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CVE-2023-28434

MinIO Security Feature Bypass

8.8 HIGHActively exploited (CISA KEV)Public exploitEPSS 7.92%
  1. Published22 Mar 2023
  2. Added to CISA KEV19 Sept 2023
  3. Remediation due10 Oct 2023
Actively exploited (CISA KEV)

MinIO contains a security feature bypass vulnerability that allows an attacker to use crafted requests to bypass metadata bucket name checking and put an object into any bucket while processing `PostPolicyBucket` to conduct privilege escalation. To carry out this attack, the attacker requires credentials with `arn:aws:s3:::*` permission, as well as enabled Console API access.

Added to KEV: 19 Sept 2023Federal remediation due: 10 Oct 2023

Description

Minio 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`.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

Minio< 2023-03-20t20-16-18z

Remediation

Fixed in
Minio≥ 2023-03-20t20-16-18z

References

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Frequently asked

Is CVE-2023-28434 being actively exploited?

Yes. CVE-2023-28434 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 19 Sept 2023.

How severe is CVE-2023-28434?

CVE-2023-28434 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 7.92% probability of exploitation.

Which products are affected by CVE-2023-28434?

Affected products include Minio.

How do I fix CVE-2023-28434?

Upgrade affected software to a fixed version, for example Minio 2023-03-20t20-16-18z or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2023-28434 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.