Re: OS/400 User Account Name Disclosure Vulnerability

[Scott Klement <klemscot@xxxxxxxxxxxx>]

On Mon, 4 Mar 2002, Vernon Hamberg wrote:
>
> Properly administered, it would be extremely difficult to
> hack it. It's almost impossible to put a worm or virus or similar item on it.
>

I'm sorry, but this statement is simply wrong.  Writing a worm that runs
on OS/400 is VERY easy.   All you have to do is scan for *CMD objects
that you have authority to change, and insert yourself as the CPP for
those commands.   Then, once your code has been executed, simply call
the original CPP, and nobody ever knows.

Granted, the security on the system could be set up to prevent this.
But it could be on a Unix-based system as well.  I guess if you're
comparing it to Windows, OS/400 is more secure -- but that's REALLY not
saying much.  ANYTHING is more secure than Windows.  And you really
can't compare a single-user OS to a multiple user OS.  Therefore, my
comparisons here are all OS/400 to Unix.

You could also use things like validity checking programs, message
handling programs, etc to write a really powerful (but simple) worm.

The popular "buffer overflow" method of hacking into a system would not
work on an OS/400 system, thanks to the MUCH different way that pointers
work -- however, other methods of hacking would work quite nicely.

I hesitate to list actual methods of hacking an iSeries machine because
of the potential damage that this could do.  The OS/400 community has
always believed in "security by ignorance" -- and I don't agree with that
line of thinking -- but I'm not about to make myself the target of a
lynch mob :)