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CVE-2021-21430 : What You Need to Know

Learn about CVE-2021-21430, a vulnerability in OpenAPI Generator allowing the creation of insecure temporary files in Java and Scala code. Find out the impacts, affected versions, and mitigation steps.

OpenAPI Generator allows generation of API client libraries, server stubs, and more. The use of

File.createTempFile
in Java Development Kit (JDK) can create insecure temporary files, leaving data vulnerable to attacks. This affects versions earlier than 5.1.0 and has been patched in v5.1.0.

Understanding CVE-2021-21430

This CVE relates to the creation of temporary files with insecure permissions when using auto-generated Java and Scala code in OpenAPI Generator.

What is CVE-2021-21430?

CVE-2021-21430 pertains to a vulnerability in OpenAPI Generator that allows the creation of insecure temporary files, potentially exposing system and application data to security risks.

The Impact of CVE-2021-21430

The vulnerability can lead to high confidentiality impact as insecure temporary files can be exploited to compromise sensitive information within affected systems.

Technical Details of CVE-2021-21430

This section outlines specific technical information about the vulnerability.

Vulnerability Description

The issue arises from the use of

File.createTempFile
in auto-generated Java and Scala code, resulting in the creation of insecure temporary files during data transfer processes.

Affected Systems and Versions

Versions prior to 5.1.0 of OpenAPI Generator are affected, particularly the

java
(jersey2, okhttp-gson) and
scala-finch
generators.

Exploitation Mechanism

Attackers can exploit the insecure temporary files created during API data transfers to gain unauthorized access to sensitive application and system data.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-21430, follow these guidelines.

Immediate Steps to Take

Update OpenAPI Generator to version 5.1.0 or newer to address this vulnerability and ensure the safe generation of API client libraries and server stubs.

Long-Term Security Practices

Implement secure coding practices and regularly update and patch software dependencies to prevent similar vulnerabilities from arising.

Patching and Updates

Stay informed about security advisories and apply patches promptly to protect your systems from potential exploits.

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