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https://issues.apache.org/jira/browse/WW-5409?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kusal Kithul-Godage resolved WW-5409.
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Resolution: Fixed
> Introduce final attribute to package elements which makes them unextendable
> ---------------------------------------------------------------------------
>
> Key: WW-5409
> URL: https://issues.apache.org/jira/browse/WW-5409
> Project: Struts 2
> Issue Type: Improvement
> Components: Core
> Reporter: Kusal Kithul-Godage
> Priority: Minor
> Fix For: 6.5.0
>
> Time Spent: 1h 10m
> Remaining Estimate: 0h
>
> Extending packages is a very useful capability of Struts but there are some
> quirks, that if a developer is not aware of, can lead to critical
> vulnerabilities.
> One such misunderstood quirk is the {{default-interceptor-ref}} element.
> Take the following package:
> {code:xml}
> <package name="package1">
> <default-interceptor-ref name="adminOnly"/>
> <action name="action1" class="Action1">
> <result name="success" />
> </action>
> </package>{code}
> If it is extended by another package like so:
> {code:xml}
> <package name="package2" extends="package1">
> <default-interceptor-ref name="authenticatedOnly"/>
> <action name="action2" class="Action2">
> <result name="success" />
> </action>
> </package> {code}
> The second package will inherit Action1, however it will behave very
> differently in Package2, because it is no longer subject to the same
> interceptors. The {{default-interceptor-ref}} value from the first package
> does not apply to any action in the extending package, not even the ones
> defined in the inherited one.
> This is not immediately obvious to many developers, especially those not very
> familiar with Struts. They could simply have extended the package to obtain
> access to other elements such as results or result-types.
> One potential mitigation against this developer error is to mark potentially
> sensitive packages as 'final' to prevent certain Actions from being inherited
> by other packages.
> This would look like the following:
> {code:xml}
> <package name="package1" final="true">
> <default-interceptor-ref name="adminOnly"/>
> <action name="action1" class="Action1">
> <result name="success" />
> </action>
> </package>{code}
>
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