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Figure 4-2. RADIUS and RADIUS proxy authentication services Shiva Access Manager and Cisco Secure ACS are examples of products that support both the RADIUS and TACACS+ protocols. Telecommunications Hacking Telecommunications systems provide internal phone services for many organizations. These private telecommunications systems are known as PBX systems. They usually offer a variety of features such as voice mail, multiple-party calling, long-distance access restrictions, and call tracking. PBX systems are potential targets for attackers. Attackers who gain unauthorized access to the PBX system could potentially use it to do the following: Make free long-distance calls by changing billing records.
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Compromise or shut down the organization's voice mail system.
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Reroute incoming, transferred, or outgoing calls.
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Compromise the rest of your organization's network, as PBX systems are part of your network infrastructure. For example, locate a modem-equipped PC. Use that PC to create an analog connection to the internal network, and then use the analog connection to access the internal network.
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PBX systems are frequently an organization's most valuable communication asset. If the PBX system is compromised, the organization could lose business. There are relatively few brands of PBX systems available, so an attacker could use knowledge of a few select systems to compromise a wide variety of businesses. Although PBX systems are complex, a skilled attacker could use the system to compromise your network infrastructure. There are a variety of methods that an attacker might use to compromise the PBX system: PBX systems come with default passwords for system maintenance. Attackers could run password attacks to guess these PBX maintenance passwords. Once an attacker acquires a management password, he or she can reconfigure the PBX system.
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PBX systems are often expensive and upgrades are difficult. Therefore, many businesses use older PBX systems that might have unencrypted databases with obvious data structures that could be manipulated.
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PBX security is not as popular a topic as computer security. Many businesses don't think to protect their PBX systems or know how to do so. Users might be tricked into giving up passwords for the telephone system because awareness of exploitation is not as high as it is with computer systems.
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Remote management and upgrades of PBX systems are commonplace. Remote connections could be used to install malicious software or reconfigure the PBX system.
Many people use and have access to the PBX-connected telephones. These terminals could be used to attack or reconfigure the PBX system.
Telecommunications infrastructure might extend into unused floors and offices, making it easier for someone to hide an unauthorized connection (or conceal hacking attempts). Protecting Your PBX
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Physically securing PBX equipment should be a high priority. Ensure that access to the main PBX wiring room and switching equipment is controlled. The telecommunications infrastructure should be carefully documented and routinely checked for unauthorized connections. Other items to consider when protecting your PBX system are as follows: Shut down or secure off-site transfers with passwords. Off-site transfers are typically enabled so that the vendor or a contracted service provider can update your PBX automatically. Attackers could exploit this system to reconfigure your PBX.
Program system exclusion lists to limit long-distance calling. Consider blocking 900 numbers and other toll numbers.
Program system schedules to shut down services that are not required during off hours and days.
Educate users about PBX security. Ask users not to write down passwords or program their phones with passwords in auto-dial. Tell users to clear phones that display dialed numbers after resetting passwords (so their password is not stored in the redial feature of the phone).
Enforce a PBX password change and audit policy. Ensure that passwords are not left at default values and that they are routinely changed.
Audit PBX access to ensure that former employees, partners, and contractors who no longer need access are removed from the system.
Secure maintenance ports and limit the number of entry points. Disable unnecessary remote management features. Implement the highest available security features for maintenance and remote management.
Routinely check for vendor software and hardware updates, and verify all software updates to the PBX system.
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