Auth bypass in Minio
CVE-2021-21362
MinIO is an open-source high performance object storage service and it is API compatible with Amazon S3 cloud storage service. In MinIO before version RELEASE.2021-03-04T00-53-13Z it is possible to bypass a readOnly policy by creating a temporary 'mc share upload' URL. Everyone is impacted who uses MinIO multi-users. This is fixed in version RELEASE.2021-03-04T00-53-13Z. As a workaround, one can disable uploads with `Content-Type: multipart/form-data` as mentioned in the S3 API RESTObjectPOST docs by using a proxy in front of MinIO.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.013 (69.7th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 70th percentile — 69.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000
Affected products
- Minio — versions < RELEASE.2021-03-04T00-53-13Z
Weakness classification (CWE)
References
- github.com/minio/minio/security/advisories/GHSA-hq5j-6r98-9m8v (Third Party Advisory)
- github.com/minio/minio/pull/11682 (Exploit, Third Party Advisory)
- github.com/minio/minio/commit/039f59b552319fcc2f83631bb421a7d4b82bc482 (Patch, Third Party Advisory)
- github.com/minio/minio/releases/tag/RELEASE.2021-03-04T00-53-13Z (Third Party Advisory, Release Notes)
Frequently asked questions
- What is CVE-2021-21362?
- CVE-2021-21362 is a high-severity vulnerability in Minio, classified under Improper Authorization. CVSS score: 7.7/10. Published 2021-03-08.
- How severe is CVE-2021-21362?
- High severity. CVSS v3 base score is 7.7 out of 10.