HACKvent 2017 write-up


Like every year before Christmas the HACKvent is on! It is a Jeopardy CTF competition in the style of an advent calendar. Every day at 00:00 a new challenge is released. It starts with easy ones and then becomes harder and harder. If you solve a challenge before the next one is released, you’ll get full points. Oh boy, the last couple of days were stressful…

Unfortunately I lost 1 point because I wasn’t able to submit the tamagotchi challenge on time. It was even more frustrating when I’ve found out, that it didn’t work because of a copy/paste error.

Nevertheless, I am very happy with the result as I still managed to finish on the 8th place! 🙂

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Sudo insult mode

Insult mode is a funny sudo feature:  Whenever you enter a wrong password sudo insults you.

For enabling the insult mode open the /etc/sudoers file as root and type “insults” at the end of the ‘Defaults’ line. The tags in the ‘Defaults’ line are comma separated. If there is no ‘Defaults’ in your config just write “Defaults insults” to your /etc/sudoers.

Just enter a wrong password when using sudo and see what happens.

Gnome 3 – Change the message notification duration

Recently at work I updated my box to Ubuntu 11.04. I really couldn’t handle Unity – so I installed Gnome 3… It took some time but now I like it.

I have pidgin installed and every chat message I get shows me a Gnome message notification for a couple of seconds. A nice, useful helper I would say. But I’m at work and some friends of mine have the terrible habit to write a new message for every single word they use. 🙂 When someone is starring at your screen at this time it’s quite uncomfortable…

After googling a bit I couldn’t find any solution to change the duration time of the notification. So I’ve found a solution on my own. I tested this on Ubuntu 11.04 and on my Arch Linux computer at home. Continue reading