Matthijs <[EMAIL PROTECTED]> writes:

> Since a few days, Logcheck reports a lot of messages like this:
>
> ---------------------------------------------------------------------
> Security Violations for su
> =-=-=-=-=-=-=-=-=-=-=-=-=-
> Mar 30 06:25:02 MyMail su[13083]: (pam_unix) session opened for user
> nobody by (uid=0)
> ---------------------------------------------------------------------
>
> I've had similar messages for various users for cron and sshd.
>
> Should I be worried?

Probably not.

> The only way I can read this messages is that user 'nobody' has done a
> 'su' - become root.

No, it's the other way around: 'root' has used 'su' to become 'nobody'.
This is probably part of a script (run by a cronjob?).

Martin


-- 
   ,--.    Martin Dickopp, Dresden, Germany                 ,= ,-_-. =.
  / ,- )   http://www.zero-based.org/                      ((_/)o o(\_))
  \ `-'                                                     `-'(. .)`-'
   `-.     Debian, a variant of the GNU operating system.       \_/


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