A kernel of truth: Linux isn't as foolproof as we may have thought

A world without Linux is hard to imagine. Every Google search we run is accomplished on Linux-based servers. Behind the Kindle we enjoy reading, to the social media sites we spend scrolling away every day sits the Linux kernel. Would you believe your ears if I tell you the world’s top 500 supercomputers run on Linux? No wonder Linux has permeated into every aspect of the digital age, not to mention its steadily growing enterprise user base.


How to mitigate CVE-2021-33909 Sequoia with Falco - Linux filesystem privilege escalation vulnerability

The CVE-2021-33909, named Sequoia, is a new privilege escalation vulnerability that affects Linux’s file system. It was disclosed in July, 2021, and it was introduced in 2014 on many Linux distros; among which we have Ubuntu (20.04, 20.10 and 21.04), Debian 11, Fedora 34 Workstation and some Red Hat products, too. This vulnerability is caused by an out-of-bounds write found in the Linux kernel’s seq_file in the Filesystem layer.


Preventing Data Exfiltration with eBPF

To keep your business secure, it is important not only to keep the hackers from getting in but also to keep your data from getting out. Even if a malicious actor gains access to the server, for example via an SSH session, it is vital to keep the data from being exfiltrated to an unauthorized location, such as IP addresses not under your organization’s control. In considering a solution to protect against data exfiltration, it is critical to note that one policy does not fit all.


REvil's new Linux version

The ransomware-as-a-service (RaaS) operation behind REvil have become one of the most prolific and successful threat groups since the ransomware first appeared in May 2019. REvil has been primarily used to target Windows systems. However, new samples have been identified targeting Linux systems. AT&T Alien Labs™ is closely monitoring the ransomware landscape and has already identified four of these samples in the wild during the last month, after receiving a tip from MalwareHuntingTeam.


How to detect sudo's CVE-2021-3156 using Falco

A recent privilege escalation heap overflow vulnerability (CVSS 7.8), CVE-2021-3156, has been found in sudo. sudo is a powerful utility built in almost all Unix-like based OSes. This includes Linux distributions, like Ubuntu 20 (Sudo 1.8.31), Debian 10 (Sudo 1.8.27), and Fedora 33 (Sudo 1.9.2). This popular tool allows users to run commands with other user privileges.


Securing Kubernetes clusters with Sysdig and Red Hat Advanced Cluster Management

In this blog, we introduce the new integration between Sysdig Secure and Red Hat® Advanced Cluster Management for Kubernetes that protects containers, Kubernetes, and cloud infrastructure with out-of-the-box policies based on the Falco open-source runtime security project. Organizations are quickly growing their Kubernetes footprint and need ways to achieve consistent management and security across clusters.


What is eBPF and How Does it Work?

About a year ago, a friend of mine decided to build an EVM (Ethereum Virtual Machine) assembler in Rust. After some prodding from him, I began to help by writing unit tests. At the time, I knew very little about operating systems and started to read about lexical and symbolical analyzers. I was quickly in way over my head. What I did retain, however, was a newfound appreciation for the OS as a whole. So, when he started raving about eBPF, I knew I was in for a treat.


What makes ARMO customers immune - by design - against vulnerabilities like the recently discovered CVE-2020-14386?

CVE-2020-14386 is yet another severe vulnerability that was recently discovered in the Linux kernel. It reminds us that the fight against vulnerabilities is not over. This particular one allows a regular application to escalate its privileges and gain root access to the machine. Indeed, it sounds scary.