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[ CVE-2023-28434 · Published 22 Mar 2023 ]

MinIO Security Feature Bypass Vulnerability

Exploited · CISA KEV CVSS 8.8 EPSS 8%Fix available

[ Why it matters ]Priority signals

  • Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2023-09-19

[ Description ]Official description

Minio is a Multi-Cloud Object Storage framework. Prior to RELEASE.2023-03-20T20-16-18Z, an attacker can use crafted requests to bypass metadata bucket name checking and put an object into any bucket while processing `PostPolicyBucket`. To carry out this attack, the attacker requires credentials with `arn:aws:s3:::*` permission, as well as enabled Console API access. This issue has been patched in RELEASE.2023-03-20T20-16-18Z. As a workaround, enable browser API access and turn off `MINIO_BROWSER=off`.

CISA: MinIO contains a security feature bypass vulnerability that allows an attacker to use crafted requests to bypass metadata bucket name checking and put an object into any bucket while processing `PostPolicyBucket` to conduct privilege escalation. To carry out this attack, the attacker requires credentials with `arn:aws:s3:::*` permission, as well as enabled Console API access.

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 10 Oct 2023): Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

[ References ]References