web shells

[LaNx`]

i uploaded a web shell thats called c99 shell and i tryed to root my own box to see if it can work and i got as fare as going into other clients directorys and changing there files or deleting there files. i want to know how can i stop all web shells like c99 from loading. i allready tryed safe mode but you can just bypass that can someone please show me or tell me how i can make all web shells like that not load.

[katmai]

disable_functions = show_source, system, shell_exec, passthru, exec, phpinfo, popen, proc_open, allow_url_fopen

do this in php.ini, then check if anything is broken, as some functions may break some apps. usually should not but depends on the apps, and elliminate the specific disable function from php. this should work pretty fine.