Privilege escalation in Win32k.sys driver in Microsoft Windows

1) Buffer overflow

EUVDB-ID: #VU18160

Risk: Medium

CVSSv3.1: 8.4 [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]

CVE-ID: CVE-2019-0859

CWE-ID: CWE-119 - Memory corruption

Exploit availability: Yes

Description

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

The vulnerability exists due to a boundary error when processing objects in memory within the Win32k component. A local user can create a malicious application, launch it on the system and execute arbitrary code with SYSTEM privileges.

Note: this vulnerability is being actively exploited in the wild.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Windows: 7 - 10

Windows Server: 2008 R2 - 2019 1803

CPE2.3

• cpe:2.3:o:microsoft:windows:*:*:*:*:*:*:*:
• cpe:2.3:o:microsoft:windows:8.1:*:*:*:*:*:*:
• cpe:2.3:o:microsoft:windows:10 1607:10.0.14393.10:*:*:*:*:*:
• cpe:2.3:o:microsoft:windows:10 1703:10.0.15063.138:*:*:*:*:*:
• cpe:2.3:o:microsoft:windows:10 1709:10.0.16299.19:*:*:*:*:*:
• cpe:2.3:o:microsoft:windows:10 1803:10.0.17134.48:*:*:*:*:*:
• cpe:2.3:o:microsoft:windows:10 1809:10.0.17763.1:*:*:*:*:*:
• cpe:2.3:o:microsoft:windows:*:*:*:*:*:*:*:
• cpe:2.3:o:microsoft:windows_server:*:*:*:*:*:*:*:
• cpe:2.3:o:microsoft:windows_server:*:*:*:*:*:*:*:

External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0859

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.