Zero-day vulnerability in Windows

Buffer overflow
CVE-2018-8120

The vulnerability was reported by ESET in March 2018. The attackers used this vulnerability along with double free error in Adobe Acrobat CVE-2018-4990.

Known malware:

Win32/Exploit.CVE-2018-8120.A trojan (ESET)

Vulnerability details

Advisory: SB2018050813 - Privilege escalation in Microsoft Windows win32k.sys driver

Vulnerable component: Windows

CVE-ID: CVE-2018-8120

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

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

Description:

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

The vulnerability exists due to boundary error in win32k.sys driver. A local user can execute arbitrary code with SYSTEM privileges.

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