CVE-2021-21334 : Exploit Details and Defense Strategies
Understand the impact of CVE-2021-21334, a vulnerability in containerd versions < 1.3.10 and >= 1.4.0, < 1.4.4, allowing incorrect environment variable leaks and unintentional data sharing.
In containerd (an industry-standard container runtime) before versions 1.3.10 and 1.4.4, a vulnerability exists where containers sharing the same image may receive incorrect environment variables, potentially leading to unintentional sharing of sensitive information. Learn more about the impact, technical details, and mitigation steps for CVE-2021-21334.
Understanding CVE-2021-21334
This section delves into the details of the CVE-2021-21334 vulnerability affecting containerd.
What is CVE-2021-21334?
The vulnerability in containerd versions < 1.3.10 and >= 1.4.0, < 1.4.4 allows containers sharing the same image to receive incorrect environment variables, potentially exposing sensitive data.
The Impact of CVE-2021-21334
The vulnerability could result in the unintentional sharing of sensitive information among containers if they have different security contexts.
Technical Details of CVE-2021-21334
Explore the technical specifics of the CVE-2021-21334 vulnerability in containerd.
Vulnerability Description
Containers launched via containerd's CRI implementation may receive incorrect environment variables, risking exposure of sensitive data.
Affected Systems and Versions
The vulnerability impacts containerd versions < 1.3.10 and >= 1.4.0, < 1.4.4.
Exploitation Mechanism
Containers sharing the same image in rapid succession through containerd's CRI service may be vulnerable to the exposure of incorrect environment variables.
Mitigation and Prevention
Discover the steps to mitigate and prevent the CVE-2021-21334 vulnerability in containerd.
Immediate Steps to Take
Users are advised to update their containerd installations to versions 1.3.10 and 1.4.4 to address the vulnerability.
Long-Term Security Practices
Implement strict container isolation practices and avoid launching multiple containers with varying security contexts from the same image.
Patching and Updates
Stay informed about security patches and promptly apply updates to ensure your containerd runtime remains secure.