Permissions, Privileges, and Access Controls in vCenter Server - CVE-2021-21991

Vulnerability identifier: #VU56791

CSH Severity: Low

CVSS v4: 9.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H]

CVE-ID: CVE-2021-21991

CWE-ID: CWE-264

Exploitation vector: Local access

Exploit availability: No public exploit available

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

The vulnerability exists due to the way the vCenter Server handles session tokens. A local user can escalate privileges to Administrator on the vSphere Client (HTML5) or vCenter Server vSphere Web Client (FLEX/Flash).

vCenter Server
Dell Enterprise Hybrid Cloud
EMC Integrated Data Protection Appliance
IBM Cloud Pak System
Cloud Foundation
Dell EMC VxRail Appliance

Install updates from vendor's website.

vCenter Server - addressed in versions 6.5 U3q, 6.7 U3o, 7.0 U2c
EMC Integrated Data Protection Appliance - update to 2.7.0
IBM Cloud Pak System - update to 2.3.3.4
Cloud Foundation - update to 3.10.2.2
Dell Enterprise Hybrid Cloud - update to 4.1.2
Dell EMC VxRail Appliance - addressed in versions 4.5.463, 4.7.536, 7.0.241

• https://www.vmware.com/security/advisories/VMSA-2021-0020.html

• Multiple vulnerabilities in VMware vCenter Server
• Multiple vulnerabilities in VMware vCloud Foundation
• Multiple vulnerabilities in Dell EMC VxRail Appliance
• Dell EMC Enterprise Hybrid Cloud update for VMware products
• Multiple Vulnerabilities IBM Cloud Pak System
• Multiple vulnerabilities in Dell EMC PowerProtect DP Series (Integrated Data Protection Appliance)