Josh More – Starmind Blog

I know that many of you only read this blog for the security and business information.  However, I have hopes that you enjoy the Tuesday natural history musings, and in that vein, I want to make you aware of the situation going on in Fargo, ND.  This is a bit more personal that most of my other postings, but I hope that you'll understand the reasons why this post has little to nothing to do about I.T. or security.

Some of you may have heard about the massive flooding in Fargo, ND. Well, for the moment, the Red River Zoo is safe, but many of the homes and businesses in Fargo are not. To help out, the zoo is accepting people's exotic pets so that they can be cared for while the rest of Fargo flees. It's a small zoo, but a good one. Some of you may recall the photos I've taken there.

This zoo is special. It's fairly young and has a very small staff. Yet, they have managed to:

Breed Russian Red Tree Squirrels (See the blog)

Raise Pallas' Cats

Breed Sichuan Takins (See the blog)

Raise Red Pandas

Along with many many others. (See the blogs for the porcupines and wolves.)

But here's the thing. Unlike some of the larger zoos out there, this zoo is funded entirely with donations, and have managed to do one heck of job without using public funds. During and immediately after a disaster like what is impacting Fargo, the monies that are available tend to dry up. At the same time, we have a zoo that operates on a skeleton staff bending over backwards to save people's pets. They need money to pay for the new animals and to keep things going until things start to get better.

I've made a quick PayPal account for them. I know that many of you are focusing efforts on things like:

• Helping save Peter and Erika's house
• Fighting against racism, direct and subtle
• Helping Tzaddia Morningstar pay for cancer treatment

These are all worthy causes, and I'm not asking you to take anything away from them. All I ask is that if you have a spare $5, $10 or $20, can you toss it towards the Red River Zoo to help feed some animals.

I'm going to let this run for a few weeks, sweeping the account every Friday. I'll send them a check for whatever is there to help them operate during the crisis. When it's all done, I'll close the PayPal account. There will be no auction and not a lot of bugging. All I'm asking is:

• If you can afford to drop a few dollars, please do so.
• If you can direct people to this post, so that others can drop a few dollars in the account, please do so.

The donation button is here:

If you prefer to send a check, you may do so to:

Flood Contributions
The Red River Zoo
4220 21st Ave SW
Fargo, ND 58104

If you have any questions, please leave a comment.

Thank you.

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If you're dealing with a DDOS attack, I'm afraid that I haven't much good news for you. Once it's started, it may be a bit late to try to deal with it. Odds are, you're best off just waiting it out. Failing that, you can try to change IP addresses on your external systems, however, that technique is less effective than it was and requires the assistance of your ISP.

No, the right way to handle this sort of attack is long before it starts.

These sorts of attacks tend to start a bit slowly, and can be recognized by a ramping up of traffic. However, in order to detect it, you have to first know what legitimate traffic looks like. Thus, for months before the attack, you have to be watching what's coming in. You should know what "normal" looks like, so you can detect "abnormal". Not only will this help you differentiate an attack from simply outgrowing your resources, but it will also help you identify how you are using your resources so you don't waste your money.

Bear in mind that most Internet connections can only carry so much, and if your employees are using it watching YouTube videos, that leaves less for legitimate customers. The first rule is to know what you have and how it's being used. To reference Tuesday's post, you need to know how many rats are normal, so you know when you're about to have too many of them.

Then, you can move on to attack avoidance. There are systems out there that are specifically designed to handle DDOS attacks, but let's assume that you don't want to pay for that. One quick solution is to use a set of proxies. These can be servers or network devices in a proxy configuration. The way these work is to simply receive connections and then balance them to the back-end server. Here, you can set up rules to drop illegitimate traffic to reduce what goes through to your server to a manageable amount. There are many technical ways to do this, and none of them are perfect... however, you don't need perfect. You just need to drop enough traffic to get things working again. (In other words, you don't need to stop all the rats, you just need to make sure that there's enough grain for you and your family to eat.)

However, this solution only works assuming that the attack is somewhat small in scope. If the amount of traffic is overwhelming and your connection itself can't handle it, having a set of proxies won't help you much. You'll need to call your ISP. This is why it's good to have a good business relationship with your ISP. You should know the names and numbers of who you need to call, and you'll need them to be technically competent. Ideally, you should be able to call them up, and say "I think I'm having a DDOS attack, can you block all traffic from Asia" (assuming that you don't do business in Asia, of course :). This is like asking for international help in the face of a massive influx of rats.

The huge ISPs tend to have the technical skill, but lack the personal relationship. The really small ISPs will bend over backwards to help you, but may not know how. I suggest going for the middle of the road approach. Interview prospective ISPs and ask how they would handle this sort of situation. Ask if they can give you an emergency number that would always have a live person answering, 24x7. The good ones will, though they might charge you when you call after hours. This is well worth it.

In the end, you will have built an infrastructure that is resistant enough and built a business relationship that is flexible enough. The only way to be 100% protected against this sort of attack is to have more resources than the rest of the Internet combined, and that's just not going to happen. This sort of preparation is fairly cheap, and worth a lot if you need to leverage it.

In the end, it's cheap insurance.

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• Small Business Attack – Denial of Service (2)
• Security Lessons from Nature – Rats, Bamboo and Surprises (0)
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You get the call from your front-line people. Your web site is down and customers are complaining. You call your web folks and they can't even get to the server. Then, your front-line people call you again and report that the entire Internet connection is down. You call your ISP, and they tell you that your line is up, but you're getting a lot of traffic.

Their solution? Buy more bandwidth.

In fact, if you buy right now, you might even have it in a few weeks.

What has happened is a distributed denial of service attack. In this attack, the attackers leverage hundreds of thousands of machines and send traffic to a target. In this case, to your server. As it starts, people start to have problems with the web server. Pages will load erratically, customers will experience slowness and the server may start to reboot itself or lock up entirely. However, it doesn't stop there. The attackers often don't know when they're successful, and the traffic just keeps coming. Soon, your Internet connection will fill up and stop responding. If you're hosting offsite, the line usage may spike and drive you into over-utilization charges. Thus, in addition to losing potential sales for every minute you're down, you may also be charged for the experience.

So, it sucks to be you, but what does the attacker gain? In the old days (you know, when the hills only went up), this was done out of spite. Someone had taken offense at something you or your company had done, and their solution was to make your life miserable. These days, it's different.

These days, the attacker may be a competitor or someone hired by a competitor. They may be starting a campaign and want you out of the picture during the process. They may be trying to take one of your biggest clients and want to show that you're unreliable. It may be a criminal organization using such an attack to hide a second, more subtle attack. It may be an employee that simply wants a day off.

In any of these cases, what are you going to do about it?

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• Small Business Defense – Detect, Avoid, Leverage Business Relationships (0)
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• Security Lessons from Nature – Prairie Dogs (0)

There are some plants that bloom several times a year, some that bloom every year and some that bloom every few years. However, there are also a few types of plants that bloom every few decades. This is generally viewed as a fairly big deal, and botanists get all excited and talk to bored people at parties^* for hours on end about how special and wonderful it was, and how happy they are to have finally seen such a thing. Unless you're a botanist, you probably wouldn't care much.

^* At least, at the sorts of parties that over-excitable botanists get invited to.

That is, unless you happened to live in Asia and the plant happened to be bamboo. Unlike the American century plant, of which individual members bloom every few decades and then die, bamboo has learned to do synchronized blooming. Now, as scary as it is when a bunch of people start synchronizing their swimming, it's far worse when bamboo does it.

Granted, it's not the bamboo so much as the rats.

When the bamboo blooms, it pollinates and then produces fruits and seeds. Suddenly, there's a lot of food around and rats appear to devour all the bamboo fruits. In the process they, of course, tend to make more rats. So, for the course of a year or two, there are more and more bamboo fruits which result in more and more rats. This is all well and good until the bamboo suddenly all wise up and think "Wait a minute, what are we doing here? Rats are eating us!" and promptly go back to being placid grasses.

This leaves hundreds of rats, thousands of rats, millions and billions and trillions of rats... and no lovely little bamboo fruits to eat. Being more intelligent than the bamboo (and lacking the "hey, let's all be grass again" gene), the rats promptly turn around and start eating everything else that they can.

In Mizoram, a state of India, this means eating the people's crops. It means that the farmers who, for a generation or more have been easily able to feed their families and export enough to make a reasonable living are suddenly transformed into fighters that must defend their livelihood against a rampaging horde of rats. And really, there's not a lot they can do about it. A farmer may take on a rat and win, but one farmer versus one thousand rats is much less of a sure thing.

Similarly, you may be able to defend your business against an attacker or two, but when those few attackers suddenly become a coordinated attack from thousands to millions of computers, you're pretty much not going to win.

Distributed Denial Of Service (DDOS) attacks mostly target larger companies, but as bot nets become more affordable, the likelihood of an attack targeting you goes up. We'll look at this in more detail tomorrow.

For now, just consider the problem facing the farmers Mizoram, and think that we don't even know what diseases these rats might be carrying.

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• Small Business Defense – Detect, Avoid, Leverage Business Relationships (0)
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Most people these days know at least part of the tale of Medusa. You know that she had snakes for hair and that everything she looked at turned to stone. Well, unless you're big into gender theory, you can ignore the rest (at least for the purposes of this post), because today we're going to talk about stone.

Throughout myth, stone is often viewed as unchangable.  Even in this modern day, we have phrases like "etched in stone" and stories of the weeping angels.  Despite the obvious fact that it's not true, we tend to think of stone as permanent.  After all, making it otherwise requires special tools and/or special skill.  In everyday experience, something that is made of stone is going to stay that way forever.

If only there were a way to apply the same concept to business security.

Granted, in many cases, you wouldn't want this.  Security should be reactive and responsive. As stable as stone may be, very few people would call it highly responsive.  (Amusingly, as I write this, reports of the eruptions of Redoubt and Tonga are just coming in.)  However, it would be nice if you could effectively lock certain changes into stone, rendering them immutable.

Well, you can.  Most systems have access rights that can be tuned.  If you configure them correctly, only the right people will be able to write to those files.  In effect, it's like the computer has a special Medusa inside it that can turn files into stone for most people.  This is a basic aspect of system hardening.  If an attacker cannot write to a file, they can't make changes, and you're better off.

Ah, but what if you're one of those Greek heros for whom the computer's Medusa doesn't work?  Shouldn't you have the ability to ask Medusa to lock your files so that even you can't change them?

Well, once again, you can do this.  Most Linux systems have what are called extended file permissions that, strangely enough, are generally only used by attackers.  In addition to the basic read/write/execute (in this case, "execute" means "run", not "stalk with mirrored shield, cut off head and cause the birthing of the pegasus"), you get special magic powers such as:

• Make immutable
• Make undeletable
• Make appendable-only

Thus, you can create a configuration that is readable and works just fine, but is completely unchangable unless you are the admin of the server and you know the extra level of protection.  Now, it's not a panacea by any means, but one more layer of protection keeps out one more class of attacks. . .  and that's a win.

• Basic Permissions: chown, chmod
• Extended Permissions: chattr, lsattr
• Windows Access Control Lists: SetACL
• WORM Drives

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