CVE-2021-21362: Bypassing readOnly policy by creating a temporary 'mc share upload' URL
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 Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2021-21362?
CVE-2021-21362 has been classified as a medium severity vulnerability due to the potential bypass of the readOnly policy.
How do I fix CVE-2021-21362?
To mitigate CVE-2021-21362, upgrade MinIO to a version later than RELEASE.2021-03-04T00-53-13Z.
What systems are affected by CVE-2021-21362?
CVE-2021-21362 affects all versions of MinIO prior to RELEASE.2021-03-04T00-53-13Z.
What vulnerability does CVE-2021-21362 address?
CVE-2021-21362 addresses the issue of bypassing a readOnly policy by creating temporary 'mc share upload' URLs.
Is CVE-2021-21362 related to any specific MinIO functionality?
CVE-2021-21362 is specifically related to the sharing and uploading functionality within MinIO.