#VU50898 Input validation error in vCenter Server and Cloud Foundation - CVE-2021-21972

Vulnerability identifier: #VU50898

Vulnerability risk: High

CVSSv4.0: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Amber]

CVE-ID: CVE-2021-21972

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
vCenter Server
Server applications / Virtualization software
Cloud Foundation
Client/Desktop applications / Virtualization software

Vendor: VMware, Inc

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to insufficient validation of user-supplied input in vSphere Client. A remote non-authenticated attacker can send a specially crafted HTTP request to port 443/tcp and execute arbitrary code on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

vCenter Server: 6.5 U1 - 7.0.0

Cloud Foundation: before 3.10.1.2

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External links
https://www.vmware.com/security/advisories/VMSA-2021-0002.html
https://kb.vmware.com/s/article/82374
https://noahblog.360.cn/vcenter-6-5-7-0-rce-lou-dong-fen-xi/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.