Privilege Escalation on Linux/MacOS

{
  "id": "a5376347dd72211514eeb532311250567f09387c7939792216ab547f15195699",
  "url": "https://osv.dev/vulnerability/GHSA-2pxw-r47w-4p8c",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Privilege Escalation on Linux/MacOS",
    "summary": "### Impact 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. ### Patches ``` commit 67f4ba154a27a1b06e48bfabda38355a010dfca5 Author: Aditya Manthramurthy Date: Sun Mar 19 21:15:20 2023 -0700 fix: post policy request security bypass (#16849) ``` ### Workarounds Browser API access must be enabled turning off `MINIO_BROWSER=off` allows for this workaround. ### References The vulnerable code: ```go // minio/cmd/generic-handlers.go func setRequestValidityHandler(h http.Handler) http.Handler { return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { // ... // For all other requests reject access to reserved buckets bucketName, _ := request2BucketObjectName(r) if isMinioReservedBucket(bucketName) || isMinioMetaBucket(bucketName) { if !guessIsRPCReq(r) && !guessIsBrowserReq(r) && !guessIsHealthCheckReq(r) && !guessIsMetricsReq(r) && !isAdminReq(r) && !isKMSReq(r) { if ok { tc.FuncName = \"handler.ValidRequest\" tc.ResponseRecorder.LogErrBody = true } writeErrorResponse(r.Context(), w, errorCodes.ToAPIErr(ErrAllAccessDisabled), r.URL) return } } // ... ```",
    "evidence": "osv:GHSA-2pxw-r47w-4p8c",
    "products": [
      {
        "name": {
          "value": "github.com/minio/minio",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "0.0.0-202303200415",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "GHSA-2pxw-r47w-4p8c",
      "aliases": [
        "CVE-2023-28434",
        "GHSA-2pxw-r47w-4p8c"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0.0.0-202303200415"
                }
              ]
            }
          ],
          "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-2pxw-r47w-4p8c/GHSA-2pxw-r47w-4p8c.json"
          }
        }
      ],
      "modified": "2026-10-08T08:11:01.963531191Z",
      "provider": "osv",
      "references": [
        "https://github.com/minio/minio/security/advisories/GHSA-2pxw-r47w-4p8c",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-28434",
        "https://github.com/minio/minio/pull/16849",
        "https://github.com/minio/minio/commit/67f4ba154a27a1b06e48bfabda38355a010dfca5",
        "https://github.com/minio/minio",
        "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-28434"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-269"
        ],
        "severity": "HIGH",
        "github_reviewed": true,
        "nvd_published_at": "2023-03-22T21:15:00Z",
        "github_reviewed_at": "2023-09-05T15:45:10Z"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-28434",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 98759,
  "published_at": "2023-09-05T15:45:10+00:00"
}