A flaw was found in CRI-O that involves an experimental annotation leading to a container being unconfined. This may allow a pod to specify and get any amount of memory/cpu, circumventing the kubernetes scheduler and potentially resulting in a denial of service in the node. With a CVSS score of 6.5, the vulnerability is classified as medium severity. This presents a real risk to organizations utilizing affected versions of Red Hat OpenShift Container Platform.
The vulnerability is particularly concerning as it can bypass resource constraints imposed by Kubernetes, potentially leading to service disruptions. Organizations must take immediate action to evaluate their deployments and apply relevant patches or mitigations.
As of the latest information, there are no known exploits or public proof of concepts available for this vulnerability. However, given its implications, organizations should prioritize patching immediately.
In light of the potential for denial of service, addressing this vulnerability should be part of an organization’s priority patch cycle.
Vulnerability Details
CVE-2023-6476 affects the Red Hat OpenShift Container Platform, specifically versions 3.11, 4.13, and 4.14. The vulnerability arises from an experimental feature in CRI-O that fails to enforce resource limitations, which is critical for maintaining stability in containerized environments. The vulnerability has been assigned a CVSS score of 6.5, indicating a medium severity level.
The CVSS vector indicates that the attack vector is network-based, with low complexity, requiring low privileges and no user interaction. The availability impact is rated high, meaning successful exploitation could lead to significant disruptions.
Technical Analysis
The root cause of this vulnerability is related to the experimental annotation in CRI-O, which, when mishandled, allows pods to request unbounded resources. This misconfiguration can result in a denial of service as it undermines the Kubernetes scheduler's ability to manage resource allocation effectively.
The attack vector for this vulnerability is network-based, meaning that an attacker could initiate exploitation from a remote location. The complexity of the attack is rated as low, indicating it could be executed without significant technical barriers. Privileges required are low, as an attacker does not need elevated rights to exploit this flaw.
There is no requirement for user interaction, allowing an attacker to exploit the vulnerability without needing any action from the target. The impact on availability is high, which raises the stakes for organizations relying on affected versions of OpenShift.
Risk & Impact Analysis
Risk to organizations includes significant potential for denial of service if an attacker successfully exploits this vulnerability. Given that the vulnerability allows for resource exhaustion, it can lead to system downtime, affecting business operations and reliability.
Organizations must assess their deployment risk, particularly those using the affected versions of OpenShift Container Platform. The availability impact being rated as high means that the consequences of this vulnerability could be severe, necessitating a prompt response.
With a medium CVSS score, organizations should address this vulnerability in their priority patch cycle to mitigate potential risks associated with service disruptions.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The following versions of Red Hat OpenShift Container Platform are affected by CVE-2023-6476: 3.11, 4.13, and 4.14. Organizations using these versions should monitor for updates and apply necessary patches.
Mitigation & Remediation
To mitigate this vulnerability, organizations should patch their systems to the latest version of OpenShift Container Platform as recommended by Red Hat. Regular updates are crucial to ensure systems are not vulnerable to known issues. Organizations may also consider implementing network controls and monitoring configurations to detect unusual resource usage patterns.
For further assistance, organizations can refer to our penetration testing services to validate the effectiveness of their security posture.
Detection Guidance
Organizations should monitor their systems for unusual memory and CPU usage that could indicate exploitation attempts related to this vulnerability. Log indicators such as pod creation and resource requests should be analyzed to detect potential misuse of the experimental annotation feature in CRI-O.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2023-6476 lies in its demonstration of how experimental features can inadvertently introduce vulnerabilities that bypass core functionalities of container orchestration platforms like Kubernetes. Security teams should learn from this incident to validate the security of experimental features before deployment.
This vulnerability highlights the need for comprehensive risk assessments during feature development and deployment phases. Organizations should consider regular reviews and audits of their container configurations to ensure resource limitations are strictly enforced.
For further reading on security best practices, organizations can explore our vulnerability management program and the importance of proactive security assessments.
In addition, organizations can benefit from understanding the nuances of penetration testing methodology to ensure a robust security posture against vulnerabilities like this.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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