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On June 5th 2018 we heard about Zip Slip: We just disclosed a widespread critical vulnerability called Zip Slip. It may affect you! Zip Slip is a widespread arbitrary file overwrite critical vulnerability, which typically results in remote command execution. It was discovered and responsibly disclosed by the Snyk Security team Coincidentally, a couple of weeks before that we heard about Zipper Down While auditing iOS Apps from various customers, Pangu Lab noticed a common programming error, which leads to severe consequences such as data overwritten and even code execution in the context of affected Apps. And then listing almost 16.000 apps that could be vulnerable. What is going on with ZIP files? Why can it lead to remote code execution and why is like affecting everything? In case of Snyk Security, seveal CVEs were assigned. It’s like a massacre. So first of all, what do these two different disclosures have in common - Zip Slip and ZipperDown. So when ZipperDown was made public, they wrote that “To avoid leaking the details of the programming error, we named it ZipperDown.”. So they didn’t want to disclose what exactly the issue was. But if you have experience in IT security, or maybe played CTFs, then it was pretty obvious what was going on. My guess at the time was: (.zip) archive unpacking with path traversal from resources downloaded via insecure connection. It allows to overwrite files inside the app's sandboxed folder and in some cases even RCE. PoC video shows "code exec in js" probably overwrote some .html/.js files. And yes, that is basically what it is about. It’s about having relative paths, more specifically with a path traversal .., as files in the archive. This allows you to to go up in the folder hierarchy and write to files and folders outside of the intended unpack destination directory. And of course, when you have a software that takes a zip file and unpacks it, and allows path traversal, maybe some important files can be overwritten. And that could open doors like overwriting a script that would be executed later or stuff like that. And the reason why I was able to guess this, is because I play CTFs. and screwing around with zip files, or other archives, is a very typical challenge. A typical beginner challenge. But actually this issue with zip files is ancient. Hackers have exploited this before I even existed in the world. Checkout this phrack article from 1991. That’s over 27 years ago. Let’s check it out. It’s hacker history. The Complete Guide to Hacking WWIV by Inhuman. September 1991. WWIV is one of the most popular BBS programs in the country (that’s like a forum). With thousands of boards in WWIVnet and hundreds in the spinoff WWIVlink, there is a lot of support and community. The nice thing about WWIV is that it is very easy to set up. This makes it popular among the younger crowd of sysops who can't comprehend the complexities of...