CVE-2021-21390

Vulnerability 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.2021-03-17T02-33-02Z, there is a vulnerability which enables MITM modification of request bodies that are meant to have integrity guaranteed by chunk signatures. In a PUT request using aws-chunked encoding, MinIO ordinarily verifies signatures at the end of a chunk. This check can be skipped if the client sends a false chunk size that is much greater than the actual data sent: the server accepts and completes the request without ever reaching the end of the chunk + thereby without ever checking the chunk signature. This is fixed in version RELEASE.2021-03-17T02-33-02Z. As a workaround one can avoid using "aws-chunked" encoding-based chunk signature upload requests instead use TLS. MinIO SDKs automatically disable chunked encoding signature when the server endpoint is configured with TLS.

CVSS Score

Affected Products

Related Weaknesses (CWE)

References

• https://github.com/minio/minio/commit/e197800f9055489415b53cf137e31e194aaf7ba0ExploitPatchThird Party Advisory
• https://github.com/minio/minio/pull/11801ExploitPatchThird Party Advisory
• https://github.com/minio/minio/security/advisories/GHSA-xr7r-7gpj-5pgpExploitPatchThird Party Advisory
• https://github.com/minio/minio/commit/e197800f9055489415b53cf137e31e194aaf7ba0ExploitPatchThird Party Advisory
• https://github.com/minio/minio/pull/11801ExploitPatchThird Party Advisory
• https://github.com/minio/minio/security/advisories/GHSA-xr7r-7gpj-5pgpExploitPatchThird Party Advisory