Zero-day vulnerability in Windows

Elevation of privilege
CVE-2017-0263

The vulnerability was used by APT28 team along with another zero-day CVE-2017-0262.

Known malware:

GAMEFISH

Vulnerability details

Advisory: SB2017050908 - Multiple vulnerabilities in Win32.sys in Microsoft Windows

Vulnerable component: Windows

CVE-ID: CVE-2017-0263

CVSSv3 score: CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C

CWE-ID: CWE-20 - Improper Input Validation

Description:

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

The vulnerability exists due to boundary error in Win32k.sys driver. A local user can escalate privileges on the system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Note: this vulnerability is being actively exploited.