While we at Silent Signal are strong believers in human creativity when it comes to finding new, or unusual vulnerabilities, we’re also constantly looking for ways to transform our experience into automated tools that can reliably and efficiently detect already known bug classes. The discovery of CVE-2019-6976 – an uninitialized...
2020-04-20 — 3 minute readSANS Institute accepted my GWAPT Gold Paper about Unix-style approach to web application testing, the paper is now published in the Reading Room. The paper introduces several problems I’ve been facing while testing web applications, which converged in a common direction. Burp Suite is known by most and used by...
2020-03-27 — 1 minute readWith the advent of PSD2 APIs, we had the opportunity to test some of them upon request from our clients. Although internet-facing APIs were already a thing thanks to smartphone apps, it seems that regulatory requirements and 3-way setups (customer, bank, provider) led to some surprises. Here are some of...
2020-01-27 — 4 minute readMany tools are timeless: a quality screwdriver will work in ten years just as fine as yesterday. Reverse engineering tools, on the other hand need constant maintenance as the technology we try to inspect with them is a moving target. We’ll show you how just a simple exercise in Android...
2019-10-21 — 5 minute readSome VPNs allow split tunneling, however, Cisco AnyConnect and many other solutions offer a way for network administrators to forbid this. When that happens, connecting to the VPN seals off the client from the rest of the LAN. As it turns out, breaking this seal is not that hard, which...
2019-07-02 — 5 minute readI had the pleasure to present my research about the IPC mechanisms of Kaspersky products at the IV. EuskalHack conference this weekend. My main motivation for this research was to further explore the attack surface hidden behind the self-defense mechanisms of endpoint security software, and I ended up with a...
2019-06-24 — 1 minute readThere are many obfuscators for different languages, and some of those offer reversible options for easier field debugging. Eazfuscator.NET is one of these and with a bit of reverse engineering, whole files can be restored with the original symbols once you have the password. In our case, the developer left...
2019-05-10 — 5 minute readDuring a recent engagement we encountered a quite common web application feature: profile image uploads. One of the tools we used for the tests was the UploadScanner Burp Suite extension, that reported no vulnerabilities. However, we noticed that the profile picture of our test user showed seemingly random pixels. This...
2019-04-18 — 8 minute read