1) Permissions, Privileges, and Access Controls

Risk: Low

CVSSv3: 6.8 [CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2021-1648

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 due to application does not properly impose security restrictions in Microsoft splwow64, which leads to security restrictions bypass and privilege escalation.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Windows: 8.1, 10, 10 20H2, 10 1607, 10 1803, 10 1809, 10 1909, 10 2004, RT 8.1

Windows Server: 2012, 2012 R2, 2016, 2019, 2019 20H2, 2019 1909, 2019 2004

CPE

• cpe:/o:microsoft:windows:10_1803:
• cpe:/o:microsoft:windows:10_1809:
• cpe:/o:microsoft:windows:10_1909:
• cpe:/o:microsoft:windows:10_2004:
• cpe:/o:microsoft:windows:10:
• cpe:/o:microsoft:windows:10_1607:
• cpe:/o:microsoft:windows:8.1:
• cpe:/o:microsoft:windows:rt_8.1:
• cpe:/o:microsoft:windows:10_20h2:
• cpe:/o:microsoft:windows_server:2019:
• cpe:/o:microsoft:windows_server:2019_1909:
• cpe:/o:microsoft:windows_server:2019_2004:
• cpe:/o:microsoft:windows_server:2016:
• cpe:/o:microsoft:windows_server:2012:
• cpe:/o:microsoft:windows_server:2012_r2:
• cpe:/o:microsoft:windows_server:2019_20h2:

External links

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1648

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?

No. We are not aware of malware exploiting this vulnerability.