GHSA-23x4-m842-fmwf

Suggest an improvement
Source
https://github.com/advisories/GHSA-23x4-m842-fmwf
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/05/GHSA-23x4-m842-fmwf/GHSA-23x4-m842-fmwf.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-23x4-m842-fmwf
Aliases
Published
2021-05-11T00:04:40Z
Modified
2024-02-16T08:09:13.529344Z
Severity
  • 9.3 (Critical) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H CVSS Calculator
Summary
Creation of Temporary File in Directory with Insecure Permissions in the OpenAPI-Generator online generator
Details

Impact

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.

openapi-generator-online creates insecure temporary folders with File.createTempFile during the code generation process. The insecure temporary folders store the auto-generated files which can be read and appended to by any users on the system.

Vulnerable Code

https://github.com/OpenAPITools/openapi-generator/blob/c6530519975341d7784a252132b2f0854f488901/modules/openapi-generator-online/src/main/java/org/openapitools/codegen/online/service/Generator.java#L184-L187

This vulnerability exists due to a race condition between the deletion of the randomly generated temporary file and the creation of the temporary directory.

File outputFolder = File.createTempFile("codegen-", "-tmp"); // Attacker knows the full path of the file that will be generated
// delete the file that was created
outputFolder.delete(); // Attacker sees file is deleted and begins a race to create their own directory before the code generator
// and make a directory of the same name
// SECURITY VULNERABILITY: Race Condition! - Attacker beats the code generator and now owns this directory
outputFolder.mkdir();

Patches

The issue has been patched by changing the underlying logic to use Files.createTempFile and has been released in the v5.1.0 stable version.

This vulnerability has the same root cause as CVE-2021-21363 from the swagger-api/swagger-codegen project as this project and that one both share the same original source tree. See: https://github.com/swagger-api/swagger-codegen/security/advisories/GHSA-pc22-3g76-gm6j

For more information

If you have any questions or comments about this advisory: * Open an issue in OpenAPI Generator Github repo * Email us at security@openapitools.org

References

Affected packages

Maven / org.openapitools:openapi-generator-online

Package

Name
org.openapitools:openapi-generator-online
View open source insights on deps.dev
Purl
pkg:maven/org.openapitools/openapi-generator-online

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.1.0

Affected versions

3.*

3.0.0
3.0.1
3.0.2
3.0.3
3.1.0
3.1.1
3.1.2
3.2.0
3.2.1
3.2.2
3.2.3
3.3.0
3.3.1
3.3.2
3.3.3
3.3.4

4.*

4.0.0-beta
4.0.0-beta2
4.0.0-beta3
4.0.0
4.0.1
4.0.2
4.0.3
4.1.0
4.1.1
4.1.2
4.1.3
4.2.0
4.2.1
4.2.2
4.2.3
4.3.0
4.3.1

5.*

5.0.0-beta
5.0.0-beta2
5.0.0-beta3
5.0.0
5.0.1