Spit Will Be Worse Than Spam

KentuckyFC writes "A team of German computer scientists has developed a program that reproduces all the known forms of spit (spam over internet telephony) attack. Their plan is to make the spitting software available to computer security experts wanting to test antispit strategies. Developing these won't be easy. There are various antispit techniques, such as white lists that allow only calls from predetermined callers, Turing tests such as audio CAPTCHAs that make a caller prove he or she is human and payment-at-risk services where the caller makes a small payment in advance and is refunded immediately if the receiver acknowledges the call as legitimate. But all have weaknesses, say the researchers. The main difference between junk calls and junk email is that the email arrives at your mail server before you access it. This gives the server time to analyze its content and filter out the junk before it gets to you. Not so with internet telephony, which is why radically different strategies are needed."

Comments

#1 question

[khasim]

Can this get to my regular phone or cell phone?

If yes, then this is a problem.

If no, then this is not that big of a problem.

If yes, but only if the spammers (spitters?) pay for cell minutes or something, then this is not a problem at all.

Re:#1 question

[Hatta]

That's called telemarketing. This isn't.

What's the difference?

This has the potential to be as bad as (or worse) than spam. Think about it - if you were telemarketing, you'd have to hire a bunch of people to work in a call center. This costs money (rent, phone lines, people).

So the difference is how many people you need to do it? Then it's just a matter of degree, and not a fundamental difference. VOIP spam is only worse than telemarketing because there's more of it.

It's like why the spam problem is worse than junk mail - sender has to invest in sending junk mail, while spam costs just bandwidth and botnet fees. It probably won't reach normal landlines since things like SkypeOut etc. cost money.

Funny thing is, I get a lot more paper spam than email spam. From where I stand, paper spam is a worse problem. It certainly kills a lot more trees. And I can't set up a filter for my paper spam.

Re:#1 question

[Sandbags]

I doubt you'll every see that level of activity. Remember, VoIP calls to a person have to be placed through a central service, and that service does NOT provide free toll charges to businesses the way it does to people.

Folks on Skype, and other non-centralized VoIP (direct IP to IP calling) may be suceptable to this, but since SSkype can't support e-911, it;s not really an issue... IP to Vonage calls, for example, in part run across telco networks, and those incur charges. The SPITers won;t be able to make good on their investment.

Besides, the Teloc netowkrs and VOIP networks would not be able to handle that volume. e-mail gets bogged down due to Spam, but calls either work or not. If this becomes an issue, the FCC will be on it lightning fast and with great ferocity. Each call is a trunk line, not a few packets...

A PC can't really just CALL a Voip line... The softphone, even for the very small percentage of people who use them as opposed to most people on VOIP havoing a hardware device, is a proprietary program, and on the back end is interfacing with an authentication system. Some random virus is not going to be able to interface with Vonage to make calls that way...

Like I said, Skype might be a hackable system, but business voip is all inter-office (VPN tunnels) not open internet calls. Businesses using VOIP use PRI or BRI trunks and traditionsal call networks to place person to person calls (except intra/inter office over secure systems). SPITing on a business extention means placing a call through a terrestrial phone company. Those can be traced, and blocked, if abused.

If SPITing was potentially that successful, I'd be getting 100 calls a day at my home line already.

Also, a Drone infrected PC that was SPITing, how many calls a day do you think it would be making? and how many calls a day (or at a TIME!) is it reasonable for a human to make? It should be easy for phone companies to identify drone VOIP machines and shut them down... Calling habbits for a household are easy to model, and since even a telemarketer working from home has to have a business class phone license, they'll be easy to identify and eliminate false positive screenings. (most home telemarketers run through VPN to a central switch anyway).

This really isn't a big deal. If they ever figure out HOW to make it a big deal, expect strict and sweeping legislation. Attacks on the US phone system are considdered terrorist activity, unlike spam which is just a civil, not even criminal, in most cases offence. Also, VoIP is easy to trace, since it;s clearly a 2 way communication requirement, unlike spam.

DDoS is a possible abuse, but even that should not effect centralized VoIP providers and their customers (100 calls in 3 minutes? block it. Done.)

Old Turing Test

[Thelasko]

Play a Special Information Tone before the phone starts to ring. Most autodialers won't waste their time and hang up. Humans will realize it's a fake tone and stay on the line. I don't know if it works with VoIP though.

Anecdote

[Thelasko]

We had a dialer call through our company last year. It was pretty interesting. All of the phones in our company are on the same trunk. You could tell the dialer was just calling every possible number on the trunk in sequence because a wave of rings went through the office (it's normally pretty quiet). Everyone discovered they had a voicemail from "the job hotline" a little while later. The Attorney General eventually caught the guy and shut him down.

It's a Scheme to Sell Spitware to End Users

[mpapet]

As someone that runs a VOIP server, I can speak from limited experience.

1. Unlike email, The offender needs a block of voip numbers to do any meaningful spitting. Those blocks aren't as costless as sending spam. Let's argue for a minute they don't need blocks. The VOIP server should not be allowed to process more than ~2 calls out per number. That's a configuration issue. On proprietary voip server software, I don't know if that's possible, but on openser it is.

2. This _should_ be the responsibility of the VOIP host, except we know that most current providers won't do it for free. It can, and should be automated. ex. *69 reports the call as spam. Even if the call is coming from a peering host, the source can be halted swiftly.

3. DB queries on call volume should identify the offender within 30 minutes anyway.

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