Reverse Engineering sometimes results in Remote Code Execution
I’ve always wanted to visit San Francisco! So I was really happy about an email from HackerOne inviting me to this beautiful city in April. But they did not cover all the costs for my international flights and the hotel
With the h1-212 CTF, HackerOne offered a really cool chance to win a visit to New York City to hack on some exclusive targets in a top secret location. To be honest, I’m not a CTF guy at all, but
The authors of check_mk have fixed a quite interesting vulnerability, which I have recently reported to them, called CVE-2017-14955 (sorry no fancy name here) affecting the oldstable version 1.2.8p25 and below of both check_mk and check_mk Enterprise. It’s basically about a
I usually try to avoid blogging about Cross-Site Request Forgery and Cross-Site Scripting vulnerabilities, just because they are basically everywhere – except if they can be used to achieve something cool 😉 In this specific case I have found a
I recently came across an interesting Local File Inclusion vulnerability in a private bug bounty program which I was able to upgrade to a Remote Code Execution. The interesting fact about this and what makes it different is that the
In late January, I have found and reported a Server-Side Request Forgery (SSRF) vulnerability on toolbox.googleapps.com to Google’s VRP, which could be used to discover and query internal Google DNS servers to extract all kinds of corporate information like used internal IP addresses
I’m quite busy with bug bounties lately, but sometimes I still discover stuff, which might also be interesting for the rest of you ;-). So here’s quick writeup about a quite interesting vulnerability in the open source Slack-alternative Mattermost, which I have found in December
The year 2016 comes to an end quickly and so it was time for another Sides conference. This year’s HamburgSides, formerly known as BSidesHH, was held in the Bucerius Law School in Hamburg next to the 33C3. I’ve been supporting
Have you ever been to 44CON in London? In case you haven’t, you need to go there in 2017! To be honest it was my first time attending, but it took just one 44CON for me to become excited and that not only because of
As you may have noticed, I have posted a couple of articles about my SecurityTube Linux Assembly Expert exam during the last months. Now that I have successfully completed the course, I just want to share my thoughts about it for those of you