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CVE-2021-39227— Fix prototype pollution in the zrender merge and clone helper methods

Quick assessment

Affected
ecomfe zrender
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ZRender是开源的一个轻量级的图形库，为Apache图表提供2d绘图。 ZRender 存在安全漏洞，该漏洞源于网络系统或产品的代码开发过程中存在设计或实现不当的问题。

CVSS 6.2 · Medium EPSS 1.39% · P71

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-39227

Vulnerability Information
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Vulnerability Title
Fix prototype pollution in the zrender merge and clone helper methods
Source: CVE Program / CVE List V5
Vulnerability Description
ZRender is a lightweight graphic library providing 2d draw for Apache ECharts. In versions prior to 5.2.1, using `merge` and `clone` helper methods in the `src/core/util.ts` module results in prototype pollution. It affects the popular data visualization library Apache ECharts, which uses and exports these two methods directly. The GitHub Security Advisory page for this vulnerability contains a proof of concept. This issue is patched in ZRender version 5.2.1. One workaround is available: Check if there is `__proto__` in the object keys. Omit it before using it as an parameter in these affected methods. Or in `echarts.util.merge` and `setOption` if project is using ECharts.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
Source: CVE Program / CVE List V5
Vulnerability Title
ZRender 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ZRender是开源的一个轻量级的图形库，为Apache图表提供2d绘图。 ZRender 存在安全漏洞，该漏洞源于网络系统或产品的代码开发过程中存在设计或实现不当的问题。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ecomfe zrender < 5.2.1 -

II. Public POCs for CVE-2021-39227

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III. Intelligence Information for CVE-2021-39227

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Patches & Fixes for CVE-2021-39227 (1)

Vendor Advisories for CVE-2021-39227 (1)

Other References for CVE-2021-39227 (1)

IV. Related Vulnerabilities

Same weakness: CWE-1321

V. Comments for CVE-2021-39227

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