Privilege escalation in Microsoft Windows NTFS



Published: 2021-06-08
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2021-31956
CWE ID CWE-264
Exploitation vector Local
Public exploit This vulnerability is being exploited in the wild.
Vulnerable software
Subscribe
Windows
Operating systems & Components / Operating system

Windows Server
Operating systems & Components / Operating system

Vendor Microsoft

Security Advisory

This security advisory describes one medium risk vulnerability.

1) Permissions, Privileges, and Access Controls

Risk: Medium

CVSSv3.1: 7.5 [CVSS:3.1/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-2021-31956

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

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

The vulnerability exists within the NTFS subsystem in Microsoft Windows. A local user can run a specially crafted program to execute arbitrary code with elevated privileges.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Windows: 7, 8.1, 10, 10 20H2, 10 21H1, 10 1607, 10 1809, 10 1909, 10 2004, RT 8.1

Windows Server: 2008, 2008 R2, 2012, 2012 R2, 2016, 2019, 2019 20H2, 2019 2004

CPE External links

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31956

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.



###SIDEBAR###