× The internal search function is temporarily non-functional. The current search engine is no longer viable and we are researching alternatives.
As a stop gap measure, we are using Google's custom search engine service.
If you know of an easy to use, open source, search engine ... please contact support@midrange.com.



This is a multipart message in MIME format.
--
[ Picked text/plain from multipart/alternative ]
All the more reason for vendors to stay current on software, V5+, instead
of running obsolete versions of the OS to support the recalcitrants.

Rob Berendt
--
"They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety."
Benjamin Franklin




"Ed Fishel" <edfishel@us.ibm.com>
Sent by: midrange-l-admin@midrange.com
10/30/2002 09:23 AM
Please respond to midrange-l

        To:     midrange-l@midrange.com
        cc:
        Fax to:
        Subject:        Re: Fix Security (was: Paging file)



From: "Leif Svalgaard" <leif@leif.org>
>From: <vhamberg@attbi.com>>
>> So where's the advantage suggested by your remark? To
>> make "bad" changes on the 400, you still have to have
>> got there with sufficient authority in the first place.
>> And you also need to do that in *nix systems. But once
>> in the system, you're "god", or at least halfway there.
>>
>> But is there any way for someone without *ALLOBJ (and
>> probably a few other rights) to do this tampering on a
>> virgin 400? When there's been no program written to put
>> the job into privileged status? Not if your authority is
>> not high enough, I don't think.
>
>You guys just won't see it. On AS/400 number one (yours)
>you have all the authority you need. You make a program
>(normal user state, no adoption of authority) and patch it
>to make it malware. Then recalculate the program validation
>value and save the program. Transfer the save file to
>another AS/400 (the one you are attacking) and restore
>the malware program. For this you need only enough
>authority to restore the program. You might charm the
>system operator or the user to restore it for you. Maybe
>it is a demo program that also does something useful
>and interesting. Once the program is restored (as it
>will with no problems as it is just a user state program;
>you can even sign it for that matter) you run it and now
>you are God on the other AS/400.

Leif is correct about this security exposure. This is why it is a good
idea
on V5R2 to set the QFRCCVNRST (force conversion on restore) system value
to
6 or 7 to force the retranslation of all restored programs. If the program
was patched this will remove the patches. If the program was created
before
V5R1 and does not have observability it will not be restored to the
system.
All programs created on V5R1 and V5R2 for the current release will have
enough information for them to be retranslated.

When QFRCCVNRST is set to 6, programs that are signed with a valid
signature from a trusted source are restored without retranslation. So be
careful who you trust.

Ed Fishel,
edfishel@us.ibm.com


_______________________________________________
This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing
list
To post a message email: MIDRANGE-L@midrange.com
To subscribe, unsubscribe, or change list options,
visit: http://lists.midrange.com/cgi-bin/listinfo/midrange-l
or email: MIDRANGE-L-request@midrange.com
Before posting, please take a moment to review the archives
at http://archive.midrange.com/midrange-l.




As an Amazon Associate we earn from qualifying purchases.

This thread ...

Replies:

Follow On AppleNews
Return to Archive home page | Return to MIDRANGE.COM home page

This mailing list archive is Copyright 1997-2024 by midrange.com and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available on our policy page. If you have questions about this, please contact [javascript protected email address].

Operating expenses for this site are earned using the Amazon Associate program and Google Adsense.