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vSphere UI must limit the maximum size of a POST request.


Finding ID Version Rule ID IA Controls Severity
V-256780 VCUI-70-000003 SV-256780r889339_rule Medium
The "maxPostSize" value is the maximum size in bytes of the POST which will be handled by the container FORM URL parameter parsing. Limit its size to reduce exposure to a denial-of-service attack. If "maxPostSize" is not set, the default value of 2097152 (2MB) is used. The vSphere UI is configured in its shipping state to not set a value for "maxPostSize".
VMware vSphere 7.0 vCenter Appliance UI Security Technical Implementation Guide 2023-06-15


Check Text ( C-60455r889337_chk )
At the command prompt, run the following command:

# xmllint --xpath '/Server/Service/Connector[@port="${http.port}"]/@maxPostSize' /usr/lib/vmware-vsphere-ui/server/conf/server.xml

Expected result:

XPath set is empty

If the output does not match the expected result, this is a finding.
Fix Text (F-60398r889338_fix)
Navigate to and open:


Navigate to each of the nodes.

Remove any configuration for "maxPostSize".

Restart the service with the following command:

# vmon-cli --restart vsphere-ui