> PAM_UNIX[763]: (su) session opened for user www-data by (uid=0)
> su [821]: + ??? root-nobody
> 
> PAM_UNIX[821]: (su) session opened for user nobody by (uid=0) 

> anymore (I do assume that it is an intrusion attack,
> unless there is a much simpler explanation for this).

No intrusion. It's just the normal behaviour of (a) the web server
(httpd) and (b) many other daemons:
they change their uid to (a) www-data , (b) nobody in order
to make (possible) security holes less painful.


-- 
Michael Wuertz <[EMAIL PROTECTED]>      Tel: +49-6151-16-5812

* magic is real - unless declared integer *

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