The vulnerability was being used in CNACOM campaign targeting government organization in Taiwan.
Vulnerable component: Windows
CVSSv3 score: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C
CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
The vulnerability allows a remote attacker to gain elevated privileges on the target system.
The weakness exists due to insufficient validation of user-supplied input within TS WebProxy Windows component. A remote attacker can trick the victim into downloading a specially crafted file and execute it with privileges of the current user.
Successful exploitation of the vulnerability may result in full control of the vulnerable system.
Note: the vulnerability was being actively exploited.
Known APT campaigns:
The campaign mainly targeted Taiwanese organizations and supposedly has Chinese origin.