Remote code execution in Microsoft Office and Windows HTML

1) Input validation error

EUVDB-ID: #VU78099

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-2023-36884

CWE-ID: CWE-20 - Improper input validation

Exploit availability: Yes

Description

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

The vulnerability exists due to insufficient validation of user-supplied input when handling cross-protocol file navigation. A remote attacker can trick the victim to open a specially crafted file and execute arbitrary code on the system.

Note, the vulnerability is being actively exploited in the wild.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Windows: 10 - 11 22H2

Windows Server: 2008 - 2022 20H2

Microsoft Office: 2013 - 2019

Microsoft Word: 2013 Service Pack 1 - 2019

External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2023-36884
http://www.microsoft.com/en-us/security/blog/2023/07/11/storm-0978-attacks-reveal-financial-and-espionage-motives/
http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV230003

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?

Yes. This vulnerability is being exploited in the wild.