MITM modification of request bodies in MinIO

{
  "id": "62bc499c8d0c9105aa7f8f172dbf3e66381e9cfc1dfbb53325c6920693377cbc",
  "url": "https://osv.dev/vulnerability/BIT-minio-2021-21390",
  "method": "structured",
  "payload": {
    "kind": "withdrawal",
    "title": "MITM modification of request bodies in MinIO",
    "summary": "MinIO is an open-source high performance object storage service and it is API compatible with Amazon S3 cloud storage service. In MinIO before version RELEASE.2021-03-17T02-33-02Z, there is a vulnerability which enables MITM modification of request bodies that are meant to have integrity guaranteed by chunk signatures. In a PUT request using aws-chunked encoding, MinIO ordinarily verifies signatures at the end of a chunk. This check can be skipped if the client sends a false chunk size that is much greater than the actual data sent: the server accepts and completes the request without ever reaching the end of the chunk + thereby without ever checking the chunk signature. This is fixed in version RELEASE.2021-03-17T02-33-02Z. As a workaround one can avoid using \"aws-chunked\" encoding-based chunk signature upload requests instead use TLS. MinIO SDKs automatically disable chunked encoding signature when the server endpoint is configured with TLS.",
    "evidence": "osv:BIT-minio-2021-21390",
    "products": [
      {
        "name": {
          "value": "minio",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2021.03.17",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "BIT-minio-2021-21390",
      "aliases": [
        "BIT-minio-2021-21390"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2021.03.17"
                }
              ]
            }
          ],
          "package": {
            "name": "minio",
            "purl": "pkg:bitnami/minio",
            "ecosystem": "Bitnami"
          },
          "severity": [
            {
              "type": "CVSS_V3",
              "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N"
            }
          ],
          "database_specific": {
            "source": "https://github.com/bitnami/vulndb/tree/main/data/minio/BIT-minio-2021-21390.json"
          }
        }
      ],
      "modified": "2026-10-08T08:11:02.807590441Z",
      "provider": "osv",
      "references": [
        "https://github.com/minio/minio/commit/e197800f9055489415b53cf137e31e194aaf7ba0",
        "https://github.com/minio/minio/pull/11801",
        "https://github.com/minio/minio/security/advisories/GHSA-xr7r-7gpj-5pgp",
        "https://nvd.nist.gov/vuln/detail/CVE-2021-21390"
      ],
      "provider_metadata": {
        "cpes": [
          "cpe:2.3:a:minio:minio:*:*:*:*:*:*:*:*"
        ],
        "severity": "Medium"
      }
    },
    "related_cves": [],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 98775,
  "published_at": "2024-03-06T10:58:02.168+00:00"
}