CVE-2024-1139: OCP Cluster Monitoring Information Leak Flaw

CVE-2024-1139 Overview

A credentials leak vulnerability was identified in the cluster monitoring operator component of Red Hat OpenShift Container Platform (OCP). This security flaw allows remote attackers with basic login credentials to inspect pod manifests and discover repository pull secrets, potentially leading to unauthorized access to container image registries and sensitive deployment resources.

Critical Impact

Authenticated attackers can extract repository pull secrets from pod manifests, enabling unauthorized access to private container registries and potentially exposing proprietary container images and configurations.

Affected Products

• Red Hat OpenShift Container Platform (OCP)
• OpenShift Cluster Monitoring Operator

Discovery Timeline

• April 25, 2024 - CVE-2024-1139 published to NVD
• November 21, 2024 - Last updated in NVD database

Technical Details for CVE-2024-1139

Vulnerability Analysis

This vulnerability falls under CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor). The cluster monitoring operator in OpenShift Container Platform improperly handles sensitive credential information within pod manifests. When authenticated users with basic cluster access query pod specifications, they can view repository pull secrets that should be restricted.

The vulnerability requires network access and low-privilege authentication, but once exploited, it can lead to the exposure of highly confidential information with a changed scope, meaning the impact extends beyond the vulnerable component itself. The attack can be executed without user interaction, making it particularly dangerous in multi-tenant Kubernetes environments where various users have legitimate but limited access to cluster resources.

Root Cause

The root cause stems from improper access control implementation in the cluster monitoring operator. Repository pull secrets, which should be masked or restricted based on user permissions, are inadvertently exposed in pod manifest specifications. This information disclosure occurs because the operator fails to properly sanitize sensitive credential data before presenting pod information to authenticated users with basic access rights.

Attack Vector

The attack leverages network-accessible APIs within OpenShift Container Platform. An attacker with basic login credentials can exploit this vulnerability by querying the Kubernetes API for pod manifests associated with the cluster monitoring operator. The attack flow involves:

1. The attacker authenticates to the OpenShift cluster with minimal privileges
2. The attacker queries pod specifications within the monitoring namespace
3. Repository pull secrets are exposed in the pod manifest response
4. The attacker extracts credentials to access private container registries

This vulnerability can be exploited through standard Kubernetes API calls using kubectl or the OpenShift CLI (oc). The exposed pull secrets may provide access to private container image repositories, allowing attackers to pull proprietary images or potentially push malicious containers if the credentials have write permissions.

Detection Methods for CVE-2024-1139

Indicators of Compromise

• Unusual API queries targeting pod manifests in the openshift-monitoring namespace
• Unexpected access patterns to cluster monitoring operator resources from low-privilege accounts
• Authentication events from unknown sources followed by immediate pod specification queries
• Anomalous container registry authentication attempts using cluster pull secrets

Detection Strategies

• Monitor Kubernetes audit logs for excessive GET requests to pod specifications in monitoring namespaces
• Implement alerting for API calls that retrieve imagePullSecrets from unauthorized service accounts
• Track container registry access logs for authentication attempts using cluster-associated credentials from external IP addresses
• Deploy runtime security monitoring to detect credential extraction patterns

Monitoring Recommendations

• Enable detailed audit logging for all Kubernetes API server operations
• Configure alerts for access to sensitive namespaces like openshift-monitoring from non-admin users
• Implement network-level monitoring for unusual outbound connections to container registries
• Review RBAC policies regularly to ensure minimal privilege assignment

How to Mitigate CVE-2024-1139

Immediate Actions Required

• Apply the latest security patches from Red Hat Security Advisories immediately
• Audit current RBAC configurations to restrict access to monitoring namespace resources
• Rotate any potentially exposed repository pull secrets
• Review access logs for signs of prior exploitation

Patch Information

Red Hat has released multiple security advisories addressing this vulnerability:

• Red Hat Security Advisory RHSA-2024:1887
• Red Hat Security Advisory RHSA-2024:1891
• Red Hat Security Advisory RHSA-2024:2047
• Red Hat Security Advisory RHSA-2024:2782

For detailed vulnerability information, refer to the Red Hat CVE-2024-1139 Information page and Red Hat Bug Report #2262158.

Workarounds

• Restrict RBAC permissions to prevent low-privilege users from accessing pod specifications in the openshift-monitoring namespace
• Implement network policies to limit API server access from untrusted network segments
• Use separate pull secrets per namespace to limit exposure scope if credentials are leaked
• Consider implementing admission controllers to audit and alert on sensitive resource access

# Example: Restrict access to monitoring namespace pods
oc adm policy remove-role-from-user view <username> -n openshift-monitoring

# Rotate compromised pull secrets
oc delete secret <pull-secret-name> -n openshift-monitoring
oc create secret docker-registry <pull-secret-name> \
  --docker-server=<registry-server> \
  --docker-username=<new-username> \
  --docker-password=<new-password> \
  -n openshift-monitoring