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

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是美国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 RELEASE.2021-03-04T00-53-13Z 版本之前存在授权问题漏洞，该漏洞允许通过创建临时的 “mc share upload” URL绕过只读策略。

CVSS 7.7 · High EPSS 1.32% · P70

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts
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I. Basic Information for CVE-2021-21362

Vulnerability Information
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Vulnerability Title
Bypassing readOnly policy by creating a temporary 'mc share upload' URL
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.2021-03-04T00-53-13Z 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
MinIO 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MinIO是美国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 RELEASE.2021-03-04T00-53-13Z 版本之前存在授权问题漏洞，该漏洞允许通过创建临时的 “mc share upload” URL绕过只读策略。
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.2021-03-04T00-53-13Z -

II. Public POCs for CVE-2021-21362

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III. Intelligence Information for CVE-2021-21362

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Patches & Fixes for CVE-2021-21362 (2)

Vendor Advisories for CVE-2021-21362 (1)

Other References for CVE-2021-21362 (1)

IV. Related Vulnerabilities

Same product: minio
Same vendor: minio
Same weakness: CWE-285

V. Comments for CVE-2021-21362

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