Permissions, Privileges, and Access Controls in Microsoft Windows and Windows Server - CVE-2021-31958

Vulnerability identifier: #VU53882

CSH Severity: Medium

CVSS v4: 7.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-31958

CWE-ID: CWE-264

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to escalate privileges on the system.

The vulnerability exists due to application does not properly impose security restrictions in the Windows NTLM. A remote attacker can trick a victim to visit a specially crafted server share or website, which leads to security restrictions bypass and privilege escalation.

Microsoft Windows
Windows Server
Dell EMC VNXe3200
Solutions Enabler Virtual Appliance
Solutions Enabler
Unisphere for PowerMax Virtual Appliance
Unisphere for PowerMax

Install updates from vendor's website.

Dell EMC VNXe3200 - update to 3.1.17.10229825
Solutions Enabler Virtual Appliance - addressed in versions 9.1.0.17, 9.2.2.0
Solutions Enabler - addressed in versions 9.1.0.17, 9.2.2.0
Unisphere for PowerMax Virtual Appliance - addressed in versions 9.1.0.28, 9.2.2.2
Unisphere for PowerMax - addressed in versions 9.1.0.28, 9.2.2.2

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31958

• Privilege escalation in Microsoft Windows NTLM
• Privilege escalation in Dell EMCVNXe3200
• Multiple vulnerabilities in Dell EMC Unisphere for PowerMax and Dell EMC Solutions Enabler