Zero-day vulnerability in Windows

Buffer overflow

The vulnerability was reported to Microsoft by Vasily Berdnikov and Boris Larin from Kaspersky Lab.

Vulnerability details

Advisory: SB2019040906 - Privilege escalation in Win32k.sys driver in Microsoft Windows

Vulnerable component: Windows

CVE-ID: CVE-2019-0859

CVSSv3 score: CVSS:3.1/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-119 - Memory corruption


The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a boundary error when processing objects in memory within the Win32k component. A local user can create a malicious application, launch it on the system and execute arbitrary code with SYSTEM privileges.

Note: this vulnerability is being actively exploited in the wild.