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A way to look at the telephony world would be to see each phone and the person who answers it as a user, making each extension a username We take this perspective because phones are often used as an identifying mechanism (think of caller ID) In the same way a person is held accountable for the activities of their username on a computer, they can be equally accountable for their extension or phone number Extensions and phone numbers are even more so usernames because they are used to access privileged information (that is, voicemail) These commonly 4 6 digit values are used as one half of the authentication credentials, the other half being a 4 6 digit PIN Hopefully, you are starting to see (if you weren t already) how extensions are valuable pieces of information Now let s look at enumerating them Besides the traditional manual and automated war-dialing methods mentioned earlier in this chapter, VoIP extensions can be enumerated with ease just by observing a server s response Remember, SIP is a human readable request/response based protocol, which makes it trivial to analyze traffic and interact with the server SIP gateways all follow the same basic specifications but this doesn t mean they are all written the same way We ll see that when dealing with Asterisk and SIP EXpress Router (two open source SIP gateways), that they both have their own little nuances to give up information in subtle ways

label Defines a label for the list item value The string returned to the server when a user selects the item

Below we have two sample REGISTER requests to an Asterisk SIP gateway The first request shows client and server communication when attempting to register a valid user, while the second shows the same for an invalid user Let s see what kind of information Asterisk will provide us

The <option> element can also receive a number of events We will examine all the predefined HTML event handlers in more detail in 9

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One variation of the text box is the text area The text area control accepts multiple lines of input and is defined using the HTML <textarea> element One drawback of the text area control is that you cannot easily restrict the amount of data a user adds to that control The most common attributes for the <textarea> element are rows, cols (columns), and name As you would expect, you specify the height of the control using the rows attribute, and the width of the control using the cols attribute For example, the following text area will hold 5 rows that are 60 characters wide

Valid User REGISTER Messages Request (Client) REGISTER sip:102191120 SIP/20 Via: SIP/20/UDP 102191209:60402;branch=z9hG4bK-d875437f079d2614297a3c-1--d87543-;rport Max-Forwards: 70 Contact: <sip:1235@102191209:60402;rinstance=d4b72e66720aaa3c> To: <sip:1235@102191120> From: <sip:1235@102191120>;tag=253bea4e Call-ID: NjUxZWQwMzU3NTdkNmE1MzFjN2Y5MzZjODVlODExNWM CSeq: 1 REGISTER Expires: 3600 Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, INFO User-Agent: X-Lite release 1011s stamp 41150 Content-Length: 0 Response (SIP Gateway) SIP/20 401 Unauthorized Via: SIP/20/UDP 102191209:60402;branch=z9hG4bK-d875437f079d2614297a3c-1--d87543-;received=102191209;rport=60402 From: <sip:1235@102191120>;tag=253bea4e To: <sip:1235@102191120>;tag=as2a195a0e Call-ID: NjUxZWQwMzU3NTdkNmE1MzFjN2Y5MzZjODVlODExNWM CSeq: 1 REGISTER User-Agent: Asterisk PBX Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY WWW-Authenticate: Digest algorithm=MD5, realm="asterisk', nonce="3aa1f109" Content-Length: 0 We see that when making a REGISTER request to the Asterisk server using a valid username but without authenticating, the server responds with a SIP/20 401 Unauthorized This is all fine and dandy as later on, when the user correctly responds to the digest authentication request, they ll receive a 200 OK success message and be registered with the gateway Also, notice the User-Agent field in the response, just like HTTP, gives us the type of server running on the SIP gateway Now let s look at what happens when a client makes a REGISTER request with an invalid username

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Invalid User REGISTER Messages Request (Client) REGISTER sip:102191120 SIP/20 Via: SIP/20/UDP 102191209:29578;branch=z9hG4bK-d87543d2118f152c6dde3a-1--d87543-;rport Max-Forwards: 70 Contact: <sip:1205@102191209:29578;rinstance=513eb8a7e958 7e66> To: <sip:1205@102191120> From: <sip:1205@102191120>;tag=4f5c5649 Call-ID: N2NmNDEwYWE3Njg2MjZmYjY3YzU3YjVlYjBhNmUzOWQ CSeq: 1 REGISTER Expires: 3600 Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, INFO User-Agent: X-Lite release 1011s stamp 41150 Content-Length: 0 Response (SIP Gateway) SIP/20 403 Forbidden Via: SIP/20/UDP 102191209:29578;branch=z9hG4bK-d87543d2118f152c6dde3a-1--d87543-;received=102191209;rport=29578 From: <sip:1205@102191120>;tag=4f5c5649 To: <sip:1205@102191120>;tag=as29903dcb Call-ID: N2NmNDEwYWE3Njg2MjZmYjY3YzU3YjVlYjBhNmUzOWQ CSeq: 1 REGISTER User-Agent: Asterisk PBX Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY Content-Length: 0 As maybe some of you suspected, the server responded differently (SIP/20 403 Forbidden) to a REGISTER request for an invalid user This is important because the server s behavior changes when receiving requests for invalid/valid users, meaning we can systematically probe the server for guessed usernames, and then build a list of valid guesses identified by the server response Voila! User enumeration!

Unlike other controls, push buttons (or just buttons) are generally not used to provide user input Their purpose is to cause the browser to execute some JavaScript code through the button s onclick event handler There is a special type of push button control called a submit button that can be used to provide user input We will examine submit buttons in the next section

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