 - 2016

Microsoft 365 Apps for Enterprise: 32-bit Systems - 64-bit Systems

CPE2.3

• cpe:2.3:a:microsoft:office_online_server:*:*:*:*:*:*:*:*
• cpe:2.3:a:microsoft:microsoft_office_ltsc:32:bit editions:*:*:*:*:*:*
• cpe:2.3:a:microsoft:microsoft_office_ltsc:64:bit editions:*:*:*:*:*:*
• cpe:2.3:a:microsoft:microsoft_office_ltsc:2021:for Mac:*:*:*:*:*:*
• cpe:2.3:a:microsoft:microsoft_office:*:*:*:*:*:*:*:*
• cpe:2.3:a:microsoft:microsoft_office:2019_for_Mac:*:*:*:*:*:*:*
• cpe:2.3:a:microsoft:microsoft_excel:2013_Service_Pack_1:*:*:*:*:microsoft_office:*:*
• cpe:2.3:a:microsoft:microsoft_excel:2013_RT_Service_Pack_1:*:*:*:*:microsoft_office:*:*
• cpe:2.3:a:microsoft:microsoft_excel:*:*:*:*:*:microsoft_office:*:*
• cpe:2.3:a:microsoft:microsoft_365_apps_for_enterprise:32-bit_Systems:*:*:*:*:*:*:*

External links

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2023-36896

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.