Along with the newest Joomla! security update, recently announced on the www.joomla.org website, we too have released a new RSFirewall! revision with the specific 1.5.23 hash files. 
Our recommendation is to update both Joomla! and RSFirewall! to the latest revisions and perform a new System Check.
If you want a detailed video tutorial about performing a new RSFirewall! System Check, head to the RSJoomla! TV channel and watch
Ep. 11 - RSFirewall! - Joomla! Security Scanner.
How to update to RSFirewall! revision 23?
Read the changelog
