vSphere UI must limit the maximum size of a POST request.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-256780 | VCUI-70-000003 | SV-256780r889339_rule | Medium |
| 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". |
| STIG | Date |
|---|---|
| VMware vSphere 7.0 vCenter Appliance UI Security Technical Implementation Guide | 2023-06-15 |
Details
| 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: /usr/lib/vmware-vsphere-ui/server/conf/server.xml Navigate to each of the Remove any configuration for "maxPostSize". Restart the service with the following command: # vmon-cli --restart vsphere-ui |