Linux Kernel Vulnerability: Escaping Containers by Abusing Cgroups

Cloud Native Security Research Blog

Aqua Nautilus research team

SECURITY RESEARCH

Linux Kernel Vulnerability: Escaping Containers by Abusing Cgroups

CVE-2022-0492, a recently disclosed high-severity Linux vulnerability that relates to a weakness in the handling of release_agent in cgroups, could allow for container escape under some circumstances. Fortunately, in common container configurations, the various layers of security hardening will block the effective execution of this vulnerability.

SECURITY RESEARCH

Dirty Pipe Linux Vulnerability: Overwriting Files in Container Images

A new CVE in the Linux kernel was released this week. CVE-2022-0847, aka “Dirty Pipe”, is a vulnerability that allows users on a Linux system to overwrite the contents of files that they can read but shouldn’t be able to write to. Looking at this vulnerability from the perspective of hosts using containerization software such …

SECURITY RESEARCH

CVE-2022-0185 in Linux Kernel Can Allow Container Escape in Kubernetes

Last week, a new high-severity CVE was released that affects the Linux kernel. This vulnerability provides an opportunity for an attacker who has access to a system as an unprivileged user to escalate those rights to root. To do this, the attacker must have a specific Linux capability, CAP_SYS_ADMIN, which reduces the risk of breakout …

SECURITY RESEARCH

The Nightmare Before Christmas: Looking Back at Log4j Vulnerabilities

Last month, a zero-day vulnerability in the extremely popular Log4j logging framework overwhelmed the security community during the already busy end-of-year rush. Just keeping up with Log4j news and updates has been no easy task, let alone fixing the multiple vulnerabilities discovered almost daily. Organizations worked hard to apply patches for the original zero-day vulnerability, …

SECURITY RESEARCH

CVE-2021-44832: New Arbitrary Code Execution Vulnerability in Log4j

This holiday season, adversaries aren’t taking a vacation, massively exploiting multiple vulnerabilities in Log4j, a highly popular Java logging library. Amid the ongoing efforts of organizations to patch their vulnerable systems, a new Log4j vulnerability, tracked as CVE-2021-44832, has been discovered. It allows for an arbitrary code execution via JDBC Appender when an attacker can …

SECURITY RESEARCH

Threat Alert: Evolving Attack Techniques of Autom Cryptomining Campaign

Over the past three years, we at Team Nautilus have been tracking an ongoing cryptomining campaign attacking our honeypots. It got the name Autom due to a shell script that was downloaded and that initiated the attack. Through the years, the campaign has evolved, demonstrating new techniques to hide the attack. In this blog, we …

SECURITY RESEARCH

Stopping a DreamBus Botnet Attack with Aqua’s CNDR

We recently came across a real-life scenario that is very common for organizations. A developer with admin access launched a cloud native application but made a mistake and misconfigured it with weak credentials. Just 12 hours later, the environment was attacked by the DreamBus botnet, which proceeded to evade defenses and run Kinsing malware and …

SECURITY RESEARCH

Threat Alert: Tracking Real-World Apache Log4j Attacks

This blog was co-authored with Ori Glassman, a security researcher at Aqua Security Until last week, Log4j was just a popular Java logging framework, one of the numerous components that run in the background of many modern web applications. But since a zero-day vulnerability (CVE-2021-44228) was published, Log4j has made a huge impact on the …

SECURITY RESEARCH

RATs in the Cloud: Kubernetes UI Tools Turn into a Weapon

For many years, threat actors have been using legitimate remote access tools (RATs) in their campaigns, tricking users into installing them to get full control over the victims’ systems. Similarly, in the cloud native world, attackers are increasingly targeting user interface (UI) tools to gain access to Docker and Kubernetes instances. In this blog, we’ll …

SECURITY RESEARCH

Tracee Runtime Security Series: Writing Custom Tracee Rules

As an open source runtime security tool, Tracee provides a base rule set that can detect a variety of attacks. However, there’s often the need to add new rules either to contribute to the project or to provide specific rules for your environment. Because Tracee allows for new rules to be written in Rego and …

SECURITY RESEARCH

Threat Actors Using release_agent Container Escape

Earlier this year, Aqua’s Team Nautilus detected a cryptocurrency mining campaign targeting our honeypots. As part of the campaign, the threat actors used a container escape technique that leverages the CGroup release_agent feature. This technique allows an attacker to break out from the container and compromise the host and, potentially, the entire network of an organization. …

SECURITY RESEARCH

The Great Escape: A Blast Radius Analysis of Container Attacks

In 2021, container attacks have been on the rise. We observed numerous attacks that were designed to escape container environments to the underlying host, increasing the impact of the attack. But how much damage can be caused when an attacker manages to escape a container? To answer this question, we conducted an analysis of real-world …

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