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CVE-2021-21363— Generator Web Application: Local Privilege Escalation Vulnerability via System Temp Directory

Quick assessment

Affected
swagger-api swagger-codegen
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

HugoMario swagger-codegen是 （HugoMario） 的一个应用软件。用于在给定OpenAPI Spec的情况下自动生成API客户端库（生成SDK），服务器存根和文档。 swagger-codegen 存在安全漏洞，攻击者可利用该漏洞将outputFolder的内容附加到其后。写入该目录的代码在执行时受到攻击者的控制。

CVSS 5.3 · Medium EPSS 0.41% · P35

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2021-21363

Vulnerability Information
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Vulnerability Title
Generator Web Application: Local Privilege Escalation Vulnerability via System Temp Directory
Source: CVE Program / CVE List V5
Vulnerability Description
swagger-codegen is an open-source project which contains a template-driven engine to generate documentation, API clients and server stubs in different languages by parsing your OpenAPI / Swagger definition. In swagger-codegen before version 2.4.19, on Unix like systems, the system's temporary directory is shared between all users on that system. A collocated user can observe the process of creating a temporary sub directory in the shared temporary directory and race to complete the creation of the temporary subdirectory. This vulnerability is local privilege escalation because the contents of the `outputFolder` can be appended to by an attacker. As such, code written to this directory, when executed can be attacker controlled. For more details refer to the referenced GitHub Security Advisory. This vulnerability is fixed in version 2.4.19. Note this is a distinct vulnerability from CVE-2021-21364.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在具有不安全权限的目录中创建临时文件
Source: CVE Program / CVE List V5
Vulnerability Title
HugoMario swagger-codegen 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
HugoMario swagger-codegen是 （HugoMario） 的一个应用软件。用于在给定OpenAPI Spec的情况下自动生成API客户端库（生成SDK），服务器存根和文档。 swagger-codegen 存在安全漏洞，攻击者可利用该漏洞将outputFolder的内容附加到其后。写入该目录的代码在执行时受到攻击者的控制。
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
swagger-api swagger-codegen < 2.4.19 -

II. Public POCs for CVE-2021-21363

# POC Description Source Link Shenlong Link
1 None https://github.com/andikahilmy/CVE-2021-21363-swagger-codegen-vulnerable POC Details
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III. Intelligence Information for CVE-2021-21363

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Patches & Fixes for CVE-2021-21363 (1)

Vendor Advisories for CVE-2021-21363 (1)

IV. Related Vulnerabilities

Same product: swagger-codegen
Same vendor: swagger-api
Same weakness: CWE-379

V. Comments for CVE-2021-21363

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