Problems with sudo PATH

[Steve Kreyer <steve.kreyer@web.de>]

Hi all,

after an update of my Debian system some time ago I've encountered some 
problems with sudo. In particular sudo doesn't seem to recognize any 
commands located in /sbin or /usr/sbin. For example the command useradd 
is located in /usr/sbin and sudo fails:
    redwing@platon:~$ sudo useradd
    sudo: useradd: command not found
Another example is ifconfig which is located in /sbin:
    redwing@platon:~$ sudo ifconfig
    sudo: ifconfig: command not found

What could be wrong here? Can I somehow see the content of $PATH within 
the sudo environment? AFAIK "sudo echo $PATH" fails because $PATH is 
evaluated by the shell before sudo is called.

Any help on this issue would be very appreciated.

Kind Regards,
Steve