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In a well-configured network, unauthorized modems are often an overlooked vulnerability. These unauthorized modems provide a means to bypass most or all of the security measures in place. There are several software packages available (see Appendix C) that allow attackers and network administrators to dial large blocks of phone numbers in search of available modems. This process is called war dialing. A computer with four modems can dial 10,000 numbers in a matter of days. Certain war dialers will even attempt some limited automatic hacking when a modem is discovered.
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