CVE-2021-21390

Published on: 03/19/2021 12:00:00 AM UTC

Last Modified on: 03/25/2021 08:29:00 PM UTC

CVE-2021-21390 - advisory for GHSA-xr7r-7gpj-5pgp

Source: Mitre Source: Nist Print: PDF PDF
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Certain versions of Minio from Minio contain the following vulnerability:

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.

  • CVE-2021-21390 has been assigned by URL Logo [email protected] to track the vulnerability - currently rated as MEDIUM severity.
  • Affected Vendor/Software: URL Logo minio - minio version < RELEASE.2021-03-17T02-33-02Z

CVSS3 Score: 5.9 - MEDIUM

Attack
Vector
Attack
Complexity
Privileges
Required
User
Interaction
NETWORK HIGH NONE NONE
Scope Confidentiality
Impact
Integrity
Impact
Availability
Impact
UNCHANGED NONE HIGH NONE

CVSS2 Score: 4.3 - MEDIUM

Access
Vector
Access
Complexity
Authentication
NETWORK MEDIUM NONE
Confidentiality
Impact
Integrity
Impact
Availability
Impact
NONE PARTIAL NONE

CVE References

Description Tags Link
Chunked body signature check not always applied · Advisory · minio/minio · GitHub github.com
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URL Logo CONFIRM github.com/minio/minio/security/advisories/GHSA-xr7r-7gpj-5pgp
s3v4: read and verify S3 signature v4 chunks separately by aead · Pull Request #11801 · minio/minio · GitHub github.com
text/html
URL Logo MISC github.com/minio/minio/pull/11801
s3v4: read and verify S3 signature v4 chunks separately (#11801) · minio/[email protected] · GitHub github.com
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URL Logo MISC github.com/minio/minio/commit/e197800f9055489415b53cf137e31e194aaf7ba0

Known Affected Configurations (CPE V2.3)

Type Vendor Product Version Update Edition Language
ApplicationMinioMinioAllAllAllAll
  • cpe:2.3:a:minio:minio:*:*:*:*:*:*:*:*:
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