CVE-2023-28432 in Minio
Summary
by MITRE • 03/22/2023
Minio is a Multi-Cloud Object Storage framework. In a cluster deployment starting with RELEASE.2019-12-17T23-16-33Z and prior to RELEASE.2023-03-20T20-16-18Z, MinIO returns all environment variables, including `MINIO_SECRET_KEY` and `MINIO_ROOT_PASSWORD`, resulting in information disclosure. All users of distributed deployment are impacted. All users are advised to upgrade to RELEASE.2023-03-20T20-16-18Z.
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Analysis
by VulDB Data Team • 09/09/2024
The vulnerability identified as CVE-2023-28432 affects MinIO object storage systems deployed in cluster mode, specifically impacting versions released between December 17, 2019 and March 20, 2023. This information disclosure flaw represents a critical security weakness that exposes sensitive authentication credentials through the system's API responses. The vulnerability manifests when MinIO cluster deployments return environment variables containing the MINIO_SECRET_KEY and MINIO_ROOT_PASSWORD values in their responses, creating a direct pathway for unauthorized access to the storage infrastructure.
The technical implementation of this vulnerability stems from improper handling of environment variable exposure within MinIO's distributed deployment architecture. When the system processes API requests, it inadvertently includes sensitive credential information in its response payloads, violating fundamental security principles of least privilege and information hiding. This flaw operates at the application layer and affects all distributed MinIO deployments, making it particularly dangerous as it impacts the entire cluster rather than individual nodes. The vulnerability's persistence across multiple releases indicates a systemic issue in the codebase's credential management and response sanitization mechanisms.
The operational impact of this vulnerability extends beyond simple credential exposure, creating substantial risk for organizations relying on MinIO for their object storage needs. Attackers who can access the exposed environment variables gain immediate access to the system's root credentials, enabling them to perform administrative operations including creating new users, modifying access policies, and potentially exfiltrating all stored data. This information disclosure vulnerability directly maps to CWE-200 (Information Exposure) and aligns with ATT&CK technique T1552.001 (Credentials In Files) and T1078.004 (Valid Accounts: Cloud Accounts). The exposure of MINIO_SECRET_KEY specifically compromises the system's encryption key management, while MINIO_ROOT_PASSWORD provides full administrative access to the entire storage cluster.
Organizations utilizing MinIO in distributed mode must immediately implement mitigation strategies to address this vulnerability. The primary recommendation involves upgrading to the patched release version RELEASE.2023-03-20T20-16-18Z, which contains the necessary code modifications to prevent environment variable exposure. Additionally, system administrators should conduct comprehensive audits of their MinIO deployments to identify any potential credential exposure that may have occurred prior to the upgrade. Network segmentation and access control measures should be strengthened to limit exposure even if credentials are compromised. Security monitoring should be enhanced to detect unauthorized access attempts and credential harvesting activities. Organizations should also consider implementing credential rotation procedures for all MinIO systems and establish automated compliance checking to ensure all deployments remain current with security patches. The vulnerability demonstrates the critical importance of proper credential handling in distributed systems and the potential for widespread impact when such security measures fail.