Michał Bentkowski

Security analysis of <portal> element

Portal is a fairly new HTML element that is currently supported only in Chrome Canary behind the #enable-portals flag. Their main objective is to enable seamless transitions to the web by pre-rendering content in an iframe-like element that can be then “promoted” (activated) to a top-level frame. In this article we focus of security analysis thereof.

Another XSS in Google Colaboratory

Three months ago I described XSS which I found in Google Colaboratory. Before you start reading this article, I recommend you go back to the previous one first, because I am going to develop the topic which started there. In a nutshell, however, what previously happened: I was looking for XSS in Google Colaboratory (an …

Description of CVE-2018-0296 error – bypassing authorization in Cisco ASA web interface.

In this text we describe CVE-2018-0296 error concerning Cisco ASA devices, publicized 6th of June by Cisco. Officially, vulnerability was classified as Denial Of Service, although our report concerned a different type of error. More details below. A word of introduction:Cisco ASA device (Adaptive Security Appliance) is very popular and is often a part of …

BetterZip – from XSS to any code execution

XSS (Cross-Site Scripting) is one of the most popular vulnerabilities in the world of web applications. On the OWASP TOP 10 list it has been ranked first in terms of popularity for many years. Until now, XSS has usually been identified only in the world of browsers. However, due to the fact that HTML and …

DoS attack on applications – through regular expressions

The American programmer, Jamie Zawinski, once said, “Some people, when they encounter a problem, think to themselves, ‘I know! I will use regular expressions.’ And now they have two problems.” In this article, we’ll see how true the words are if the regular expression has been spelled incorrectly, allowing the Denial-of-Service to be launched on …

Calculation of pseudo-random numbers generator state – on the example of Math. random() from Firefox

In this text: We will get to know how pseudo-random number generators operate We will learn how the XorShift128Plus algorithm, which is the basis of pseudo-random number generators in all the most popular browsers (Firefox, Chrome, Edge), works. We will get to know the Z3Prover tool, thanks to which we will be able to calculate …