CVE-2023-28434: Github.com/minio/minio Privilege Escalation On Linux/MacOS Vulnerability

HIGH
Advisory Identifier: GHSA-2pxw-r47w-4p8c
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CVSS 8.8
CWE-269
Published
Advisory Summary

CVE-2023-28434 is a HIGH (CVSS 8.8) privilege escalation on linux/macos vulnerability (CWE-269: Improper Privilege Management) affecting Github.com/minio/minio libraries in the Go ecosystem. The issue involves privilege escalation on linux/macos. Remediation is available by upgrading affected packages to version 0.0.0-202303200415.

CVE-2023-28434 at a Glance

CVE Identifier CVE-2023-28434
GHSA Identifier GHSA-2pxw-r47w-4p8c
Severity HIGH
CVSS v3.1 Base Score 8.8
CWE Classification CWE-269: Improper Privilege Management
Affected Product Github.com/minio/minio
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 8.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2023-28434

To remediate this vulnerability, upgrade all affected Github.com/minio/minio dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/minio/minio fixed: 0.0.0-202303200415 
Upgrade github.com/minio/minio to 0.0.0-202303200415
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for github.com/minio/minio

How to Check if You Are Affected

To determine whether your application is affected by CVE-2023-28434, inspect your project dependencies for Github.com/minio/minio:

inspect dependencies for github.com/minio/minio

Analyze the terminal output to locate any version of Github.com/minio/minio in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.0.0-202303200415), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-269: Improper Privilege Management, where the product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. In Github.com/minio/minio, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### 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 <donatello@users.noreply.github.com> 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 } } // ... ```

CVE-2023-28434 Affected Github.com/minio/minio Versions

1 component(s)
Fixed Versions:
0.0.0-202303200415
Product / Package Ecosystem Affected Versions Fixed Version
github.com/minio/minio
golang/github.com/minio/minio
Go
< 0.0.0-202303200415
0.0.0-202303200415

References

GitHub Advisory / Wiki ADVISORY
https://github.com/minio/minio/security/advisories/GHSA-2pxw-r47w-4p8c
NVD — CVE-2023-28434 NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-28434
Github.com/minio/minio Source Repository REPOSITORY
https://github.com/minio/minio/pull/16849
Security Fix Commit FIX COMMIT
https://github.com/minio/minio/commit/67f4ba154a27a1b06e48bfabda38355a010dfca5
Github.com/minio/minio Source Repository REPOSITORY
https://github.com/minio/minio
www.cisa.gov/known-exploited-vul... WEB
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-28434

Frequently Asked Questions

What is CVE-2023-28434?
CVE-2023-28434 is a security vulnerability in Github.com/minio/minio involving Privilege Escalation on Linux/MacOS under CWE-269: Improper Privilege Management.
Which Github.com/minio/minio versions are affected?
Affected versions include releases prior to 0.0.0-202303200415 across affected packages: github.com/minio/minio.
What version fixes CVE-2023-28434?
Upgrading to 0.0.0-202303200415 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/minio/minio affected?
Yes, github.com/minio/minio is affected in releases prior to 0.0.0-202303200415. Upgrade your dependency to 0.0.0-202303200415 or later.
What is the CVSS score of CVE-2023-28434?
CVE-2023-28434 has a CVSS v3.1 base score of 8.8 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:H.
What CWE is associated with CVE-2023-28434?
CVE-2023-28434 is classified under CWE-269: Improper Privilege Management (The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.).
How can I check Go dependencies for CVE-2023-28434?
Run the dependency tree command: 'inspect dependencies for github.com/minio/minio'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-2pxw-r47w-4p8c",
  "modified" : "2025-10-22T19:20:02Z",
  "published" : "2023-09-05T15:45:10Z",
  "aliases" : [ "CVE-2023-28434" ],
  "summary" : "Privilege Escalation on Linux/MacOS",
  "details" : "### Impact\nAn 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.\n\n### Patches\n```\ncommit 67f4ba154a27a1b06e48bfabda38355a010dfca5\nAuthor: Aditya Manthramurthy <donatello@users.noreply.github.com>\nDate:   Sun Mar 19 21:15:20 2023 -0700\n\n    fix: post policy request security bypass (#16849)\n```\n\n### Workarounds\nBrowser API access must be enabled turning off `MINIO_BROWSER=off` allows for this workaround.\n\n### References\nThe vulnerable code:\n```go\n// minio/cmd/generic-handlers.go\nfunc setRequestValidityHandler(h http.Handler) http.Handler {\n  return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {\n    // ...\n    // For all other requests reject access to reserved buckets\n    bucketName, _ := request2BucketObjectName(r)\n    if isMinioReservedBucket(bucketName) || isMinioMetaBucket(bucketName) {\n      if !guessIsRPCReq(r) && !guessIsBrowserReq(r) && !guessIsHealthCheckReq(r) && !guessIsMetricsReq(r) && !isAdminReq(r) && !isKMSReq(r) {\n        if ok {\n          tc.FuncName = \"handler.ValidRequest\"\n          tc.ResponseRecorder.LogErrBody = true\n        }\n        writeErrorResponse(r.Context(), w, errorCodes.ToAPIErr(ErrAllAccessDisabled), r.URL)\n        return\n      }\n    }\n    // ...\n```",
  "severity" : [ {
    "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" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/minio/minio"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.0.0-202303200415"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/minio/minio/security/advisories/GHSA-2pxw-r47w-4p8c"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-28434"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/minio/minio/pull/16849"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/minio/minio/commit/67f4ba154a27a1b06e48bfabda38355a010dfca5"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/minio/minio"
  }, {
    "type" : "WEB",
    "url" : "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-28434"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-269" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-09-05T15:45:10Z",
    "nvd_published_at" : "2023-03-22T21:15:00Z"
  }
}