CVE-2022-31075 : What You Need to Know

KubeEdge is an open-source system designed to extend native containerized application orchestration capabilities to hosts at the Edge. This CVE, marked as CVE-2022-31075, highlights a Denial of Service (DoS) vulnerability present in KubeEdge versions prior to 1.11.1, 1.10.2, and 1.9.4, affecting the EdgeCore component when signing the CSR from EdgeCore.

Understanding CVE-2022-31075

This section delves into the specifics of the vulnerability, its impact, affected systems, and the recommended mitigation strategies.

What is CVE-2022-31075?

KubeEdge's EdgeCore module is vulnerable to a DoS attack on CloudHub when processing specifically crafted HTTP requests. An attacker could potentially crash the CloudHub HTTP service by sending a large request body, leading to a denial of service condition. However, this attack vector is mitigated by the need for the request to pass through authorization, limiting potential exploitation to authorized users.

The Impact of CVE-2022-31075

The vulnerability's CVSS v3.1 score is 4.9, categorizing it as having a medium severity level. While it requires high privileges for exploitation, the attack complexity is considered low as the vector is network-based. The primary consequence is the denial of service affecting CloudHub.

Technical Details of CVE-2022-31075

For a deeper insight, let's explore the technical aspects of the vulnerability.

Vulnerability Description

The vulnerability arises due to inadequate handling of HTTP requests with excessively large bodies, causing a memory exhaustion vector that crashes the CloudHub service.

Affected Systems and Versions

KubeEdge versions prior to 1.11.1, 1.10.2, and 1.9.4 with the CloudHub module enabled in the

cloudcore.yaml

file are vulnerable to this DoS attack.

Exploitation Mechanism

Authorized users, upon sending a well-crafted HTTP request to CloudHub containing an oversized body, can exhaust the available memory, resulting in a denial of service incident.

Mitigation and Prevention

To address CVE-2022-31075, immediate steps and a long-term security strategy are essential.

Immediate Steps to Take

As a temporary workaround, disable the CloudHub switch in the

cloudcore.yaml

configuration file to mitigate the risk of DoS attacks on CloudHub.

Long-Term Security Practices

In the long run, staying updated with security patches and ensuring the CloudHub module is only enabled for necessary functions can help prevent potential exploits.

Patching and Updates

It is crucial to update KubeEdge to versions 1.11.1, 1.10.2, or 1.9.4 where the vulnerability has been patched by the developers.