COURSE

CVE Series: “Leaky Vessels” Container Breakout (CVE-2024-21626)

Course

CVE-2024-21626 is a severe vulnerability affecting all versions of runc up to 1.1.11, a critical component utilized by Docker and other containerization technologies like Kubernetes. This vulnerability enables an attacker to escape from a container to the underlying host operating system. Put on your red team hat to exploit this vulnerability.

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Full access included with 
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 and 
Teams

1

H

25

M
Time

Intermediate

i
Designed for learners who have no prior work experience in IT or Cybersecurity, but are interested in starting a career in this exciting field.
Designed for learners with prior cybersecurity work experience who are interested in advancing their career or expanding their skillset.
Designed for learners with a solid grasp of foundational IT and cybersecurity concepts who are interested in pursuing an entry-level security role.
Experience Level

184

Enrollees

840

XP

1

i

Earn qualifying credits for certification renewal with completion certificates provided for submission.
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Skills you'll gain

Course Outline

1
Module 1: Introduction to Docker and runc
H
5
Min
1
Module 2: CVE-2024-26121 Exploitation
H
35
Min
1
Module 3: CVE-2024-26121 Mitigation
H
45
Min

1.1 Introduction to Docker

Free

20 XP

H

5m

1.2 Root Cause Analysis of CVE-2024-21626

Free

200 XP

H

m

2.1 Exploiting the Vulnerability

Free

20 XP

H

5m

2.2 Lab - Exploiting CVE-2024-21626

Free

20 XP

H

5m

3.1 How To Remediate CVE-2024-21626

Free

200 XP

H

15m

3.2 LAB - Identify a malicious dockerfile

Free

200 XP

H

30m

Module 1: Introduction to Docker and runc
Heading
Module 1: Introduction
1
Hr
5
Min
Module 2: CVE-2024-26121 Exploitation
Heading
Module 1: Introduction
1
Hr
5
Min
Module 3: CVE-2024-26121 Mitigation
Heading
Module 1: Introduction
1
Hr
5
Min
1.1 Introduction to Docker

5m

Module 1: Introduction to Docker and runc
1.2 Root Cause Analysis of CVE-2024-21626

m

Module 1: Introduction to Docker and runc
2.1 Exploiting the Vulnerability

5m

Module 2: CVE-2024-26121 Exploitation
2.2 Lab - Exploiting CVE-2024-21626

5m

Module 2: CVE-2024-26121 Exploitation
3.1 How To Remediate CVE-2024-21626

15m

Module 3: CVE-2024-26121 Mitigation
3.2 LAB - Identify a malicious dockerfile

30m

Module 3: CVE-2024-26121 Mitigation
Course Description

Course Description

CVE-2024-21626 is a severe vulnerability affecting all versions of runc up to 1.1.11, a critical component utilized by Docker and other containerization technologies like Kubernetes. This vulnerability enables an attacker to escape from a container to the underlying host operating system. Exploitation can occur either through executing a malicious image or building an image using a compromised Dockerfile or base image. Specifically, the vulnerability exploits the order of operations related to the WORKDIR directive in Dockerfiles, allowing an attacker to maintain access to privileged host directory file descriptors and thereby gain full access to the host's root filesystem. This potentially leads to unauthorized data access and system control, operating under the privileges of the containerization user, typically as the root user. In this course you’ll be putting on your red team hat to exploit this vulnerability.

Target Audience

This course is for seasoned red teamers, penetration testers, security and vulnerability assessment analysts, and system administrators who want to know how to exploit and protect against the latest vulnerabilities impacting enterprise systems.

Course Level

Intermediate

Prerequisites

Basic knowledge of Docker as well as functional knowledge of the Linux command line.

Helpful Links

  • CVE Entry: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-21626 (Official CVE)
  • NIST Entry: https://nvd.nist.gov/vuln/detail/CVE-2024-21626
  • Security Advisory: https://github.com/opencontainers/runc/security/advisories/GHSA-xr7r-f8xq-vfvv
  • Snyk Blog: https://snyk.io/blog/cve-2024-21626-runc-process-cwd-container-breakout/ and https://snyk.io/blog/leaky-vessels-docker-runc-container-breakout-vulnerabilities/
  • Exploits: https://github.com/NitroCao/CVE-2024-21626?tab=readme-ov-file
  • Red Hat Advisory: https://access.redhat.com/security/cve/cve-2024-21626

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Included in a Path

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Learn

Learn core concepts and get hands-on with key skills.

Practice

Exercise your problem-solving and creative thinking skills with security-centric puzzles

Prove

Assess your knowledge and skills to identify areas for improvement and measure your growth

Get Hands-on Learning

Put your skills to the test in virtual labs, challenges, and simulated environments.

Measure Your Progress

Track your skills development from lesson to lesson using the Cybrary Skills Tracker.

Connect with the Community

Connect with peers and mentors through our supportive community of cybersecurity professionals.

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Security Engineer and Pentester/

"Cybrary really helped me get up to speed and acquire a baseline level of technical knowledge. It offers a far more comprehensive approach than just learning from a book. It actually shows you how to apply cybersecurity processes in a hands-on way"

Don Gates

Principal Systems Engineer/SAIC

"Cybrary’s SOC Analyst career path was the difference maker, and was instrumental in me landing my new job. I was able to show the employer that I had the right knowledge and the hands-on skills to execute the role."

Cory

Cybersecurity analyst/

"I was able to earn my CISSP certification within 60 days of signing up for Cybrary Insider Pro and got hired as a Security Analyst conducting security assessments and penetration testing within 120 days. This certainly wouldn’t have been possible without the support of the Cybrary mentor community."

Mike

Security Engineer and Pentester/

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courses

CVE Series: “Leaky Vessels” Container Breakout (CVE-2024-21626)

CVE-2024-21626 is a severe vulnerability affecting all versions of runc up to 1.1.11, a critical component utilized by Docker and other containerization technologies like Kubernetes. This vulnerability enables an attacker to escape from a container to the underlying host operating system. Put on your red team hat to exploit this vulnerability.

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Start CourseSubscribe for UpdatesNeed to train your team? Learn more
Start Course for FreeNeed to train your team? Learn more
1
H 
25
M
Time
Intermediate
difficulty
1
ceu/cpe

Course Content

Course Description

Course Description

CVE-2024-21626 is a severe vulnerability affecting all versions of runc up to 1.1.11, a critical component utilized by Docker and other containerization technologies like Kubernetes. This vulnerability enables an attacker to escape from a container to the underlying host operating system. Exploitation can occur either through executing a malicious image or building an image using a compromised Dockerfile or base image. Specifically, the vulnerability exploits the order of operations related to the WORKDIR directive in Dockerfiles, allowing an attacker to maintain access to privileged host directory file descriptors and thereby gain full access to the host's root filesystem. This potentially leads to unauthorized data access and system control, operating under the privileges of the containerization user, typically as the root user. In this course you’ll be putting on your red team hat to exploit this vulnerability.

Target Audience

This course is for seasoned red teamers, penetration testers, security and vulnerability assessment analysts, and system administrators who want to know how to exploit and protect against the latest vulnerabilities impacting enterprise systems.

Course Level

Intermediate

Prerequisites

Basic knowledge of Docker as well as functional knowledge of the Linux command line.

Helpful Links

  • CVE Entry: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-21626 (Official CVE)
  • NIST Entry: https://nvd.nist.gov/vuln/detail/CVE-2024-21626
  • Security Advisory: https://github.com/opencontainers/runc/security/advisories/GHSA-xr7r-f8xq-vfvv
  • Snyk Blog: https://snyk.io/blog/cve-2024-21626-runc-process-cwd-container-breakout/ and https://snyk.io/blog/leaky-vessels-docker-runc-container-breakout-vulnerabilities/
  • Exploits: https://github.com/NitroCao/CVE-2024-21626?tab=readme-ov-file
  • Red Hat Advisory: https://access.redhat.com/security/cve/cve-2024-21626
This course is part of a Career Path:
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Certificate of Completion

Complete this entire course to earn a CVE Series: “Leaky Vessels” Container Breakout (CVE-2024-21626) Certificate of Completion

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Purpose Statement

Cybrary Career Paths are comprehensive training programs designed to prepare you for the most in-demand roles in the cybersecurity workforce. Each path follows a Learn, Practice, Prove model and includes different activity types aligned to key topics within the path’s security domain. As you progress through the path, your progress will be measured in real time using Experience Points (XP) that serve as a comprehensive capability score for each topic. Upon completing all of the requirements for a path, you will be rewarded with a shareable digital badge via Credly.
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Overview

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Frequently Asked Questions
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What Will I Learn?
Foundations
Focused on the core IT competencies that cybersecurity professionals need to succeed in any career path.
Defensive Security
Focused on trying to find the bad guys. Topics such as threat intelligence, threat hunting, network monitoring, incident response. Defensive security is a reactive measure taken once a vulnerability is found through prevention, detection, and response.
Engineering and Operations
Focused on building and operating information systems.
Governance, Risk, and Compliance
Focused on the core IT competencies that cybersecurity professionals need to succeed in any career path.
Leadership and Management
Focused on program design and oversight. Covers project and program management.
Offensive Security
Focused on validating security controls by trying to break them (i.e. penetration testing or ethical hacking). Topics such as Kali Linux, metasploit, scanning, and privilege escalation. Offensive security seeks out the problem or vulnerability through ethical hacking and finds a solution to disable the operation.
Offensive Security
Focused on the core IT competencies that cybersecurity professionals need to succeed in any career path.
Path Outline

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Course Outline

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