Description
A vulnerability has been identified within Rancher where a cluster or node driver can be used to escape the chroot jail and gain root access to the Rancher container itself. In production environments, further privilege escalation is possible based on living off the land within the Rancher container itself. For the test and development environments, based on a –privileged Docker container, it is possible to escape the Docker container and gain execution access on the host system. This issue affects rancher: from 2.7.0 before 2.7.16, from 2.8.0 before 2.8.9, from 2.9.0 before 2.9.3.
EPSS Score:
0%
Comprehensive Technical Analysis of EUVD-2024-3054
1. Vulnerability Assessment and Severity Evaluation
The vulnerability identified in Rancher (EUVD-2024-3054) allows an attacker to escape the chroot jail and gain root access to the Rancher container. This can lead to further privilege escalation within the container and, in certain environments, escape to the host system. The CVSS (Common Vulnerability Scoring System) base score of 9.1 indicates a critical severity level. The vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H breaks down as follows:
- AV:N (Network Vector): The vulnerability is exploitable over the network.
- AC:L (Low Complexity): The attack requires low complexity to execute.
- PR:H (High Privileges Required): The attacker needs high privileges to exploit the vulnerability.
- UI:N (No User Interaction): No user interaction is required for the attack to succeed.
- S:C (Changed Scope): The vulnerability affects a different security scope.
- C:H/I:H/A:H (High Confidentiality, Integrity, and Availability Impact): The vulnerability has a high impact on confidentiality, integrity, and availability.
2. Potential Attack Vectors and Exploitation Methods
- Cluster or Node Driver Exploitation: An attacker can exploit the cluster or node driver to escape the chroot jail and gain root access within the Rancher container.
- Privilege Escalation: Once root access is obtained within the container, the attacker can leverage existing tools and scripts (living off the land) to further escalate privileges.
- Docker Container Escape: In test and development environments where Docker containers are run with
--privilegedflag, the attacker can escape the Docker container and gain execution access on the host system.
3. Affected Systems and Software Versions
The vulnerability affects the following versions of Rancher:
- Rancher 2.7.0 to 2.7.15
- Rancher 2.8.0 to 2.8.8
- Rancher 2.9.0 to 2.9.2
4. Recommended Mitigation Strategies
- Update Rancher: Upgrade to the patched versions of Rancher:
- Rancher 2.7.16 or later
- Rancher 2.8.9 or later
- Rancher 2.9.3 or later
- Avoid Privileged Containers: Do not run Docker containers with the
--privilegedflag in production environments. - Implement Least Privilege: Ensure that only necessary privileges are granted to users and services.
- Monitor and Audit: Regularly monitor and audit container activities for any suspicious behavior.
- Network Segmentation: Segment the network to limit the attack surface and contain potential breaches.
5. Impact on European Cybersecurity Landscape
The vulnerability poses a significant risk to organizations using Rancher for container orchestration, particularly those in the European Union. Given the critical nature of the vulnerability, it could lead to unauthorized access, data breaches, and disruption of services. The European cybersecurity landscape must prioritize timely patching and adherence to best practices to mitigate such risks.
6. Technical Details for Security Professionals
- Chroot Jail Escape: The vulnerability allows an attacker to escape the chroot jail, which is a security mechanism used to restrict an application's access to the filesystem.
- Privilege Escalation Techniques: Attackers can use various techniques such as exploiting misconfigurations, leveraging existing tools within the container, and abusing privileged Docker containers to escalate privileges.
- Detection and Response: Implement intrusion detection systems (IDS) and intrusion prevention systems (IPS) to detect and respond to suspicious activities. Regularly review logs and alerts for any indicators of compromise.
- Patch Management: Ensure a robust patch management process is in place to apply security updates promptly.
Conclusion
EUVD-2024-3054 is a critical vulnerability in Rancher that requires immediate attention. Organizations should prioritize updating to the patched versions and implementing best practices to mitigate the risk. The European cybersecurity community must remain vigilant and proactive in addressing such vulnerabilities to protect against potential attacks.