CVE-2021-39227 : Vulnerability Insights and Analysis

ZRender, a lightweight graphic library for Apache ECharts, prior to version 5.2.1, is susceptible to prototype pollution. This vulnerability affects Apache ECharts as it uses the

merge

and

clone

methods. The issue is patched in version 5.2.1.

Understanding CVE-2021-39227

ZRender's vulnerability in the

merge

and

clone

helper methods can lead to prototype pollution, impacting data visualization in Apache ECharts.

What is CVE-2021-39227?

CVE-2021-39227 highlights a vulnerability in ZRender's

merge

and

clone

methods, affecting Apache ECharts by allowing for prototype pollution. Patched in version 5.2.1.

The Impact of CVE-2021-39227

This vulnerability could result in high availability impact with a CVSS base score of 6.2 (Medium severity). No implications for confidentiality, integrity, or user interaction. Discovery method is unknown.

Technical Details of CVE-2021-39227

This section delves into the technical aspects of the vulnerability.

Vulnerability Description

The issue arises from using the

merge

and

clone

methods in

src/core/util.ts

, leading to prototype pollution in ZRender.

Affected Systems and Versions

Product: zrender
Vendor: ecomfe
Versions Affected: < 5.2.1

Exploitation Mechanism

To exploit this vulnerability, an attacker may pollute the prototype via the

merge

and

clone

methods, impacting the data visualization library.

Mitigation and Prevention

Dealing with CVE-2021-39227 requires immediate actions and ongoing security practices.

Immediate Steps to Take

Ensure the ZRender version is updated to 5.2.1 to patch the vulnerability.
Check for

__proto__

in object keys and omit it before using as a parameter in the affected methods.

Long-Term Security Practices

Regularly monitor for security advisories and updates from ZRender.
Conduct security code reviews to catch similar vulnerabilities early.

Patching and Updates

Update to ZRender version 5.2.1 to mitigate the prototype pollution vulnerability.