CVE-2021-39227 Fix prototype pollution in the zrender merge and clone helper methods
Prototype pollution in ZRender's merge and clone methods allows attackers to manipulate object prototypes, potentially leading to code execution or privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-39227?
CVE-2021-39227 is a medium-severity vulnerability in ecomfe zrender, published on 17 Sep 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-1321
Which versions are affected by CVE-2021-39227?
4 open source packages ship an affected version, including zrender. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
zrender npm | All versions | 4.3.3 |
zrender npm | All versions | 4.3.3 |
zrender npm | From 5.0.0 | 5.2.1 |
zrender npm | From 5.0.0 | 5.2.1 |
Products include Baidu Zrender.
How do I fix CVE-2021-39227?
Upgrade zrender to a fixed version for your release line: 4.3.3 or 5.2.1.
Is CVE-2021-39227 being exploited?
There is no known exploitation of CVE-2021-39227 in the wild and no public exploit code.
Sources
Also known as GHSA-fhv8-fx5f-7fxf.