CVE-2022-0567 in ovn-kubernetes
Summary
by MITRE • 04/20/2022
A flaw was found in ovn-kubernetes. This flaw allows a system administrator or privileged attacker to create an egress network policy that bypasses existing ingress policies of other pods in a cluster, allowing network traffic to access pods that should not be reachable. This issue results in information disclosure and other attacks on other pods that should not be reachable.
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Analysis
by VulDB Data Team • 04/27/2022
The vulnerability identified as CVE-2022-0567 resides within the ovn-kubernetes networking solution, which serves as a critical component for container network orchestration in Kubernetes environments. This flaw represents a significant security regression that undermines the fundamental network isolation principles that containerized applications depend upon. The issue specifically affects the egress network policy implementation within the OVN (Open Virtual Network) Kubernetes integration, where proper network segmentation mechanisms fail to function correctly. The vulnerability stems from inadequate validation and enforcement of network policy rules, creating a pathway for malicious actors to circumvent established security controls that should prevent unauthorized network access between pods.
The technical exploitation of this vulnerability occurs through the manipulation of egress network policies, which are designed to control outbound traffic from pods to external networks. When an attacker with system administrator privileges or elevated access creates a malicious egress policy, the system fails to properly validate whether this policy conflicts with existing ingress restrictions imposed on other pods within the same cluster. This validation failure results in a policy enforcement bypass where traffic can flow from a compromised pod to target pods that should be protected by ingress network policies. The flaw essentially allows traffic to traverse network boundaries that should remain isolated, creating a tunneling effect that undermines the entire pod security model. This represents a direct violation of the principle of least privilege and network segmentation that are fundamental to container security architectures.
The operational impact of CVE-2022-0567 extends beyond simple information disclosure to encompass a range of potential attacks that can severely compromise cluster integrity. An attacker exploiting this vulnerability can gain unauthorized access to sensitive workloads that should be isolated from other applications within the same cluster, potentially leading to data exfiltration, lateral movement, and privilege escalation attacks. The vulnerability affects the core network security controls that organizations rely upon to maintain security boundaries between different applications and services. This weakness can enable attackers to bypass traditional network monitoring and detection mechanisms, as the traffic flows appear to be legitimate egress traffic rather than malicious infiltration attempts. The issue particularly impacts environments where strict network policies are enforced to separate development, staging, and production workloads, as the bypass allows unauthorized access between these security zones.
Organizations utilizing ovn-kubernetes deployments should immediately implement mitigations that address the root cause of this vulnerability through proper policy validation and enforcement mechanisms. The recommended approach involves updating to patched versions of ovn-kubernetes that correct the egress policy validation logic and ensure proper enforcement of network isolation rules. Network administrators should conduct comprehensive audits of existing network policies to identify and remediate any configurations that might be susceptible to this bypass attack. Additional defensive measures include implementing network monitoring solutions that can detect anomalous traffic patterns between pods that violate established network policy boundaries, as well as deploying runtime security tools that can identify and block unauthorized network access attempts. This vulnerability aligns with CWE-284 Access Control Bypass and maps to ATT&CK technique T1046 Network Service Scanning and T1566 Phishing, as it enables attackers to expand their network reach and access sensitive targets through bypassed security controls. Organizations should also consider implementing additional network segmentation strategies and zero-trust network access principles to minimize the impact of such vulnerabilities in their environments.