Privilege escalation in Windows Win32k.sys driver

Published: 2018-11-13
Severity Medium
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2018-8589
CWE ID CWE-119
Exploitation vector Local
Public exploit This vulnerability is being exploited in the wild.
Vulnerable software Windows Server Subscribe
Windows
Vendor Microsoft

Security Advisory

This security advisory describes one medium risk vulnerability.

1) Buffer overflow

Severity: Medium

CVSSv3: 7.5 [CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C] [PCI]

CVE-ID: CVE-2018-8589

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 a boundary error within Win32k.sys driver. A local user can create a specially crafted application, run it on vulnerable system and execute code withe superuser privileges.

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

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Windows Server: 2008, 2008 R2

Windows: 7

CPE External links

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8589

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.