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CVE-2021-33813: fix setFeature bug and add test case by esti-burstein · Pull Request #188 · hunterhacker/jdom
An XXE issue in SAXBuilder in JDOM through 2.0.6 allows attackers to cause a denial of service via a crafted HTTP request.
This PR changes the order of precedence between setExpandEntities and user-supplied features. It’s a relatively small risk, but this PR will change existing code behaviour in the case where existing code has set the “http://xml.org/sax/features/external-general-entities” feature to a value that conflicts with setExpendEntities.
Previously, setExpendEntities overruled user-supplied features, and now the opposite is true.
Note, JDOM tries to “isolate” users from needing to know the internal guts of what underlying parsers are used, so the setExpendEntities() makes it simpler to manage the feature than knowing exactly which parser is being used, and whether it supports the feature change.
Further, the way I read this, I think it’s possible now to set conflicting features with “http://xml.org/sax/handlers/DeclHandler”
This may need to be tweaked.
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