The vulnerability was apparently found and reported to Microsoft by both ╨бrowdStrike and FireEye.
The vulnerability has been actively exploited in the wild for at least five month by highly advanced adversary group named HURRICANE PANDA.
Nuclear Exploit Kit.
Vulnerable component: Windows
CVSSv3 score: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:F/RL:O/RC:C
CWE-ID: CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer
The vulnerability allows a local attacker to obtain elevated privileges on the target system.
The weakness exists due to improper handling of objects in memory by kernel-mode driver (win32k.sys). A local attacker can run a specially crafted application to gain elevated privileges and take complete control of the system.
Successful exploitation of the vulnerability results in arbitrary code execution on the vulnerable system.
Note: the vulnerability was being actively exploited.
Known APT campaigns:
Hurricane Panda is an attack targeting major infrastructure companies.Attack was detected in 2013 and is believed to be of Chinese origin.