JVN#62161191: JavaFX WebEngine does not properly restrict Java method execution

JavaFX, GUI library for Java applications, is provided with OracleJDK 7 through 10.
Since OracleJDK 11, JavaFX is separately maintained and developed by OpenJFX project under OpenJDK community.

JavaFX WebEngine component is capable of web content rendering, and possible to be configured to allow JavaScript code to execute Java methods.
WebEngine component does not properly restrict Java methods execution(CWE-470).
This vulnerability is similar to CVE-2012-6636 of Android WebView component.

Impact

When a JavaFX application renders crafted web contents, an arbitrary Java code may be executed with the application’s privilege.

Solution

Update the software
JavaFX application developers should update their applications with the latest version of JavaFX library.
JavaFX application users should update their Java execution environment to the latest version.

JavaFX library in OracleJDK 8u251 and JavaFX 14.0.1 restrict a number of Java methods callable from JavaScript code.
Please refer to release notes for details.

Products Affected

• OracleJDK 8 versions prior to update 251
• JavaFX versions prior to 14.0.1