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VoIP security threats

As VoIP becomes increasingly prevalent, so do the threats aimed at subverting its security. After all, letters IP in VoIP stand for Internet Protocol and that means attackers have a ready-made bag of tricks to pick from. How much do you know about the threats to VoIP security? Take our quiz to find out.

1. The most serious threat to VoIP security is the old-fashioned __________ attack, in which users are deprived of connectivity or other resources they would normally expect to have.
What is it?

2. This protocol allows the destination receiver to compensate for delay jitter caused by packet loss. An attacker can use it to disrupt calls by interjecting sounds into a VoIP call.
What is it?

3. This is a service that allows a caller to masquerade as someone else by falsifying the number that appears on the recipient's caller ID display. An attacker can use it to make a VoIP call appear to come from a trusted source.
What is it?

4. This type of packet is normally sent when a participant in a multicast event leaves the session. In a session tear-down attack, an attacker uses it to suddenly terminate a VoIP call.
a. BYE packet
b. CYA packet
What is it?

5. Because some VoIP products don't support encryption, they make this type of unauthorized listening relatively easy.
a. monitoring
b. eavesdropping
What is it?

6. Beware! If you get a computerized voice message asking you to call your bank because there's been suspicious activity in your checking account, be sure to look up your bank's phone number and not rely on the phone number left in the message. What type of attack could this message be?
Answer

7. In August 2009, Symantec issued a security bulletin about Trojan.Peskyspy. What VoIP service provider did Trojan.Peskyspy target?
a. Windows Live
b. Skype
c. Google
d. Yahoo
Answer

8. Once the bane of the traditional telco, phreaks are now exploiting VoIP vulnerabilities. What do phreaks do?
Answer

9. This is the Internet protocol for initiating interactive user sessions. VoIP attackers use it to intercept calls by transferring register requests to the attacker's IP address instead of the legitimate recipient's.
What is it?

10. If SPIT becomes as rampant as spam, it could render enterprise VoIP systems unusable. What does SPIT stand for?
Answer

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This was last updated in September 2009
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