Minio vulnerable to Privilege Escalation on Windows via Path separator manipulation

{
  "id": "f8e833c6d5af4d80af71216a10713257348a42f8da5bd931620ccfc7419744d3",
  "url": "https://osv.dev/vulnerability/GHSA-w23q-4hw3-2pp6",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Minio vulnerable to Privilege Escalation on Windows via Path separator manipulation",
    "summary": "### Impact All users on Windows are impacted. MinIO fails to filter the `\\` character, which allows for arbitrary object placement across buckets. As a result, a user with low privileges, such as an access key, service account, or STS credential, which only has permission to `PutObject` in a specific bucket, can create an admin user. ### Patches There are two patches that fix this problem comprehensively ``` commit b3c54ec81e0a06392abfb3a1ffcdc80c6fbf6ebc Author: Harshavardhana Date: Mon Mar 20 13:16:00 2023 -0700 reject object names with '\\' on windows (#16856) ``` ``` commit 8d6558b23649f613414c8527b58973fbdfa4d1b8 Author: Harshavardhana Date: Mon Mar 20 00:35:25 2023 -0700 fix: convert '\\' to '/' on windows (#16852) ``` ### Workarounds There are no known workarounds ### References The vulnerable code: ```go // minio/cmd/generic-handlers.go // Check if the incoming path has bad path components, // such as \"..\" and \".\" // SlashSeparator -> / // dotdotComponent -> .. // dotComponent -> . func hasBadPathComponent(path string) bool { path = strings.TrimSpace(path) for _, p := range strings.Split(path, SlashSeparator) { switch strings.TrimSpace(p) { case dotdotComponent: return true case dotComponent: return true } } return false } ```",
    "evidence": "osv:GHSA-w23q-4hw3-2pp6",
    "products": [
      {
        "name": {
          "value": "github.com/minio/minio",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "0.0.0-202303200735",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "GHSA-w23q-4hw3-2pp6",
      "aliases": [
        "CVE-2023-28433",
        "GHSA-w23q-4hw3-2pp6"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0.0.0-202303200735"
                }
              ]
            }
          ],
          "package": {
            "name": "github.com/minio/minio",
            "purl": "pkg:golang/github.com/minio/minio",
            "ecosystem": "Go"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/09/GHSA-w23q-4hw3-2pp6/GHSA-w23q-4hw3-2pp6.json"
          }
        }
      ],
      "modified": "2026-10-08T08:11:02.392575410Z",
      "provider": "osv",
      "references": [
        "https://github.com/minio/minio/security/advisories/GHSA-w23q-4hw3-2pp6",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-28433",
        "https://github.com/minio/minio/commit/8d6558b23649f613414c8527b58973fbdfa4d1b8",
        "https://github.com/minio/minio/commit/b3c54ec81e0a06392abfb3a1ffcdc80c6fbf6ebc",
        "https://github.com/minio/minio",
        "https://github.com/minio/minio/releases/tag/RELEASE.2023-03-20T20-16-18Z"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-668"
        ],
        "severity": "HIGH",
        "github_reviewed": true,
        "nvd_published_at": "2023-03-22T21:15:00Z",
        "github_reviewed_at": "2023-09-06T18:43:13Z"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-28433",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 98767,
  "published_at": "2023-09-06T18:43:13+00:00"
}