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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-239654 | VCST-67-000003 | SV-239654r816687_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 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 6.7 STS Tomcat Security Technical Implementation Guide | 2022-01-03 |
Details
| Check Text ( C-42887r816685_chk ) |
|---|
| Connect to the PSC, whether external or embedded. At the command prompt, execute the following command: # xmllint --format /usr/lib/vmware-sso/vmware-sts/conf/server.xml | sed '2 s/xmlns=".*"//g' | xmllint --xpath '/Server/Service/Connector[@port="${bio-custom.http.port}"]/@maxPostSize' - Expected result: XPath set is empty If the output does not match the expected result, this is a finding. |
| Fix Text (F-42846r816686_fix) |
|---|
| Connect to the PSC, whether external or embedded. Navigate to and open /usr/lib/vmware-sso/vmware-sts/conf/server.xml. Navigate to each of the Remove any configuration for "maxPostSize". |