Bug 1938308 (CVE-2021-21364) - CVE-2021-21364 swagger-codegen: incorrect default permissions of temporary files
Summary: CVE-2021-21364 swagger-codegen: incorrect default permissions of temporary files
Keywords:
Status: NEW
Alias: CVE-2021-21364
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Nobody
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Blocks: 1938309
TreeView+ depends on / blocked
 
Reported: 2021-03-12 18:26 UTC by Guilherme de Almeida Suckevicz
Modified: 2023-07-07 08:29 UTC (History)
2 users (show)

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A flaw was found in swagger-codegen. 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.
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Description Guilherme de Almeida Suckevicz 2021-03-12 18:26:37 UTC 
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.

Reference:
https://github.com/swagger-api/swagger-codegen/security/advisories/GHSA-hpv8-9rq5-hq7w

Upstream patch:
https://github.com/swagger-api/swagger-codegen/commit/35adbd552d5f99b3ff1e0e59da228becc85190f2
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