Category Archives: Embedded Systems

Reverse Engineering Firmware: Linksys WAG120N – /dev/ttyS0

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The ability to analyze a firmware image and extract data from it is extremely useful. It can allow you to analyze an embedded device for bugs, vulnerabilities, or GPL violations without ever having access to the device. In this tutorial, we’ll be examining the firmware update file for the Linksys… Continue reading →

Serial File Uploads With Serio – /dev/ttyS0

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So you’ve got an embedded device that’s running Linux, you’ve tapped into the board’s serial port and you have a root shell. You’re poking around and want to run netstat/netcat/grep/whatever – but it’s not installed! And what’s worse, the device doesn’t have any utilities to perform a network file transfer…. Continue reading →