RE: Linux (in)security (Was: Re: [Full-Disclosure] Re: No Subject)
From: Bassett, Mark (mbassett_at_omaha.com)
To: "Paul Schmehl" <email@example.com>, <firstname.lastname@example.org> Date: Fri, 24 Oct 2003 13:57:13 -0500
I think something we are also forgetting is that statistically *nix
users are people who are computer geeks. Average joe #1 buys his pc
from Best buy pre-loaded with windows XP and has no clue how to install
it. Currently vendor pre-loaded *nix machines aren't very popular,
which means in order to have linux on your machine, you must
download/purchase it and load it yourself. Most people don't want to
mess with the hassle of the whole thing, aside from the fact that it
doesn't play new game #1313413. All this means is that the *typical*
*nix user knows what they are doing and therefore knows to keep the
--These same users on Windows (and who probably also run windows boxes)
would also be unaffected by the rash of 'sploits--
Until we start seeing vendor pre-loads going to Joe Blow, *nix will
still be the O/S of servers, and geeks. (no offense to geeks out there,
I'm one too ;) )
World media company
From: Paul Schmehl [mailto:email@example.com]
Sent: Wednesday, October 22, 2003 10:19 PM
Subject: Re: Linux (in)security (Was: Re: [Full-Disclosure] Re: No
--On Wednesday, October 22, 2003 6:00 PM -0600 Bruce Ediger
> The real questions go something like:
> "Source code for Unix viruses has been available for years, from
> almost too numerous to mention. Why haven't Unix viruses become
> the way that Windows viruses have?"
The usual argument is that Windows is more ubiquitous than Unix and is
therefore the target of choice. I would argue that the *real* reason is
that Windows is more ubiquitous as a *desktop* operating system and is
therefore the target of choice. However, that's changing. Linux is
gaining in the desktop space and so is Mac OS X, which is really
for the first time. By that I mean that previous Mac OSes weren't as
easily attacked remotely because they used Appletalk rather than TCP/IP.
(Yes, Macophiles, I know TCP/IP was available before OS X.)
The real key to prevalence of malware, IMNSHO, is the ease of attack
the potential pool of victims. People think it's really stupid to
the Internet using an administrator account on Windows. Well what do
think the neophyte Linux users are doing? I seriously doubt you'll find
many that have a regular account and use su or sudo to do administrative
tasks. They're bound to run in to something sooner or later that they
irritating (like being prompted for root's password every time they try
run up2date on RedHat) and they'll do the same thing they always do on a
desktop system. They'll start logging in as root because they don't get
"pestered" by all those warning messages and they can install software
time they want. (Mind you, Windows still has a long way to go in that
regard. MS doesn't make it easy to run as an unprivileged user, that's
And when folks are on the net, logged in as root, on a Unix box, they're
just as susceptible to worms and viruses as any Windows user is. All it
takes is some momentum in the desktop space and the stats will change.
When the average desktop user can figure out how to burn CDs, listen to
music and print on *nix as easily as they can do it on Windows, you'll
more and more malware for *nix as they move over to it (if they do.)
Now I am *not* arguing that Windows is the best OS to use (or even a
one for that matter) or even that Windows is no easier to attack than
But worms and viruses will follow desktop users, not OSes, no question
> "Security problems of the same magnitude as .ida buffer overflows, or
> MSRPC buffer overflows exist in unix programs like Sendmail and
> Why hasn't a worm materialized for this problem?"
Because unpatched apache isn't installed *and* running on *nix boxes by
default. We had 90 boxes hit by Code Red. Only one was an "IT" box,
that one had just been installed and was *at* windowsupdate when it got
infected. Of the other 89, all but three were desktop systems. When
hit, we had 40. All 40 were desktops. People who know what they're
don't get infected with that crap. People who don't, do. What OS
using is irrelevant.
> "The scalper worm didn't effect nearly as many hosts as msblast did.
> Why not? Why did the scalper worm seem to die out, yet wormwatch.org
> still records many hits from much older worms like SQLSpida and
Because desktop users don't patch. Scalper didn't make much headway
because *very few* desktop *nix boxes run Apache, and servers that do
admined by people who understand the need to patch.
Remember the SunOS.Poisonbox.worm? That made pretty good headway on
Solaris boxes and can still be found today. What did it attack?
which few server admins would ever run and far fewer would run
Only desktop users have that on and don't want to be bothered with
patching. And they got infected. Every *nix infection that I've had to
deal with has been a desktop system, not a server.
Why do you think wuftpd is so heavily attacked? I think it's because
had many holes *and* lots of desktop users run it because it lets them
easily move files around.
> And I guess you can generalize and ask why the Windows "culture"
> so many problems of such a magnitude, that last so long? My home
> web server got a Code Red hit on Sept 19th 2003, for example. Other
> computing cultures (Unix, Mac, etc) don't seem to exhibit this. Why
Well, historically *nix was for the clued in. All others were excluded.
And Mac wasn't easily exploited due to Appletalk. But all that's
KDE has been riddled with security problems. Once the number of desktop
users using KDE reaches critical mass (whatever that is) you'll start
seeing more and more malware on *nix. Malware follows negligent users,
> Shouldn't we focus our efforts on figuring out what aspects of Linux
> Mac cultures keep epidemics from occuring? It's certainly a waste of
> breath to point out that OS X has horrendous security flaws when none
> them turn into grotesque epidemics like Sobig.f.
Well, think about it for a minute. You're going to write a virus that's
designed to trojan machines so you can use them in a massive distributed
spam network. What do you attack? The 5 million Mac machines
Or the 150 million Windows boxes? If your rate of success is 1 in 500,
get 2,000 bots with Mac and 300,000 with Windows. Which would you
I don't doubt that there is some politicization in malware production
(people who hate Gates and his OS and want to embarrass him any way they
can), but most malware authors are simply trying to get the most bang
the buck, if you will. They'll follow the desktop crowd wherever it
them. And they won't have any more difficulty infecting KDE users than
they do Windows users.
Paul Schmehl (firstname.lastname@example.org)
Adjunct Information Security Officer
The University of Texas at Dallas
AVIEN Founding Member
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