CVE-2021-21363

Generator Web Application: Local Privilege Escalation Vulnerability via System Temp Directory

Severity Score

7.0

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

swagger-codegen es un proyecto de código abierto que contiene un motor basado en plantillas para generar documentación, clientes API y stubs de servidor en diferentes idiomas mediante el análisis de su definición de OpenAPI/Swagger. En swagger-codegen versiones anteriores a 2.4.19, en sistemas similares a Unix, el directorio temporal del sistema se comparte entre todos los usuarios de ese sistema. Un usuario ubicado puede observar el proceso de creación de un subdirectorio temporal en el directorio temporal compartido y una corrida para completar la creación del subdirectorio temporal. Esta vulnerabilidad es una escalada de privilegios local porque un atacante puede agregar el contenido de "outputFolder". Como tal, el código escrito en este directorio, cuando se ejecuta, puede ser controlado por el atacante. Para mayor detalles, consulte el GitHub Security Advisory al que se hace referencia. Esta vulnerabilidad es corregido en versión 2.4.19

*Credits: N/A

CVSS Scores

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

Required

Scope

Changed

Confidentiality

None

Integrity

High

Availability

None

Attack Vector

Local

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-12-22 CVE Reserved
2021-03-11 CVE Published
2023-03-08 EPSS Updated
2024-08-03 CVE Updated
2024-08-03 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-378: Creation of Temporary File With Insecure Permissions
CWE-379: Creation of Temporary File in Directory with Insecure Permissions

CAPEC

References (2)

URL	Tag	Source

URL	Date	SRC
https://github.com/swagger-api/swagger-codegen/security/advisories/GHSA-pc22-3g76-gm6j	2024-08-03

URL	Date	SRC
https://github.com/swagger-api/swagger-codegen/commit/987ea7a30b463cc239580d6ad166c707ae942a89	2021-03-18

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Smartbear Search vendor "Smartbear"		Swagger-codegen Search vendor "Smartbear" for product "Swagger-codegen"				< 2.4.19 Search vendor "Smartbear" for product "Swagger-codegen" and version " < 2.4.19"		-		Affected