I think the safest thing to do would be to take some backups of your ColdFusion9 and CFIDE folder structure. Then apply CHF4 for 9.0.1 plus post CHF security updates APSB13-19 and APSB13-27 (section 2 for 9.0.1). Your ColdFusion9\lib\updates folder will have these JAR files present once you have completed that process - chf9010004 and hf901-00011.
HTH, Carl.