vSphere UI must limit the maximum size of a POST request.
Severity | Group ID | Group Title | Version | Rule ID | Date | STIG Version |
|---|---|---|---|---|---|---|
| medium | V-256780 | SRG-APP-000001-WSR-000001 | VCUI-70-000003 | SV-256780r889339_rule | 2023-06-15 | 1 |
| Description |
|---|
| 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". |
| ℹ️ Check |
|---|
| 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 |
|---|
| Navigate to and open: /usr/lib/vmware-vsphere-ui/server/conf/server.xml Navigate to each of the <Connector> nodes. Remove any configuration for "maxPostSize". Restart the service with the following command: # vmon-cli --restart vsphere-ui |