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DNS (Domain Name Service) is one of the most basic services on the Internet.If you want to effectively set up TCP/IP on your network, you’ll probably need to install a DNS server at some point. In this Daily Drill Down, I’ll take a brief look at DNS and show you some of its ins and outs.In order for Reverse Tethering to be able to share your computer's Internet connection with your Android device, you have to run the Reverse Tethering Server application on your computer.The application is distributed in three versions: One is for mac OS, one for Windows, and one for Linux.If we look back in the call tree, we see that the http_request_t structure pointer is passed around by a few functions: It turns out that the pointer at offset 0x D0 in the http_request_t structure is populated by the httpd_parse_request function: In other words, if your browser’s user agent string is “xmlset_roodkcableoj28840ybtide” (no quotes), you can access the web interface without any authentication and view/change the device settings (a DI-524UP is shown, as I don’t have a DIR-100 and the DI-524UP uses the same firmware): You stay classy, D-Link.UPDATE: The ever neighborly Travis Goodspeed pointed out that this backdoor is used by the /bin/xmlsetc binary in the D-Link firmware.
The application comes as portable program that can be executed from any directory and does not have to be installed.
They were even thoughtful enough to prepend many of their custom function names with the string “alpha”: We can see that alpha_auth_check is passed one argument (whatever is stored in register $s2); if alpha_auth_check returns -1 (0x FFFFFFFF), the code jumps to the end of alpha_httpd_parse_request, otherwise it continues processing the request.