Multiple vulnerabilities in VMware Cloud Foundation (ESXi)

Published: 2021-07-13

Risk	High
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2021-21994 CVE-2021-21995
CWE-ID	CWE-287 CWE-125
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	Cloud Foundation Client/Desktop applications / Virtualization software
Vendor	VMware, Inc

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Improper Authentication

EUVDB-ID: #VU54814

Risk: High

CVSSv4.0: 6.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2021-21994

CWE-ID: CWE-287 - Improper Authentication

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to an error in when processing authentication requests in SFCB (Small Footprint CIM Broker). A remote attacker can send specially crafted requests to port 5989/tcp, bypass SFCB authentication and gain unauthorized access to the system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Cloud Foundation: 3.10 - 4.2.1

CPE2.3

External links

https://www.vmware.com/security/advisories/VMSA-2021-0014.html

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to open a a specially crafted file.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Out-of-bounds read

EUVDB-ID: #VU54816

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-21995

CWE-ID: CWE-125 - Out-of-bounds read