CVE-2021-21364 Generated Code Contains Local Information Disclosure Vulnerability
Local attackers can read generated code files due to insecure default permissions in swagger-codegen, exposing sensitive information.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2021-21364?
CVE-2021-21364 is a medium-severity vulnerability in swagger-api swagger-codegen, published on 11 Mar 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official 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.
Which versions are affected by CVE-2021-21364?
2 open source packages ship an affected version, including io.swagger:swagger-codegen. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
io.swagger:swagger-codegen Maven | All versions | 2.4.19 |
io.swagger:swagger-codegen Maven | All versions | 2.4.19 |
Products include Smartbear Swagger-Codegen.
How do I fix CVE-2021-21364?
Upgrade io.swagger:swagger-codegen to 2.4.19 or later.
Is CVE-2021-21364 being exploited?
There is no known exploitation of CVE-2021-21364 in the wild and no public exploit code.
Other vulnerabilities in swagger-api swagger-codegen
Sources
Also known as GHSA-hpv8-9rq5-hq7w.