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Imagine if cell phones were infected with these bots. Already we are seeing cell phones become infected with experimental viruses, propagating through text messages and Bluetooth. If a botnet were to be amassed, the hacker would have millions of cell phones at his or her disposal. Imagine now if all of those cell phones placed a call at the same time to the same destination. That portion of the network would be out of service for an undetermined amount of time. Even if the bots were instructed to do something as simple as send a text message to a cell phone, the end result would be a lengthy denial of service for that portion of the network. It has already been demonstrated that just a few text messages could be sent to a single cell site resulting in a lengthy outage. Millions of phones sending messages to many phones in a sustained attack could easily cause an entire network to quickly crash. The effects of such an attack would be crippling. Not only would the operator lose substantial revenues, they would also lose the faith of the subscribers. Of course, if the attack were held in conjunction with a physical attack, the results would be especially devastating. Fortunately law enforcement agencies have been diligently searching for botnets and have successfully stopped many of them, but they continue to proliferate. It has become more important than ever to prevent unauthorized attacks on your networks and protect the resources from being compromised.
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Security remains one of the biggest issues in packet communications today. When one looks at the many security breaches and network attacks to date, security was seriously lacking. We already talked about one specific case where the perpetrator was able to hack into thousands of computers where even the simplest of security measures (changing the password) had not been practiced. Security can be very robust and sophisticated, and it can be very simple. Don t be fooled into thinking that highly complex and sophisticated security measures will prevent attacks on your network. Some of the world s most secure networks have been breached. However, this is no excuse for not implementing any security at all. When you look at the makeup of network attacks, there are basically two types of attackers: one that is looking for the easiest networks to breach (little to no security) and one who seeks out those with very high security (the challenge). Why, you might ask Think about those networks with very high security. There is usually something there worth stealing; otherwise, there wouldn t be so much security. If there is something of value to the hacker, then the hacker will attempt to break in. There is also the concept of a challenge. There are many who just want to be able to say they were able to do it as a personal challenge. So what does this mean for the average network operator This means you certainly have something worth stealing, so you definitely need to protect it. But you need not
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spend a fortune doing so, since we already know that the best security available is still breachable. You should take some basic measures at the very least to prevent being attacked just because your network is so easy. Know that the more security you put into place, the least likely a hacker is going to choose your network unless there is something specific they want from your network. It s the same concept used in physical security. For example, when putting an alarm system in a home or business, simply placing signs and stickers at every entry point identifying your home as alarmed is usually enough to keep most burglars away. Why They know your home is going to be more difficult (not impossible) and they can find another house next door that will be easier to break into. This is true as long as there is nothing inside they are looking for specifically (again, if you have something they want, they are going to try and get it). Thieves look for the easiest way that takes the least effort, so keep this in mind when securing the network. Making it difficult for the thief but somewhat non-intrusive to the subscriber is the difficult balance. There should be as much transparent security as possible so that the users of your services are not impacted (there is nothing worse than having to enter a password three or four times to access a service). There are many ways to implement security. Many operators have implemented session border controllers as firewalls to their network. While this is probably a good practice, thinking this will stop network attacks is dangerous. Many recent reports have proven that the majority of attacks come from within the network itself, as well as outside the network. This means that robust internal security must be implemented as well as border security to prevent the network from being compromised. Also bear in mind that attackers are now well-funded and highly educated individuals with the backing of highly sophisticated organizations. Organized crime and terrorist cells are the most common attackers today, and it then becomes necessary to build a security plan with this in mind. We are no longer fighting the teenager with nothing to do but hack computers. We are now talking about older individuals who pursue this for a living and do nothing more than break into networks for pay. The most basic concept in network security is maintaining a trusted domain. This means that all interconnections are made with entities that are known and can be trusted to send legitimate traffic. In security terms, the trusted domain is often referred to as the realm. A realm can be considered analogous to the trusted domain. It is identified in security parameters within SIP using the domain name of the trusted domain. Everything within the realm is known by the network, meaning it knows the subscribers within its own control and has authenticated all users. Anything outside of the realm is not to be trusted and should be authenticated prior to authorizing services. This is similar to the concept used in GSM networks, where a cell phone device must first register with the network and exchange credentials. Without proper credentials, the device is denied access to the network.
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