Remote code execution in Microsoft Office

1) Use-after-free

EUVDB-ID: #VU85194

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-2024-20677

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error when parsing FBX files. A remote attacker can trick the victim to open a specially crafted file, trigger a use-after-free error and execute arbitrary code on the target system.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Microsoft Office: 2016 - 2019

Microsoft Office LTSC 2021: 32 bit editions - 2021 for Mac

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

CPE2.3

• cpe:2.3:a:microsoft:microsoft_office:*:*:*:*:*:*:*:*
• cpe:2.3:a:microsoft:microsoft_office:*:*:*:*:*:*:*:*
• cpe:2.3:a:microsoft:microsoft_office_ltsc_2021:32:bit editions:*:*:*:*:*:*
• cpe:2.3:a:microsoft:microsoft_office_ltsc_2021:64:bit editions:*:*:*:*:*:*
• cpe:2.3:a:microsoft:microsoft_office_ltsc_2021:2021:for Mac:*:*:*:*:*:*
• cpe:2.3:a:microsoft:microsoft_365_apps_for_enterprise:32-bit Systems:*:*:*:*:*:*:*
• cpe:2.3:a:microsoft:microsoft_365_apps_for_enterprise:64-bit Systems:*:*:*:*:*:*:*

External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2024-20677
http://www.zerodayinitiative.com/advisories/ZDI-24-030/

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?

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