The personal blog of Lukas Reschke
In my years working in application security teams for leading tech companies such as Facebook, I have identified several recurring patterns that challenge the effectiveness of cybersecurity measures in European software companies. In this blog post I will provide some of the bad patterns that I have seen over the recent years, and where I […]
Recently I took a look at Atom, a text editor by GitHub. With a little bit of work, I was able to chain multiple vulnerabilities in Atom into an actual Remote Code Execution. The vulnerabilities have been fixed in the 1.21.1 release on October 12th, 2017 after I reported it via their HackerOne program. In case you want to […]
At Nextcloud we do employ a pretty strict Content-Security-Policy (CSP). In case you need a quick explanation what CSP is, I’d suggest reading this older blog post of mine. One of the caveats with the implementation in Nextcloud is that we had to allow 'unsafe-eval' because of our historically grown code base. For example, we use handlebars.js for […]
In the past, the update experiences with ownCloud have been difficult. It was not always clear when updates would be released for the updater app or how to move to a new major release. Apps disappeared after an update or apps were updated to an incompatible version (e.g. with a broken PHP dependency), or simply […]
As you may have read in the official Nextcloud announcement we’re today releasing the Nextcloud 10 beta release. Besides adding a lot of awesome new features it also includes several security hardenings, such as adding support for a native bruteforce protection and Two-Factor Authentication. Nextcloud commits to keeping your data secure, we’re even going so far to […]
It is a well-known fact that I’m a vocal supporter of Bug Bounty programs. I do believe that running a fair and engaging bug bounty program is a great addition to any software security process. My personal experiences with Bug Bounties go back to the end of 2011 where somebody made me aware of the […]
We’re constantly working on adding more security features and hardenings to Nextcloud, after all it’s your data and it has to be protected properly. While the Nextcloud 9 release fixes a critical security issue (we have informed upstream about this but in the meanwhile recommend upgrading as soon as possible) it also adds another new […]
I have been a contributor to the ownCloud project since the beginning of 2012. Starting as a volunteer my contributions were small. I joined the IRC channel, helped people out there and only over time I did start working with the code base more deeply. The community aspect has always been my main fascination. Seeing people from […]
If you ever have run a Linux-based operating system you are probably aware of the way that software is usually distributed on them: Using a software repository. Repositories are great for numerous reasons. Want to install an application on Debian? Easy. Just execute apt-get install ffmpeg and ffmpeg has been installed. Updating? A quick apt-get update plus apt-get upgrade and all is […]
This post tries to prove that vulnerabilities can in fact be very subtle and that even people who master their toolkit and libraries can easily fall for them. It is based upon a vulnerability in ownCloud server fixed in June 2015. cURL is probably known to most readers of this blog. If not: It is a library […]