CVE-2021-25320 : What You Need to Know

A critical Improper Access Control vulnerability was discovered in Rancher, allowing unauthorized users to access cloud credentials through the proxy API. This CVE affects Rancher versions prior to 2.5.9 and 2.4.16.

Understanding CVE-2021-25320

This section will provide insights into the nature and impact of the CVE.

What is CVE-2021-25320?

The CVE-2021-25320 vulnerability in Rancher enables cluster users to request access to cloud providers by utilizing the cloud-credential ID. Rancher grants access to the requested credentials without conducting additional validations.

The Impact of CVE-2021-25320

The impact of this vulnerability is rated as critical, with a CVSS v3.1 base score of 9.9. It poses a high risk to data confidentiality, integrity, and availability, emphasizing the severity of unauthorized access to cloud credentials.

Technical Details of CVE-2021-25320

This section will delve into the technical aspects of the CVE.

Vulnerability Description

The vulnerability arises due to Rancher's improper handling of requests to cloud providers, allowing unauthorized users to exploit the cloud-credential ID.

Affected Systems and Versions

Rancher versions prior to 2.5.9 and 2.4.16 are impacted by this vulnerability, making it crucial for users to update to the patched versions promptly.

Exploitation Mechanism

Unauthorized cluster users can exploit this vulnerability by crafting requests with the cloud-credential ID, tricking Rancher into attaching the requested credentials without proper verification.

Mitigation and Prevention

This section will outline the necessary steps to mitigate and prevent the exploitation of CVE-2021-25320.

Immediate Steps to Take

Users are advised to update Rancher to versions 2.5.9 and 2.4.16 or later to eliminate the vulnerability and secure cloud credentials.

Long-Term Security Practices

Implementing strict access controls and regular security audits can help prevent similar access control vulnerabilities in the future.

Patching and Updates

Regularly applying security patches and staying informed about software updates is essential to address known vulnerabilities and enhance system security.