CVE-2020-16873 Xamarin.Forms Spoofing Vulnerability
An attacker can execute arbitrary JavaScript on a target system via a spoofing vulnerability in Xamarin.Forms Android WebView.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2020-16873?
CVE-2020-16873 is a medium-severity cross-site scripting vulnerability in Microsoft xamarin.forms, published on 11 Sep 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
<p>A spoofing vulnerability manifests in Microsoft Xamarin.Forms due to the default settings on Android WebView version prior to 83.0.4103.106. This vulnerability could allow an attacker to execute arbitrary Javascript code on a target system.</p> <p>For the attack to be successful, the targeted user would need to browse to a malicious website or a website serving the malicious code through Xamarin.Forms.</p> <p>The security update addresses this vulnerability by preventing the malicious Javascript from running in the WebView.</p>
Weakness: CWE-1188
Which versions are affected by CVE-2020-16873?
It affects 1 product.
Products include Microsoft Xamarin.forms.
How do I fix CVE-2020-16873?
No fix has been published for CVE-2020-16873 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2020-16873 being exploited?
There is no known exploitation of CVE-2020-16873 in the wild and no public exploit code.
Sources
Also known as GHSA-mc93-wcph-m2mx.