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Android WebView Universal Cross-site Scripting

Moderate severity GitHub Reviewed Published Sep 18, 2020 in react-native-webview/react-native-webview • Updated Jan 27, 2023

Package

npm react-native-webview (npm)

Affected versions

<= 10.10.2

Patched versions

11.0.0

Description

A universal cross-site scripting (UXSS) vulnerability, CVE-2020-6506 (https://crbug.com/1083819), has been identified in the Android WebView system component, which allows cross-origin iframes to execute arbitrary JavaScript in the top-level document. This vulnerability affects React Native apps which use a react-native-webview that allows navigation to arbitrary URLs, and when that app runs on systems with an Android WebView version prior to 83.0.4103.106.

Pending mitigation

Ensure users update their Android WebView system component via the Google Play Store to 83.0.4103.106 or higher to avoid this UXSS. 'react-native-webview' is working on a mitigation but it could take some time.

References

https://alesandroortiz.com/articles/uxss-android-webview-cve-2020-6506/

References

Published by the National Vulnerability Database Jul 22, 2020
@jamonholmgren jamonholmgren published to react-native-webview/react-native-webview Sep 18, 2020
Reviewed Oct 2, 2020
Published to the GitHub Advisory Database Oct 2, 2020
Last updated Jan 27, 2023

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

EPSS score

0.286%
(69th percentile)

Weaknesses

CVE ID

CVE-2020-6506

GHSA ID

GHSA-36j3-xxf7-4pqg

Source code

Credits

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