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A Stored Cross-Site Scripting (XSS) vulnerability in VMware ESXi was privately reported to VMware. Patches are available to address this vulnerability in affected VMware products.

The VMware ESXi Host Client does not properly neutralize script-related HTML when viewing virtual machines attributes. VMware has evaluated the severity of this issue to be in the Important severity range with a maximum CVSSv3 base score of 8.3.

A malicious actor with access to modify the system properties of a  virtual machine from inside the guest os (such as changing the hostname of the virtual machine) may be able to inject malicious script which will be executed by a victim's browser when viewing this virtual machine via the ESXi Host Client.

To remediate CVE-2020-3955 apply the updates listed in the 'Fixed Version' column of the 'Response Matrix' below.
 

None.

None.

None.

VMware would like to thank Benny Husted, zixian, and DAWUSHI for independently reporting this issue to us.

Fixed Version(s) and Release Notes:
 
VMware ESXi 6.7 ESXi670-202004103-SG
https://my.vmware.com/group/vmware/patch

https://docs.vmware.com/en/VMware-vSphere/6.7/rn/esxi670-202004002.html
 
VMware ESXi 6.5 ESXi650-201912104-SG

https://my.vmware.com/group/vmware/patch

https://docs.vmware.com/en/VMware-vSphere/6.5/rn/esxi650-201912002.html

Mitre CVE Dictionary Links
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-3955
 
FIRST CVSSv3 Calculator
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

2020-04-28 VMSA-2020-0008

Initial security advisory.

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This Security Advisory is posted to the following lists:
  security-announce@lists.vmware.com
  bugtraq@securityfocus.com
  fulldisclosure@seclists.org
 
E-mail: security@vmware.com
PGP key at:
https://kb.vmware.com/kb/1055
 
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https://www.vmware.com/security/advisories
 
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https://www.vmware.com/support/policies/security_response.html
 
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https://blogs.vmware.com/security
 
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