Permissions, Privileges, and Access Controls in Microsoft Windows and Windows Server - CVE-2021-43893

Vulnerability identifier: #VU58952

CSH Severity: Medium

CVSS v4: 7.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-43893

CWE-ID: CWE-264

Exploitation vector: Remote access

Exploit availability: Public exploit is available

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

The vulnerability exists due to application does not properly impose security restrictions in Windows Encrypting File System (EFS), which leads to security restrictions bypass and privilege escalation.

Microsoft Windows
Windows Server
Solutions Enabler Virtual Appliance
Solutions Enabler
Unisphere 360
Unisphere for PowerMax Virtual Appliance
Unisphere for PowerMax
VASA Provider Standalone

Install updates from vendor's website.

Solutions Enabler Virtual Appliance - addressed in versions 9.1.0.19, 9.2.3.1
Solutions Enabler - addressed in versions 9.1.0.19, 9.2.3.1
Unisphere 360 - addressed in versions 9.1.0.30, 9.2.3.4
Unisphere for PowerMax Virtual Appliance - addressed in versions 9.1.0.32, 9.2.3.11
Unisphere for PowerMax - addressed in versions 9.1.0.32, 9.2.3.11
VASA Provider Standalone - addressed in versions 9.1.0.724, 9.2.3.10

• Exploit #7350 - blankspace (Proof of Concept for EFSRPC Arbitrary File Upload (CVE-2021-43893)) (February 14, 2022)

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-43893

• Multiple vulnerabilities in Microsoft Windows Encrypting File System (EFS)
• Multiple vulnerabilities in Dell Unisphere for PowerMax, Dell Solutions Enabler, Dell Unisphere 360 and Dell VASA Provider