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100 Days of Cloud Security - Day 85: CICD Goat - Inadequate Identity and Access Management

By Venkata Pathuri on

Day 85: CICD Goat - Inadequate Identity and Access Management

Overview

Welcome back to Day 85 of our cloud security journey! Today, we delve into the intricate world of Continuous Integration and Continuous Deployment (CICD) security, focusing on the vulnerabilities within Jenkins related to inadequate identity and access management. Building on our previous discussions about secure configurations and the importance of robust identity management, we will explore how weak identity controls can lead to significant security breaches.

Learning Objectives

In today's session, you'll master the art of identifying and exploiting vulnerabilities in Jenkins' identity management systems. By the end of this lesson, you will understand how weak identity controls can be exploited through methods such as brute-force attacks and rogue agent configurations. You’ll also learn how to configure Jenkins securely, ensuring that your CI/CD pipeline remains fortified against unauthorized access.

Deep Dive

Understanding the Vulnerability

The security vulnerabilities in Jenkins stem from two main issues: Weak Identity Management and Server-Side Credential Harvesting.

  1. Weak Identity Management: Jenkins typically utilizes its own internal user database, which often lacks essential security measures such as multi-factor authentication (MFA), rate limiting, and rigorous password policies. This makes it a prime target for brute-force attacks.

  2. Server-Side Credential Harvesting: Jenkins needs to connect to various agent nodes to perform tasks, often using SSH. If an attacker can impersonate a Jenkins agent by creating a rogue node, they can trick the Jenkins controller into revealing sensitive credentials stored for that node.

Real-World Example

Imagine a scenario where a Jenkins user, Knave, has admin privileges over Jenkins agents. An attacker could exploit this vulnerability as follows:

  1. Reconnaissance: The attacker performs a brute-force attack on Knave’s account using a commonly used wordlist, such as rockyou.txt. Due to weak password policies, they successfully guess the password (rockme).

  2. Privilege Analysis: Logging in as Knave, the attacker discovers they can create and configure new agents, but they cannot view global secrets directly.

  3. Setting the Trap: The attacker sets up an SSH server designed to log authentication attempts.

  4. Configuration & Exploit: They create a new Jenkins agent node configured to connect to their malicious SSH server, specifying the sensitive credential (flag8) while disabling host key verification.

  5. Exfiltration: When the Jenkins controller attempts to authenticate with the rogue agent, it inadvertently sends the flag8 password to the attacker's server, allowing the attacker to capture it.

Current Best Practices

To protect against such vulnerabilities, consider the following best practices:

  • Utilize External Identity Providers: Integrate Jenkins with robust external identity management systems that support MFA and strong password policies.
  • Implement Role-Based Access Control (RBAC): Limit permissions based on user roles to minimize exposure.
  • Regularly Audit Access: Conduct periodic reviews of user permissions and access logs to identify any unauthorized changes or access attempts.
  • Use Environment Variables for Secrets: Store sensitive credentials using environment variables, ensuring that they aren’t hard-coded into the Jenkins configuration.

Hands-On Practice

Setting Up a Secure Jenkins Environment

  1. Brute Force Attack Simulation:

    • Use a pre-defined wordlist like rockyou.txt: 
      hydra -l Knave -P /path/to/rockyou.txt 192.168.1.100 http-get /
    • Expected Outcome: Successful login with the credentials Knave : rockme.

  2. Creating a Rogue Node:

    • In Jenkins, navigate to Manage Jenkins > Manage Nodes and Clouds > New Node.
    • Configure the node:
      • Node Name: MaliciousAgent
      • Remote Root Directory: /tmp/MaliciousAgent
      • Launch Method: Launch agents via SSH.
      • Host: malicious.ssh.server.ip # Replace with your actual malicious server IP
      • Credentials: flag8 # Replace with your actual credential

  3. Verifying Connection:

    • Check the logs on your SSH server to see if the Jenkins controller attempts to authenticate with the stolen credentials.

Common Pitfalls

  • Disabling Host Key Verification: Ensure this setting is only used in secure testing environments; never disable host key verification in production.
  • Using Weak Passwords: Always enforce strong password policies.

Key Takeaways

Through today’s exploration of Jenkins’ vulnerabilities, we learned how inadequate identity and access management can lead to severe security risks. The interplay between weak identity controls and server-side credential harvesting poses a genuine threat. By understanding these risks and implementing best practices, you can significantly enhance the security posture of your CI/CD pipelines.

Real-World Applications

In production environments, these concepts are crucial for maintaining the integrity of software development processes. Organizations that implement robust identity management solutions not only safeguard their CI/CD pipelines but also ensure compliance with regulatory standards. By integrating modern authentication methods and meticulous access control, businesses can protect sensitive data from breaches and unauthorized access.

Journey Progress: 85/100 Days Complete 🚀