AxWay Server Validator (WebServer plug-in) will provide this functionality.
Validation Authority Suite | Axway
The path validation piece is not SiteMinder specific, since that part happens before the SiteMinder WebAgent is invoked, so any Path Validation tool would work, though there are not many solutions available that support SCVP. AxWay Server Validator can either talk to a remote SCVP Validation Authority, or it can be configured to do OID checking internally and use various mechanisms to validate the signing chain (OSCP, CRLDP, etc...)