Re: BugTraq Exploit for OS/400

[Dr Syd Nicholson <sydnic@xxxxxxxxxx>]

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You are absolutely right.

What I was trying to say was - the greatest threat to the system comes
from inside the organisation. From people who already have a valid sign
on. It is they who have access to this information which they could then
use to hack other integral servers (eg. FTP, ODBC).

If a hacker from outside the organisation has successfully hacked a 5250
session, the system is compromised, and could be under greater threat.

Syd Nicholson
Castlehill Computer Services Ltd.


James Rich wrote:

>On Mon, 25 Feb 2002, Dr Syd Nicholson wrote:
>
>>Are we not all missing the point here??
>>
>>In order to use the use the System Request menu the user has signed on.
>>They have a user ID and password. If this is an unauthorised person the
>>system is already compromised. The system has already been hacked!!!
>>
>
>Not all vulnerabilities are remote or can be exploited without a valid
>login.  A vulnerability is a situation where some user can do something
>that that user is not allowed to do.  The fact that a certain
>vulnerability cannot be exploited remotely or requires a valid login
>to be exploited does not mean that it is not a security breach.
>
>>If the signed-on user is authorised to use the system, they probably
>>know the other User IDs anyway.
>>
>>If your system has been hacked - 5250 sessions are the least of the
>>problem - check out FTP and ODBC, these are MUCH more dangerous. If the
>>installed applications do not allow sufficient flexibility regarding
>>configuring the security of OS/400, consider using exit point security
>>programs to close back door access to the system.
>>
>
>That there are many methods to break into systems is not the point.  That
>this particular exploit requires a valid login is not the point.  That
>some program or service can be tricked into doing something it was not
>designed to do is the point.
>
>Who's clever sig is it that says, "there are two types of programs...
>those that do what they are supposed and those that don't.  I use the
>latter." ?
>
>James Rich
>james@eaerich.com
>
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