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

2021-03-1103:05:23

CWE-379

CWE-378

GitHub_M

www.cve.org

generator web application

local privilege escalation

vulnerability

system temp directory

open-source

unix

temporary subdirectory

security advisory

fixed

cve-2021-21364

CVSS3

5.3

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:N/I:H/A:N

AI Score

6.6

Confidence

High

EPSS

Percentile

15.6%

JSON

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.

CNA Affected

[
  {
    "product": "swagger-codegen",
    "vendor": "swagger-api",
    "versions": [
      {
        "status": "affected",
        "version": "< 2.4.19"
      }
    ]
  }
]