Hacking the lobby telephone
WASHINGTON--Two security researchers at ShmooCon demonstrated on Saturday how a laptop connected to a VoIP telephone could, in some cases, expose a business' internal network to outsiders.
John Kindervag, senior security architect for Vigilar, said that public waiting areas in hospitals, conference rooms, and hotel rooms are particularly vulnerable to this attack since often there is no IT staff around. Appearing on stage at the East Coast computer hacker conference with Kindervag was Jason Ostrom, manager of Vigilar's Vulnerability Assessment and Compliance Practice team, who used the ShmooCon conference to show off his latest version of VoIP Hopper, a tool he uses for penetration testing of companies that are running voice over IP phone systems.
Kindervag said that VoIP was gaining acceptance with large companies and organizations for many reasons: there are no toll calls over the Internet; there's less cabling involved; employees can move offices without having to rewire or change switching operations for their phones; and finally, voice mail notices can appear in one's Outlook inbox. "This is very popular among CIOs," Kindervag said.
But Ostrom's tool allows one to hook up a laptop computer to a public VoIP phone and connect to the company's or organization's internal network with full administrator access. VoIP Hopper can be used to intercept Cisco Discovery Protocol (CDP), which announces the device type and the SNMP agent address of neighboring devices, and automatically create a new ethernet device. This could allow someone to map or otherwise do damage to a company's network from a public waiting area. The tool also allows one to physically remove the phone and have a laptop spoof the phone's MAC address, so the network is unaware that a laptop has replaced the expected phone.
To prevent such attacks, the researchers recommend turning off CDP. They also recommend disabling port 2 on any public VoIP phone, and include the public phone within a firewall.
As CNET's resident security expert, Robert Vamosi has been interviewed on the BBC, CNN, MSNBC, and other outlets to share his knowledge about the latest online threats and to offer advice on personal and corporate security. Listen to his podcast at securitybites.cnet.com or e-mail Robert with your questions and comments. 
Their discovery protocol offers hackers a way to potentially infiltrate a corporate LAN from outside of the typical security ring.