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The Security Token Service must limit the maximum size of a POST request.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-256747 | VCST-70-000003 | SV-256747r889211_rule | Medium |
| Description |
|---|
| The "maxPostSize" value is the maximum size in bytes of the POST that will be handled by the container FORM URL parameter parsing. Limit its size to reduce exposure to a denial-of-service (DoS) attack. If "maxPostSize" is not set, the default value of 2097152 (2MB) is used. Security Token Service is configured in its shipping state to not set a value for "maxPostSize". |
| STIG | Date |
|---|---|
| VMware vSphere 7.0 vCenter Appliance STS Security Technical Implementation Guide | 2023-02-21 |
Details
| Check Text ( C-60422r889209_chk ) |
|---|
| At the command prompt, run the following command: # xmllint --xpath '/Server/Service/Connector[@port="${bio-custom.http.port}"]/@maxPostSize' /usr/lib/vmware-sso/vmware-sts/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-60365r889210_fix) |
|---|
| Navigate to and open: /usr/lib/vmware-sso/vmware-sts/conf/server.xml Navigate to each of the Remove any configuration for "maxPostSize". Restart the service with the following command: # vmon-cli --restart sts |