Introduction Last week, I came across a piece of firmware that I was particularly curious about. As with typical analysis on such an image, I extracted the squashfs root using binwalk and found the web service, httpd, that I was targeting. A smile spread across my face as I typed a command into the terminal to run httpd in QEMU user mode, but after pressing the “Enter” key, I saw it: $ sudo chroot . ./qemu-armeb-static /usr/sbin/httpd -n cannot open /dev/nvram Cannot open /dev/nvram. This...
