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https://issues.apache.org/jira/browse/WW-5621?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on WW-5621 started by Lukasz Lenart.
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> Harden XML parsers against Entity Expansion (Billion Laughs) attacks
> --------------------------------------------------------------------
>
> Key: WW-5621
> URL: https://issues.apache.org/jira/browse/WW-5621
> Project: Struts 2
> Issue Type: Improvement
> Components: Plugin - XSLT
> Reporter: Lukasz Lenart
> Assignee: Lukasz Lenart
> Priority: Minor
> Fix For: 6.9.0, 7.2.0
>
>
> Defense-in-depth hardening of XML parsers. Modern JDKs (7u45+) already
> enforce a 64K entity expansion limit, so this is not an exploitable
> vulnerability — all XML sources come from the classpath, not user input.
> Changes:
> - Remove unused {{parseStringAsXML}} feature from {{StringAdapter}} to
> eliminate theoretical attack surface
> - Deprecate {{getParseStringAsXML()}} / {{setParseStringAsXML()}} for
> future removal
> - Enable {{FEATURE_SECURE_PROCESSING}} in Tiles
> {{DigesterDefinitionsReader}}
> - Add unit test verifying JDK entity expansion limit rejects Billion Laughs
> payloads
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