VMSA-2020-0008:VMware ESXi patches address Stored Cross-Site Scripting (XSS) vulnerability
1. Impacted Products
VMware ESXi
2. Introduction
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.
3a. Advisory Details
Description
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.
Known Attack Vectors
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.
Resolution
To remediate CVE-2020-3955 apply the updates listed in the 'Fixed Version' column of the 'Response Matrix' below.
Workarounds
None.
Additional Documentation
None.
Notes
None.
Acknowledgements
VMware would like to thank Benny Husted, zixian, and DAWUSHI for independently reporting this issue to us.
Response Matrix
| Product | Version | Running On | CVE Identifier | CVSSv3 | Severity | Fixed Version | Workarounds | Additional Documentation |
| ESXi | 7.0 | Any | CVE-2020-3955 | N/A | N/A | Unaffected | N/A | N/A |
| ESXi | 6.7 | Any | CVE-2020-3955 | None | None | |||
| ESXi | 6.5 | Any | 8.3 | None | None |
4. References
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
5. Change Log
2020-04-28 VMSA-2020-0008
Initial security advisory.
6. Contact
E-mail list for product security notifications and announcements:
https://lists.vmware.com/cgi-bin/mailman/listinfo/security-announce
This Security Advisory is posted to the following lists:
[email protected]
[email protected]
[email protected]
E-mail: [email protected]
PGP key at:
https://kb.vmware.com/kb/1055
VMware Security Advisories
https://www.vmware.com/security/advisories
VMware Security Response Policy
https://www.vmware.com/support/policies/security_response.html
VMware Lifecycle Support Phases
https://www.vmware.com/support/policies/lifecycle.html
VMware Security & Compliance Blog
https://blogs.vmware.com/security
Twitter
https://twitter.com/VMwareSRC
Copyright 2020 VMware Inc. All rights reserved.