CVE-2021-21364

MEDIUM LAB

Smartbear Swagger-codegen < 2.4.19 - Information Disclosure

Title source: rule

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 temporary directory is shared between all local users. When files/directories are created, the default `umask` settings for the process are respected. As a result, by default, most processes/apis will create files/directories with the permissions `-rw-r--r--` and `drwxr-xr-x` respectively, unless an API that explicitly sets safe file permissions is used. Because this vulnerability impacts generated code, the generated code will remain vulnerable until fixed manually! This vulnerability is fixed in version 2.4.19. Note this is a distinct vulnerability from CVE-2021-21363.

Exploits (2)

nomisec WORKING POC
by dawetmaster · poc
https://github.com/dawetmaster/CVE-2021-21364-swagger-codegen-vulnerable
nomisec WORKING POC
by andikahilmy · poc
https://github.com/andikahilmy/CVE-2021-21364-swagger-codegen-vulnerable

Scores

CVSS v3 5.3
EPSS 0.0007
EPSS Percentile 20.6%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:H/I:N/A:N

Lab Environment

COMMUNITY
Community Lab
docker pull mcr.microsoft.com/dotnet/core/sdk:3.0
docker pull mcr.microsoft.com/dotnet/core/aspnet:3.0
docker pull mcr.microsoft.com/dotnet/core/sdk:2.2
docker pull mcr.microsoft.com/dotnet/core/aspnet:2.2
docker pull frolvlad/alpine-oraclejdk8:slim

Details

CWE
CWE-378 CWE-200 CWE-732
Status published
Products (2)
io.swagger/swagger-codegen 0 - 2.4.19Maven
smartbear/swagger-codegen < 2.4.19
Published Mar 11, 2021
Tracked Since Feb 18, 2026