Inaccessible
Challenge description:
Find the flag.
The challenge gave us a file asisfor.iso that was a modified damn small linux.
![](/blog/images/asis2013/inaccessible_boot.png)
You could login with an empty password and find a file /root/secret.txt with a bunch of base64 encoded data.
If you extracted the contents of the iso, you could find that the file was written at boot time from different boot-up scripts.
After recovering the bas64 string and decoding it, it resulted in a corrupted .gif image.
![](/blog/images/asis2013/corrupted.gif)
The corrupted gif was enough to recognize most of the characters of the flag, so that we could brute force the rest from the hash given on the submission page.