../

FIRMWARE

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After unpacking the firmware archive, you now have a binary in which to go hunting. Its now time to walk around the firmware and see if you can find anything.

9522120f36028c8ab86a37394903b100ce90b81830cee9357113c54fd3fc84bf

The file is an image of a ext4 filesystem, that you can mount with:

# mount challenge.ext4 <mount path>

It contains the typical linux file structure and has a hidden file directly at root:

& cd mount
$ ls -la
[...]
.mediapc_backdoor_password.gz
[...]

Copy it out of the read-only filesystem and unzip it:

$ cp .mediapc_backdoor_password.gz ../
$ cd ../
$ gunzip .mediapc_backdoor_password.gz

flag: CTF{I_kn0W_tH15_Fs}