NULL pointer dereference in Windows and Windows Server - CVE-2019-0808
Published: March 8, 2019 / Updated: June 17, 2021
Vulnerability identifier: #VU17930
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Green
CVE-ID: CVE-2019-0808
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability:
The vulnerability is being exploited in the wild
Vendor: Microsoft
Affected software:
Windows
Windows Server
Windows
Windows Server
Detailed vulnerability description
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a NULL pointer dereference error in the win32k!MNGetpItemFromIndex when NtUserMNDragOver() system call within the win32k.sys kernel driver. A local user can use a specially crafted application to escape sandbox and execute arbitrary code on the target system with SYSTEM privileges.
Note, this vulnerability is being actively exploited in the wild along with vulnerability in Google Chrome described in (SB2019030405).
How to mitigate CVE-2019-0808
Install updates from vendor's website.