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3 Make analog lines harder to find don t put them in the same range as the corporate numbers, and don t give out the phone numbers on the InterNIC registration for your domain name Password-protect phone company account information 4 Verify that telecommunications equipment closets are physically secure many companies keep lines in unlocked closets in publicly exposed areas 5 Regularly monitor existing log features within your dial-up software Look for failed login attempts, late night activity, and unusual usage patterns Use CallerID to store all incoming phone numbers 6 Important and easy! For lines that are serving a business purpose, disable any banner information presented upon connect, replacing it with the most inscrutable login prompt you can think up Also consider posting a warning that threatens prosecution for unauthorized use 7 Require two-factor authentication systems for all remote access Two-factor authentication requires users to produce two credentials in order to obtain access to the system something they have and something they know One example is the SecurID one-time password tokens available from Security Dynamics Technologies, Inc Okay, we know this is often logistically or financially impractical However, there is no other mechanism that will virtually eliminate most of the problems we ve covered so far See the Summary at the end of this chapter for some other companies that offer such products Failing this, a strict policy of password complexity must be enforced 8 Require dial-back authentication Dial-back means that the remote access system is configured to hang up on any caller and then immediately connect to a predetermined number (where the original caller is presumably located) For better security, use a separate modem pool for the dial-back capability, and deny inbound access to those modems (using the modem hardware or the phone system itself) This is also one of those impractical solutions, especially for many modern companies with tons of mobile users 9 Ensure that the corporate help desk is aware of the sensitivity of giving out or resetting remote access credentials All the preceding security measures can be negated by one eager new hire in the corporate support division 10 Centralize the provisioning of dial-up connectivity from faxes to voicemail systems within one security-aware department in your organization 11 Establish firm policies for the workings of this central division, such that provisioning a POTS (plain old telephone service) line requires nothing less than an act of God or the CEO, whichever comes first For those who can justify it, use the corporate phone switch to restrict inbound dialing on that line if all
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they need it for is outbound faxing or access to BBS systems, and so on Get management buy-in on this policy, and make sure they have the teeth to enforce it Otherwise, go back to step 1 and show them how many holes a simple war-dialing exercise will dig up 12 Go back to step 1 Elegantly worded policies are great, but the only way to be sure that someone isn t circumventing them is to war-dial on a regular basis We recommend at least every six months for firms with 10,000 phone lines or more, but it wouldn t hurt to do it more often than that See Kicking the dial-up habit is as easy as our 12-step plan Of course, some of these steps are quite difficult to implement, but we think paranoia is justified Our combined years of experience in assessing security at large corporations has taught us that most companies are well-protected by their Internet firewalls; inevitably, however, they all have glaring, trivially navigated POTS dial-up holes that lead right to the heart of their IT infrastructure We ll say it again: going to war with your modems may be the single most important step toward improving the security of your network
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