A security issue was discovered in the Kubernetes Image Builder versions <= v0.1.37 where default credentials are enabled during the image build process. Virtual machine images built using the Proxmox provider do not disable these default credentials, and nodes using the resulting images may be accessible via these default credentials. The credentials can be used to gain root access. Kubernetes clusters are only affected if their nodes use VM images created via the Image Builder project with its Proxmox provider.
This vulnerability allows attackers to gain unauthorized access to Kubernetes nodes, potentially compromising the entire cluster. The severity of this vulnerability is rated as critical with a CVSS score of 9.8, indicating a high level of risk for organizations utilizing affected versions of the Kubernetes Image Builder.
Risk to organizations includes unauthorized access to sensitive data or system operations through root privileges. Organizations should prioritize patching immediately.
Given the critical nature of this vulnerability, organizations must act swiftly to mitigate potential exploitation. No public exploit has been confirmed at this time, but the default credential exposure poses a significant risk that should not be overlooked.
With the publication date of October 15, 2024, organizations must take immediate action to secure their environments.
Vulnerability Details
The vulnerability identified as CVE-2024-9486 affects Kubernetes Image Builder versions up to and including v0.1.37. The default credentials remain enabled during the image build process, particularly with images created via the Proxmox provider.
The CVSS score of 9.8 categorizes this vulnerability as critical, highlighting its potential impact: high confidentiality, integrity, and availability implications.
The vulnerability is classified under CWE-798, indicating the presence of a use of hard-coded credentials. This classification underscores the severe implications of using default credentials in production environments.
Technical Analysis
The root cause of this vulnerability lies in the configuration of the Kubernetes Image Builder, specifically in how it handles credentials during the image creation process. By default, the Proxmox provider does not disable hard-coded credentials, leading to potential unauthorized access.
The attack vector for this vulnerability is network-based, with low attack complexity. There are no privileges required for an attacker to exploit this vulnerability, and no user interaction is necessary.
The impact of this vulnerability is significant across confidentiality, integrity, and availability, making it essential for organizations to address this vulnerability promptly.
Risk & Impact Analysis
The deployment risk associated with this vulnerability is substantial, particularly for organizations that utilize the Kubernetes Image Builder to create VM images using the Proxmox provider. Attackers may gain root access to nodes, leading to a potential takeover of the entire Kubernetes cluster.
The urgency for organizations to patch this vulnerability is critical, as the potential for widespread exploitation exists. Security teams should prioritize this vulnerability in their remediation plans.
Organizations should assess their environments to identify any instances of the affected Kubernetes Image Builder versions and take corrective actions to mitigate the associated risks.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions prior to vendor patch (v0.1.38) of Kubernetes Image Builder are affected by this vulnerability.
Mitigation & Remediation
To remediate this vulnerability, organizations should upgrade to the latest version of Kubernetes Image Builder (v0.1.38) where default credentials are properly disabled. If immediate patching is not possible, consider using alternative VM images that do not expose default credentials.
Organizations can also implement configuration hardening and network controls to restrict access to nodes running vulnerable images. Continuous monitoring for unauthorized access attempts should also be established.
For more information on security measures, organizations can refer to our penetration testing services that help identify and remediate vulnerabilities.
Detection Guidance
Organizations should monitor logs for any unauthorized access attempts, especially focusing on login attempts using default credentials. Log indicators may include repeated failed login attempts or successful logins from unrecognized IP addresses.
Behavioral anomalies such as unexpected changes in user permissions or unauthorized access to sensitive data should also be flagged for review.
Network signatures indicating unauthorized access attempts or exploitation attempts should be established to enhance detection capabilities.
AppSecure Threat Intelligence Insight
The long-term significance of this vulnerability is substantial, as it highlights the critical importance of securing default credentials within infrastructure as code solutions like Kubernetes Image Builder. Organizations must recognize that such oversights can lead to severe security breaches if not addressed.
This vulnerability represents a broader trend in security, where default configurations often lead to exposure and exploitation. Security teams should take this incident as a lesson to enforce strict credential management policies.
Strategically, organizations should adopt a proactive approach to security that includes regular audits of configurations and credentials as well as engaging in continuous security testing practices. For further resources on security practices, organizations can refer to the following links: penetration testing methodology, vulnerability management program design, and continuous security testing best practices.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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