Manipulating VoIP security

Packet flooding can cause various forms of Denial of Service (DoS) -- the endpoints don't work, the network is overloaded, phones are disconnected and other malicious acts occur. Signaling manipulation can cause calls to be directed to other locations, add a second listener to the call, create a rogue call manager and force phones to reboot. Another good presentation on VoIP attacks is VoIP Attacks! by Dustin Trammell presented at ToorCon 2006.

How to use this information (disclaimer)

Any tools that attack an enterprise's security will probably cause damage to the operation of VoIP if the tools are used improperly. The links listed below usually have instructions covering the proper use of the tool. Even following the instructions may not eliminate damage or harm. The links are to other sites and are not part of TechTarget, so there is no guarantee that everything will work as expected. The links are for information purposes only.

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imer is out of the way, this list contains free tools. There are many other free and commercial tools on the market that are used by developers that also can be used to attack VoIP components. This tool list is not exhaustive. The primary source for the tool list is VoIPSA from the VoIP Security Alliance. Several of these tools were developed by David Endler and Mark Collier, the authors of Hacking VoIP Exposed.

Packet creation and flooding tools

Signaling manipulation tools

These three tips cover many of the forms of attacks and malicious behavior that have so far been created. There are also scanning, enumeration and miscellaneous tools as well as commercial development tools that are available. As VoIP becomes more pervasive and the number of individuals using VoIP increases, so will the attack tools. Keep checking the sites mentioned in these tips for further additions to the attack tools list.

About the author:
Gary Audin has more than 40 years of computer, communications and security experience. He has planned, designed, specified, implemented and operated data, LAN and telephone networks. These have included local area, national and international networks, as well as VoIP and IP convergent networks, in the U.S., Canada, Europe, Australia and Asia.

Related links:
Ask the expert: What security practices should I keep in mind when designing my VoIP network?

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