Banner Grabbing

Popularity:

10

Simplicity:

10

Impact:

2

Risk Rating:

7

A successful wardialing attack gathers information about the targeted system. The banners displayed when connecting to the answering modems can help attackers identify the OS connected to the PSTN, ISDN, or X.25 network. Information about the OS can help them identify default usernames and passwords.

In many cases, an attacker finds a generic banner, but in some cases, he or she finds a specific banner, containing the company's name, location, network/service name, or even node name. In other cases, banners might indicate the help desk phone number as well as a contact name in the IT department. Attackers can use all of this information to narrow the focus of any brute-force password/login attack.

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