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hxp CTF: shitty blog

Read more writeups at Challenge description: Please use my shitty blog 🤎! We are given a docker container running php. The only notable things about it, is that there is a readflag binary on the server and that the webroot is /var/www/html. Other than that only index.php is interesting: <?php // TODO: fully implement multi-user / guest feature :( $secret = 'SECRET_PLACEHOLDER'; $salt = '$6$'.substr(hash_hmac('md5', $_SERVER['REMOTE_ADDR'], $secret), 16).'$'; if(! isset($_COOKIE['session'])){ $id = random_int(1, PHP_INT_MAX); $mac = substr(crypt(hash_hmac('md5', $id, $secret, true), $salt), 20); } else { $session = explode('|', $_COOKIE['session']); if( ! CTF 2021 Writeups

Tenbagger #Challenge description: I think I took it too far and made some trades and lost everything. My only chance to fix my account balance is a tenbagger. We are given a pcap and open in Wireshark. It contains a lot of what looks like normal web browsing. But somewhere in there are a few FIX messages. FIX is the Financial Information eXchange protocol. First, I thought that we need to get the credentials from the FIX login, but there are no such packages.

ASIS CTF 2021 Writeups

These are writeups for the first CTF I participated in during a weekend. Before that I only solved some picoctf and Google Beginners quest challenges after the events. I played with KITCTF the CTF team of the Karlsruhe Institute of Technology. Factory #Challenge description In the simplest terms, factory misco-graphy is the ratio of output to input! The challenge file is only one pdf. Opening the only shows the text “Real-World Misco-graphy”.