On March 7th Google has reported in the wild exploitation of vulnerability in Microsoft Windows. During the attack the adversary used another zero-day vulnerability in Google Chrome in order to execute code on the system and vulnerability in Microsoft Windows to escalate privileges.
The initial attack was detected in late February.
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:H/RL:O/RC:C
CWE-ID: CWE-476 - NULL Pointer Dereference
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a NULL pointer dereference error in the win32k!MNGetpItemFromIndex when NtUserMNDragOver() system call within the win32k.sys kernel driver. A local user can use a specially crafted application to escape sandbox and execute arbitrary code on the target system with SYSTEM privileges.
Note, this vulnerability is being actively exploited in the wild along with vulnerability in Google Chrome described in (SB2019030405).