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XSS (Cross-site Scripting) are particularly widespread vulnerabilities in web applications. In fact, more than one in two applications contains it according to various studies, both old and new. To support this statement, it is the most common vulnerability that we discover and exploit during our penetration tests on all types of applications and websites.

Principles, types of XSS attacks, exploitations, we present in this article an overview of XSS, as well as security best practices and measures to implement to counter the risks of attack.

DOM-based XSS is a particularly unknown vulnerability because it is rather rare. Indeed, it is a variant of XSS (Cross-Site Scripting) – certainly one of the most widespread vulnerabilities in web applications.

Principles, impacts, possible exploits, we present in this article a complete overview of DOM XSS vulnerabilities as well as best practices to prevent the risks of attacks and compromise of your web applications.

Introduction

Auditing an app protected by a CSRF token with Stepper

The CSRF token is a protection that requires the insertion of a random and dynamic value in a request. This value is then analysed by the server to determine whether the request is legitimate. During your penetration tests, you have probably already come across an application using these CSRF tokens. In this case, you may have noticed how confusing it is to analyse such an application with Burp.

SQL injections (SQLi): principles, impacts, exploitations and security best practices

Most web applications use one or multiple databases to store and process information in real time.

Indeed, when a user sends requests, the web application queries the database in order to build the response. However, when the information provided by the user is used to forge the query to the database, an attacker can alter the database by using it for purposes other than those intended by the original developer. This allows an attacker to query the database via SQL injection, or SQLi.

node_common_vulnerabilities_best_practices

Another article on Node.js security? But in this one, we focus on the most common vulnerabilities encountered during penetration testing.

Node related vulnerabilities have consequences for your entire web application. It is therefore essential to detect and correct them. Some of these flaws are not specific to Node and also exist in other languages and frameworks. This is why we have focused on providing general best practices and specific tools for Node.js.

Let’s dive in.

Server Side Template injection vulnerability

Server-side template injection (SSTI) vulnerabilities tend to be less researched than other types of flaws. However, their impact is significant and often leads to remote code execution (RCE). They are therefore flaws that should not be underestimated.

In what contexts do SSTI vulnerabilities occur? How to detect them and how to prevent them?

This is what we will see in this article.