SB2021052634 - Multiple vulnerabilities in VMware vCenter Server

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Main Vulnerability Database SB2021052634

SB2021052634 - Multiple vulnerabilities in VMware vCenter Server

Published: May 26, 2021

Security Bulletin ID SB2021052634
Severity
Critical
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

Critical 50% Medium 50%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 secuirty vulnerabilities.


1) Input validation error (CVE-ID: CVE-2021-21985)

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to insufficient validation of user-supplied input within the Virtual SAN Health Check plug-in, which is enabled by default. A remote non-authenticated attacker can send a specially crafted HTTP request to the vSphere Client available at port 443/tcp and execute arbitrary commands with unrestricted privileges on the underlying operating system that hosts vCenter Server.


2) Improper Authentication (CVE-ID: CVE-2021-21986)

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to an error in when processing authentication requests to the Virtual SAN Health Check, Site Recovery, vSphere Lifecycle Manager, and VMware Cloud Director Availability plug-ins. A remote non-authenticated attacker can bypass authentication process and gain unauthorized access to the application.


Remediation

Install update from vendor's website.

References