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CVE-2021-21390— MITM modification of request bodies in MinIO

Quick assessment

Affected
minio minio
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Minio MinIO是美国MinIO（Minio）公司的一款开源的对象存储服务器。该产品支持构建用于机器学习、分析和应用程序数据工作负载的基础架构。 MinIO 存在安全漏洞，该漏洞允许MITM修改请求体，跳过此检查。

CVSS 6.5 · Medium EPSS 0.85% · P57
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I. Basic Information for CVE-2021-21390

Vulnerability Information
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Vulnerability Title
MITM modification of request bodies in MinIO
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通信信道中传输过程中消息完整性的不正确执行
Source: CVE Program / CVE List V5
Vulnerability Title
Minio MinIO 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Minio MinIO是美国MinIO（Minio）公司的一款开源的对象存储服务器。该产品支持构建用于机器学习、分析和应用程序数据工作负载的基础架构。 MinIO 存在安全漏洞，该漏洞允许MITM修改请求体，跳过此检查。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
minio minio < RELEASE.2021-03-17T02-33-02Z -

II. Public POCs for CVE-2021-21390

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III. Intelligence Information for CVE-2021-21390

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Patches & Fixes for CVE-2021-21390 (2)

Vendor Advisories for CVE-2021-21390 (1)

IV. Related Vulnerabilities

Same product: minio
Same vendor: minio
Same weakness: CWE-924

V. Comments for CVE-2021-21390

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