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

5.3 Medium

CVSS3

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

6.6 Medium

AI Score

Confidence

High

0.0004 Low

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"
      }
    ]
  }
]