CVE-2023-28434
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedMinio 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`.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceMinio prior to RELEASE.2023-03-20T20-16-18Z contains a bypass in the PostPolicyBucket handler where metadata bucket name checking is insufficient, allowing an authenticated attacker with `arn:aws:s3:::*` permission and Console API access to write objects into buckets they shouldn't have access to.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 2023-03-20t20-16-18zCVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Check MinIO server versionRun `minio version` or query the MinIO server's /minio/health/live or /minio/health/ready endpoint, or inspect the output of `minio admin info`Affected if The reported version is earlier than RELEASE.2023-03-20T20-16-18Z
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Verify PostPolicyBucket is in useReview application logs and configurations for use of the PostPolicyBucket API (also known as presigned POST policy) for object uploadsAffected if The MinIO deployment uses PostPolicyBucket/presigned POST policy for object uploads
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Identify users with broad S3 permissionsRun `mc admin policy list` (if mc is installed) or query MinIO IAM APIs to enumerate user policies, looking for policies containing `arn:aws:s3:::*` permissionAffected if Any IAM user or service account has a policy granting `arn:aws:s3:::*` (wildcard) permissions across all buckets
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Confirm Console API accessibilityCheck if the MinIO Browser/Console is reachable at the default port 9000 or configured endpoint, and verify the MINIO_BROWSER environment variable setting if accessibleAffected if The MinIO Console API is accessible and the deployment uses the vulnerable code path for PostPolicyBucket processing
A user is affected if their MinIO version is before RELEASE.2023-03-20T20-16-18Z AND they use PostPolicyBucket with users that have broad `arn:aws:s3:::*` permissions while the Console API is accessible.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped2023-03-20t20-16-18z
Upgrade Minio to RELEASE.2023-03-20T20-16-18Z or later. As a workaround, ensure the browser API is enabled (do not set MINIO_BROWSER=off).
RELEASE.2023-03-20T20-16-18Z
- Upgrade Minio to RELEASE.2023-03-20T20-16-18Z or later release version
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation1.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-28434 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2023-28434 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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