Holes in Embedded Devices: Authentication bypass (pt 3)

We move on with the 3rd kind of authentication bypass bug. You may want to familiarize yourself with the previous two entries here and here, before you continue.

Unchecked HTTP methods

A device that is vulnerable to this issue, only performs an authentication check (i.e.: is the password being submitted with a request via basic authentication?) when the request is performed using a certain HTTP method. [...]

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Holes in Embedded Devices: Authentication bypass (pt 2)

Usually, when accessing a web interface of an appliance, the user is prompted to enter a password if not authenticated already. This could be done via a HTML form on the login page or a basic HTTP authentication prompt (among other methods).

Let’s call the authentication stage: A. Once, the admin user enters a username/password combination, the device checks the provided combination against credentials stored in its internal configuration. [...]

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Holes in Embedded Devices: Authentication bypass (pt 1)

Finding authentication bypass bugs is an obvious choice for attackers, since such bugs allow administrative changes to be made without knowledge of the admin password. In other words, compromising the target device without requiring a password is of course something attackers are interested in! You bet! [...]

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