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Linux Privilege Escalation: Techniques and Security Tips

What is privilege escalation?

Linux Privilege Escalation: Techniques and Security Tips

Privilege escalation is a key concept for attackers seeking access to sensitive information or restricted functionality on an information system. Typically, this involves exploiting security weaknesses in a given system to escalate from a limited level of access, with standard permissions, to a higher level of access, with greater rights.

On Linux, there are several techniques for escalating a user’s privileges. Exploitation of configuration weaknesses, vulnerabilities in programs and broken access control are the main ones.

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Technical

ORM: exploiting cascades with improper input validation

ORM: exploiting cascades with improper input validation

In 2021, the OWASP top 10, which highlights the most common vulnerabilities in applications, has slightly changed. Injection vulnerabilities, previously the most critical, are now in third place.

One reason for this is that developers are becoming more aware of the risks associated with injection vulnerabilities through the implementation of more secure application development tools and practices. And of course, the most important measure to mitigate the risk of SQL injection is the use of prepared statements.

This is usually done using an ORM, which can introduce new risks as we will see in this article.

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Solutions

Exploiting and preventing insecure deserialization vulnerabilities

exploiting_preventing_insecure_deserialisation

When developing a game, you may need to save a player’s run to a file so that you don’t lose their progress and they can return to where they left off. Similarly, when developing an online text editor, you may want to preserve the content that the user has written.

Indeed, there are many cases where we want to save the state of our application to restore it in the future. Two terms are used to define this process: serialization and deserialization.

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Technical

What are deep links? Vulnerabilities, attacks and security best practices

What is a deep link?

What are deep links? Vulnerabilities, attacks and security best practices

Deep links are predefined URIs (Uniform Resource Identifiers) that allow direct access to an activity in a web or mobile application when clicked.

These links are usually found on pages within a web application or in the webviews of a mobile application. When the user clicks on a deep link, and has the application to open that type of link, a popup suggests opening the link with the corresponding application.

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Solutions

Brute force attacks: principles and security best practices

Brute force is certainly one of the most trivial attack techniques. The main reason: the human factor remains the weakest link in the cybersecurity chain. Indeed, there is no need to carry out social engineering attacks or sophisticated SQL injection attacks to steal credentials because habits die hard: users’ passwords remain weak and therefore easy to guess. With the right tools, even the most novice attackers can compromise data and cripple the systems of large companies.

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Technical

XSS (Cross-Site Scripting) vulnerabilities: principles, types of attacks, exploitations and security best practices

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.

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Technical

DOM-based XSS attacks: principles, impacts, exploitations and security best practices

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.

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Technical

Auditing an application protected by a CSRF token with Stepper

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.

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Solutions

How to secure a server?

Server security is a major issue for companies. Indeed, being a central element in the functioning of all the components of an information system (applications, network, infrastructure, employees, etc.), servers are often the prime targets of attacks.

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Technical

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

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.

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