CVE-2019-12274 : Exploit Details and Defense Strategies

In Rancher versions 1 and 2 up to 2.2.3, a vulnerability exists where users without administrative privileges can exploit certain node driver options to gain control over the Rancher management plane by uploading sensitive files.

Understanding CVE-2019-12274

This CVE highlights a security issue in Rancher versions 1 and 2 up to 2.2.3 that allows unprivileged users to escalate their privileges and potentially compromise the Rancher management plane.

What is CVE-2019-12274?

In Rancher versions 1 and 2 up to 2.2.3, users without administrative privileges can gain control over the Rancher management plane if they are allowed to deploy nodes. This is due to certain node driver options that enable the posting of specific data to the cloud, potentially leading to the upload of sensitive files.

The Impact of CVE-2019-12274

The vulnerability could result in unauthorized users gaining admin access to the Rancher management plane, compromising the security and integrity of the system. Exploitation of this vulnerability could lead to unauthorized access to sensitive files.

Technical Details of CVE-2019-12274

This section provides more technical insights into the vulnerability.

Vulnerability Description

The issue arises from the ability of unprivileged users to exploit node driver options to upload sensitive files like /root/.kube/config or /var/lib/rancher/management-state/cred/kubeconfig-system.yaml, potentially compromising the system.

Affected Systems and Versions

Rancher versions 1 and 2 up to 2.2.3

Exploitation Mechanism

Unprivileged users with permission to deploy nodes can exploit certain node driver options to gain admin access to the Rancher management plane.

Mitigation and Prevention

It is crucial to take immediate steps to address and prevent the exploitation of this vulnerability.

Immediate Steps to Take

Upgrade Rancher to version 2.2.4 or later that addresses this CVE.
Restrict user permissions to prevent unauthorized access.

Long-Term Security Practices

Regularly review and update user privileges to ensure least privilege access.
Monitor and audit file uploads and system access for suspicious activities.

Patching and Updates

Apply patches and updates provided by Rancher to mitigate the vulnerability and enhance system security.