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Dial-Up, PBX, Voicemail, and VPN Hacking
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Popularity: Simplicity: Impact: Risk Rating: 5 5 8 6
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If you come across a prompt/system that looks like this, take a peek and leave, since you will more than likely not be able to defeat the mechanism used to protect it It uses a challenge response system that requires the use of a token
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XX-Feb-XX 02:04:56 *91XXX5551234 C: CONNECT 9600/ARQ/V32/LAPM Hello Password : 89324123 : Hello Password : 65872901 :
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U PBX Hacking Countermeasure be sure to reduce the time you keep the modem As with the dial-up countermeasures,
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turned on, deploy multiple forms of authentication, for example, two-way authentication (if possible), and always employ some sort of lockout on failed attempts
Brute Force Voicemail Hacking
Popularity: Simplicity: Impact: Risk Rating: 2 8 9 6
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Two programs that attempt to hack voicemail systems were written in the early 1990s: Voicemail Box Hacker 30 and VrACK 051 We tried to use these tools in the past; they were primarily written for much older and less secure voicemail systems The Voicemail Box Hacker program would only allow for testing of voicemails with four-digit passwords, and it is not expandable in the versions we have worked with The program VrACK has some interesting features; however, it is difficult to script, was written for older x86 architecture based machines, and is somewhat unstable in newer environments Both programs were probably not supported further due to the relative unpopularity of trying to hack voicemail; hence updates were never continued Hacking voicemail leads us to using our trusty ASPECT scripting language again As with brute force hacking dial-up connections using our ASPECT scripts described earlier, voicemail boxes can be hacked in a similar fashion The primary difference is that using the brute force scripting method, the assumption bases change Essentially you are going to use the scripting method and at the same time listen for a successful hit, instead of logging and going back to see if something occurred Thus, this is an attended or manual hack, and not one for the weary but one that can work using very simple passwords and combinations of passwords that voicemail box users might choose To attempt to compromise a voicemail system either manually or by programming a brute force script (not using social engineering in this example), the necessary components are the number of the primary number to access voicemail, a target voicemail box, including the number of digits (typically three, four, or five), and an educated guess about the minimum and maximum length of the voicemail box password In most modern organizations, certain presumptions about voicemail security can usually be made These presumptions have to do with minimum and maximum password length, and default passwords to name a few A company would have to be insane not to turn on at least some minimum security; however, we have seen it happen Let s assume that there is some minimum security and that voicemail boxes of our target company do have passwords With that, let the scripting begin Our goal is to make something similar to the simple script shown next Let s first examine what we want the script to do (Code Listing 97) This is a simple example of a script that dials the voicemail box system, waits for the auto attendant to say the greeting, such as Welcome to Company X s voicemail system Mailbox number, please , puts in the voicemail box number, hits pound key to accept, and then puts in a password, hits the pound key, and tries the process one more time This example tests six passwords for voicemail box 5019 Using some ingenuity with your favorite programming language, you can easily create this repetitive script using a dictionary of numbers of your choice You ll most likely need to tweak the script, programming for modem characteristics and other potential This same script can execute nicely on one system and poorly on another Hence, listening to the script as it executes and paying close attention to the process is invaluable Once you have your test prototype down, you can use a much larger dictionary of numbers that will be discussed shortly
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