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CVE-2021-21428— Creation of Temporary File in Directory with Insecure Permissions in the OpenAPI-Generator online generator

Quick assessment

Affected
OpenAPITools openapi-generator
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.

openapi-generator是一个应用软件。提供一个开放的API接口。 Openapi generator 存在安全漏洞。该漏洞源于程序在创建不安全的临时目录时，系统上的任何用户都可以读取并附加这些文件。

CVSS 9.3 · Critical EPSS 0.35% · P28

Possible ATT&CK Techniques 1 AI

T1222.002 · Linux and Mac Permissions
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I. Basic Information for CVE-2021-21428

Vulnerability Information
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Vulnerability Title
Creation of Temporary File in Directory with Insecure Permissions in the OpenAPI-Generator online generator
Source: CVE Program / CVE List V5
Vulnerability Description
Openapi generator is a java tool which allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec. openapi-generator-online creates insecure temporary folders with File.createTempFile during the code generation process. The insecure temporary folders store the auto-generated files which can be read and appended to by any users on the system. The issue has been patched with `Files.createTempFile` and released in the v5.1.0 stable version.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
特权管理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Openapi generator 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
openapi-generator是一个应用软件。提供一个开放的API接口。 Openapi generator 存在安全漏洞。该漏洞源于程序在创建不安全的临时目录时，系统上的任何用户都可以读取并附加这些文件。
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
OpenAPITools openapi-generator < 5.1.0 -

II. Public POCs for CVE-2021-21428

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2021-21428

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Patches & Fixes for CVE-2021-21428 (1)

Vendor Advisories for CVE-2021-21428 (1)

IV. Related Vulnerabilities

Same product: openapi-generator
Same vendor: OpenAPITools
Same weakness: CWE-269

V. Comments for CVE-2021-21428

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