Zero-day vulnerability in Windows

Buffer overflow

The vulnerability was privately reported to Microsoft by Kaspersky Lab.

Vulnerability details

Advisory: SB2018111308 - Privilege escalation in Windows Win32k.sys driver

Vulnerable component: Windows

CVE-ID: CVE-2018-8589

CVSSv3 score: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C

CWE-ID: CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer


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

The vulnerability exists due to a boundary error within Win32k.sys driver. A local user can create a specially crafted application, run it on vulnerable system and execute code withe superuser privileges.

Note: this vulnerability is being actively exploited in limited targeted attacks.