Kubernetes NodeRestriction Vulnerability Allows Nodes to Bypass Resource Allocation Checks
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A newly disclosed vulnerability in Kubernetes has been identified that could allow compromised nodes to bypass critical authorization checks within the container orchestration platform.
The security flaw, tracked as CVE-2025-4563, affects the NodeRestriction admission controller and poses potential risks for organizations utilizing dynamic resource allocation features in their Kubernetes clusters.
Summary 1. Kubernetes NodeRestriction controller vulnerability allows bypassing dynamic resource allocation checks. 2. Compromised nodes can create unauthorized mirror pods, enabling privilege escalation attacks. 3. Kubernetes versions 1.32.0-1.32.5 and 1.33.0-1.33.1 are vulnerable. 4. Upgrade immediately to versions 1.32.6 or 1.33.2.
Kubernetes Privilege Escalation Flaw
The vulnerability resides within Kubernetes’ NodeRestriction admission controller, a critical security component designed to restrict the actions that kubelet processes can perform on node and pod objects.
When the DynamicResourceAllocation feature gate is enabled, the controller exhibits inconsistent validation behavior that creates a significant security gap.
According to the GitHubadvisory,the flaw manifests during pod lifecycle management operations. While the NodeRestriction controller properly validates resource claim statuses during pod status updates, it fails to perform equivalent validation checks during the initial pod creation process.
This validation inconsistency creates an exploitable window, allowing malicious actors with compromised node access to manipulate the system.
A successful exploitation allows attackers to create mirror pods that can access unauthorized dynamic resources within the cluster.
The kubelet typically uses mirror pods to represent static pods in the API server, but in this context, they become vehicles for privilege escalation attacks.
The vulnerability carries a CVSS v3 base score of 2.7, categorizing it as low severity, though the potential for privilege escalation makes it a concern for security-conscious organizations.
Risk Factors Details Affected ProductsKubernetes versions 1.32.0-1.32.5 and 1.33.0-1.33.1ImpactPrivilege escalationExploit Prerequisites– High privileges required- Compromised node access- DynamicResourceAllocation feature gate enabled- Network access to clusterCVSS 3.1 Score2.7 (Low Severity)
Affected Versions
The vulnerability impacts specific Kubernetes version ranges, affecting clusters running versions 1.32.0 through 1.32.5 and 1.33.0 through 1.33.1.
Organizations operating within these version ranges are potentially vulnerable to exploitation, particularly those with the DynamicResourceAllocation feature enabled.
The technical root cause lies in the CWE-863 weakness classification, which relates to incorrect authorization implementations.
The NodeRestriction admission controller’s inconsistent validation logic creates a bypass mechanism that undermines the intended security boundaries between nodes and cluster resources.
This issue specifically affects environments where dynamic resource allocation is utilized for advanced workload management and resource optimization.
The vulnerability’s network-based attack vector requires high privileges for exploitation, which somewhat limits its immediate threat potential.
However, in scenarios where node compromise has already occurred, this vulnerability could serve as an escalation pathway for attackers seeking expanded cluster access.
Mitigations
Kubernetes maintainers have addressed this vulnerability through targeted patches released in versions 1.32.6 and 1.33.2.
Organizations should prioritize upgrading their clusters to these patched versions to eliminate the security risk.
System administrators should immediately audit their cluster configurations to determine if the DynamicResourceAllocation feature gate is enabled and assess their exposure risk.
Additionally, implementing robust Pod Security Standards and maintaining comprehensive audit logging can help detect potential exploitation attempts.
The Kubernetes Security Team has published detailed advisories through their official security announcement channels, providing specific guidance for cluster operators.
Organizations should establish regular vulnerability monitoring processes and maintain updated cluster deployments to prevent future security exposures.
#Cyber_Security #Cyber_Security_News #Vulnerability #cyber_security #cyber_security_news #vulnerability
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Kubernetes NodeRestriction Vulnerability Allows Nodes to Bypass Resource Allocation Checks
Author: KaaviyaA newly disclosed vulnerability in Kubernetes has been identified that could allow compromised nodes to bypass critical authorization checks within the container orchestration platform.
The security flaw, tracked as CVE-2025-4563, affects the NodeRestriction admission controller and poses potential risks for organizations utilizing dynamic resource allocation features in their Kubernetes clusters.
Summary 1. Kubernetes NodeRestriction controller vulnerability allows bypassing dynamic resource allocation checks. 2. Compromised nodes can create unauthorized mirror pods, enabling privilege escalation attacks. 3. Kubernetes versions 1.32.0-1.32.5 and 1.33.0-1.33.1 are vulnerable. 4. Upgrade immediately to versions 1.32.6 or 1.33.2.
Kubernetes Privilege Escalation Flaw
The vulnerability resides within Kubernetes’ NodeRestriction admission controller, a critical security component designed to restrict the actions that kubelet processes can perform on node and pod objects.
When the DynamicResourceAllocation feature gate is enabled, the controller exhibits inconsistent validation behavior that creates a significant security gap.
According to the GitHubadvisory,the flaw manifests during pod lifecycle management operations. While the NodeRestriction controller properly validates resource claim statuses during pod status updates, it fails to perform equivalent validation checks during the initial pod creation process.
This validation inconsistency creates an exploitable window, allowing malicious actors with compromised node access to manipulate the system.
A successful exploitation allows attackers to create mirror pods that can access unauthorized dynamic resources within the cluster.
The kubelet typically uses mirror pods to represent static pods in the API server, but in this context, they become vehicles for privilege escalation attacks.
The vulnerability carries a CVSS v3 base score of 2.7, categorizing it as low severity, though the potential for privilege escalation makes it a concern for security-conscious organizations.
Risk Factors Details Affected ProductsKubernetes versions 1.32.0-1.32.5 and 1.33.0-1.33.1ImpactPrivilege escalationExploit Prerequisites– High privileges required- Compromised node access- DynamicResourceAllocation feature gate enabled- Network access to clusterCVSS 3.1 Score2.7 (Low Severity)
Affected Versions
The vulnerability impacts specific Kubernetes version ranges, affecting clusters running versions 1.32.0 through 1.32.5 and 1.33.0 through 1.33.1.
Organizations operating within these version ranges are potentially vulnerable to exploitation, particularly those with the DynamicResourceAllocation feature enabled.
The technical root cause lies in the CWE-863 weakness classification, which relates to incorrect authorization implementations.
The NodeRestriction admission controller’s inconsistent validation logic creates a bypass mechanism that undermines the intended security boundaries between nodes and cluster resources.
This issue specifically affects environments where dynamic resource allocation is utilized for advanced workload management and resource optimization.
The vulnerability’s network-based attack vector requires high privileges for exploitation, which somewhat limits its immediate threat potential.
However, in scenarios where node compromise has already occurred, this vulnerability could serve as an escalation pathway for attackers seeking expanded cluster access.
Mitigations
Kubernetes maintainers have addressed this vulnerability through targeted patches released in versions 1.32.6 and 1.33.2.
Organizations should prioritize upgrading their clusters to these patched versions to eliminate the security risk.
System administrators should immediately audit their cluster configurations to determine if the DynamicResourceAllocation feature gate is enabled and assess their exposure risk.
Additionally, implementing robust Pod Security Standards and maintaining comprehensive audit logging can help detect potential exploitation attempts.
The Kubernetes Security Team has published detailed advisories through their official security announcement channels, providing specific guidance for cluster operators.
Organizations should establish regular vulnerability monitoring processes and maintain updated cluster deployments to prevent future security exposures.
#Cyber_Security #Cyber_Security_News #Vulnerability #cyber_security #cyber_security_news #vulnerability
Оригинальная версия на сайте:
