CVE-2021-3586 in servicemesh-operator
Summary
by MITRE • 08/22/2022
A flaw was found in servicemesh-operator. The NetworkPolicy resources installed for Maistra do not properly specify which ports may be accessed, allowing access to all ports on these resources from any pod. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
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Analysis
by VulDB Data Team • 09/24/2022
The vulnerability identified as CVE-2021-3586 affects the servicemesh-operator component within the Maistra service mesh implementation, representing a critical network security flaw that undermines the fundamental principles of network segmentation and access control. This vulnerability resides in the improper configuration of NetworkPolicy resources that are automatically deployed as part of the Maistra service mesh installation process, creating a significant security gap in containerized environments that rely on strict network boundaries for protecting sensitive workloads and data.
The technical flaw manifests in the misconfiguration of NetworkPolicy objects that are designed to enforce network access controls between pods within a Kubernetes cluster. Specifically, the servicemesh-operator fails to properly define the port specifications within these NetworkPolicy resources, resulting in an overly permissive configuration that allows any pod within the cluster to access all network ports on the affected resources. This misconfiguration violates the principle of least privilege and creates an attack surface that can be exploited by malicious actors seeking to gain unauthorized access to services running within the mesh. The vulnerability is classified as a weakness in network access control mechanisms and aligns with CWE-284, which addresses improper access control in network security contexts.
The operational impact of this vulnerability extends beyond simple network connectivity issues and presents a substantial threat to data confidentiality, integrity, and system availability within affected environments. Attackers who can gain access to any pod within the cluster can potentially exploit this flaw to discover and access services running on any port, including those that should be restricted to specific internal communication channels. This exposure can lead to data breaches, unauthorized service access, and potential system compromise, particularly when sensitive applications or databases are running within the service mesh environment. The vulnerability affects the core security model of the service mesh, undermining the trust boundaries that are essential for maintaining security in microservices architectures. From an attack perspective, this flaw maps to several ATT&CK techniques including T1046 for network service scanning and T1071 for application layer protocol usage, making it a significant concern for organizations implementing zero-trust security models.
Organizations affected by this vulnerability should immediately implement mitigations that include manual review and correction of NetworkPolicy configurations, ensuring that all port specifications are properly defined and restricted to legitimate service communication requirements. The recommended remediation approach involves verifying that NetworkPolicy resources explicitly define the necessary ports for service communication while blocking access to unnecessary ports, effectively closing the gap created by the operator's default configuration. Additionally, security teams should conduct comprehensive network access audits to identify any other improperly configured network policies that may present similar vulnerabilities. Regular monitoring and automated validation of NetworkPolicy configurations should be implemented to prevent future occurrences of such misconfigurations, and organizations should consider implementing network segmentation controls that operate independently of operator configurations to provide additional layers of security protection.