Vulnerability · Published Mar 8, 2021 · Assigned by GitHub_M

CVE-2021-21362Bypassing readOnly policy by creating a temporary 'mc share upload' URL

High 7.7

In plain English

A high-severity security flaw in minio from minio. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.3% (higher than 71% of all known vulnerabilities).

Severity (CVSS 3.1)7.7High

Exploit odds (30 days)1.3%top 29.0% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
minio	minio	< RELEASE.2021-03-04T00-53-13Z

Weakness: CWE-285 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N

References

https://github.com/minio/minio/security/advisories/GHSA-hq5j-6r98-9m8v x_refsource_CONFIRM
https://github.com/minio/minio/pull/11682 x_refsource_MISC
https://github.com/minio/minio/commit/039f59b552319fcc2f83631bb421a7d4b82bc482 x_refsource_MISC
https://github.com/minio/minio/releases/tag/RELEASE.2021-03-04T00-53-13Z x_refsource_MISC