diff --git a/kippo/commands/base.py b/kippo/commands/base.py
index 6e6a07a..721e65d 100644
--- a/kippo/commands/base.py
+++ b/kippo/commands/base.py
@@ -317,5 +317,8 @@ commands['/bin/bash'] = command_nop
 commands['/bin/sh'] = command_nop
 commands['/bin/kill'] = command_nop
 commands['/bin/su'] = command_nop
+commands['/bin/chown'] = command_nop
+commands['/bin/chgrp'] = command_nop
+commands['/usr/bin/chattr'] = command_nop
 
 # vim: set sw=4 et: