Zero-day vulnerability in Windows

Memory corruption
CVE-2019-0797

Kaspersky Lab has detected and reported a zero-day vulnerability in Win32k.sys driver in Microsoft Windows.

Vulnerability details

Advisory: SB2019031204 - Privilege escalation in Microsoft Windows Win32k.sys driver

Vulnerable component: Windows

CVE-ID: CVE-2019-0797

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

Description:

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

The vulnerability exists due to a boundary error within the Win32k.sys driver. A local user can execute a specially crafted application, trigger memory corruption and execute arbitrary code on the target system with elevated privileges.

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

External links:

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0797

About zero-day vulnerabilities

Zero-day vulnerability is an undisclosed vulnerability in software that hackers can exploit to compromise computer programs, gain unauthorized access to sensitive data, penetrate networks, etc. We consider vulnerability a zero-day when there is no solution provided from software vendor and the vulnerability is being actively exploited by malicious actors.

Zero-day candidate is a potential zero-day vulnerability in software which might have been used in targeted attacks, however there is no evidence to support this suggestion.