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