The vulnerability was exploited by the treat actor Storm-0978 (also known as DEV-0978 or RomCom) against defense and government entities in Europe and North America.
Vulnerability details
Advisory: SB2023071170 - Remote code execution in Microsoft Office and Windows HTML
Vulnerable component: Windows
CVE-ID: CVE-2023-36884
CVSSv3 score: 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
CWE-ID: CWE-20 - Improper input validation
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.
External links:
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2023-36884
https://www.microsoft.com/en-us/security/blog/2023/07/11/storm-0978-attacks-reveal-financial-and-espionage-motives/