vSphere UI must limit the number of allowed connections.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-256797 | VCUI-70-000020 | SV-256797r889390_rule | CCI-001094 | medium |
| Description | ||||
| Limiting the number of established connections is a basic denial-of-service protection and a best practice. Servers where the limit is too high or unlimited can run out of system resources and negatively affect system availability. | ||||
| STIG | Date | |||
| VMware vSphere 7.0 vCenter Appliance UI Security Technical Implementation Guide | 2023-06-15 | |||
Details
Check Text (C-256797r889390_chk)
At the command prompt, run the following command:
# xmllint --xpath '/Server/Service/Connector[@port="${http.port}"]/@acceptCount' /usr/lib/vmware-vsphere-ui/server/conf/server.xml
Expected result:
acceptCount="300"
If the output does not match the expected result, this is a finding.
Fix Text (F-60415r889389_fix)
Navigate to and open:
/usr/lib/vmware-vsphere-ui/server/conf/server.xml
Navigate to the <Connector> configured with port="${http.port}".
Add or change the following value:
acceptCount="300"
Restart the service with the following command:
# vmon-cli --restart vsphere-ui