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Article #92

Re: is wide-open tftpd ever needed for install from remote?

#92
From: Dave Olson
Date: Wed, 06 Jan 1993 21:19
36 lines
2375 bytes
In <C0G7I2.JM3@helios.physics.utoronto.ca> sysmark@helios.physics.utoronto.ca (Mark Bartelt) writes:

| Last month Dave Dittrich posted an article taking SGI to task for the
| fact that IRIX's initial /etc/passwd includes several accounts which
| have null passwords, a potential worry if the system is attached to a
| network.  (He's not the first to grouse about this, nor is he likely
| to be the last.)  Anyway, that discussion reminded me of yet another
| security-related issue ...
| 
| Section 3.2 of the IRIS Software Installation Guide ("Enabling Network
| Access to Remote Workstations") suggests modifying inetd.conf so that
| tftpd runs in unrestricted mode.  I wonder how many people have done
| this, and have forgotten to put tftpd back into restricted mode.

That *exact* same section explictly reminds you to put it back.
It *also* tells you how you can modify the entry to leave security
on, but only allow a couple of directories.

| But my question is, why should this ever be necessary at all?  Right
| after suggesting that the tftpd "-s ..." stuff be removed, the guide
| tells us that we might want to consider appending "<CDdir>/dist" (or
| whatever) to the "-s /usr/local/boot" at the end of the tftpd entry
| in inetd.conf instead, which certainly seems preferable.

Because we did *just* that first, and an amazing number of people didn't
seem to be able to handle the typing involved ;)

| Given the security worries related to a unrestricted-mode tftpd, why
| does the documentation even suggest running it that way in the first
| place?

See above.
--
Let no one tell me that silence gives consent,  |   Dave Olson
because whoever is silent dissents.             |   Silicon Graphics, Inc.
    Maria Isabel Barreno                        |   olson@sgi.com
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Message-ID: <ui2dla0@zuni.esd.sgi.com>
Path: arc1-ca.pugleaf.net!sparky!uunet!zaphod.mps.ohio-state.edu!darwin.sura.net!sgiblab!sgigate!odin!twilight!zuni!anchor!olson
References: <1992Dec24.193457.16465@u.washington.edu> <C0G7I2.JM3@helios.physics.utoronto.ca>

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Newsgroups: comp.sys.sgi.admin,comp.sys.sgi
Path: arc1-ca.pugleaf.net!sparky!uunet!zaphod.mps.ohio-state.edu!darwin.sura.net!sgiblab!sgigate!odin!twilight!zuni!anchor!olson
From: olson@anchor.esd.sgi.com (Dave Olson)
Subject: Re: is wide-open tftpd ever needed for install from remote?
Message-ID: <ui2dla0@zuni.esd.sgi.com>
Sender: news@zuni.esd.sgi.com (Net News)
Organization:  Silicon Graphics, Inc.  Mountain View, CA
References: <1992Dec24.193457.16465@u.washington.edu> <C0G7I2.JM3@helios.physics.utoronto.ca>
Date: Wed, 6 Jan 93 21:19:38 GMT
Lines: 36