Impact DDFFileParser and DefaultDDFFileValidator (and so ObjectLoader) are vulnerable to XXE AttacksProcessing).

DDF file is a LWM2M format used to store LWM2M object description. Leshan users are impacted only if they parse untrusted DDF files (e.g. if they let external users provide their own model), in that case they MUST upgrade to fixed version. If you parse only trusted DDF file and validate only with trusted xml schema, upgrading is not mandatory.

Patches This is fixed in v1.5.0 and 2.0.0-M13.

Workarounds No easy way. Eventually writing your own DDFFileParser/DefaultDDFFileValidator (and so ObjectLoader) creating a DocumentBuilderFactory with : java // For DDFFileParser DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); factory.setFeature(XMLConstants.FEATURESECUREPROCESSING, true); factory.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true); // Disable DTDs factory.setXIncludeAware(false); // Disable XML Inclusions factory.setExpandEntityReferences(false); // disable expand entity reference nodes

// For DefaultDDFFileValidator SchemaFactory factory = SchemaFactory.newInstance(XMLConstants.W3CXMLSCHEMANSURI); factory.setFeature(XMLConstants.FEATURESECUREPROCESSING, true); factory.setProperty(XMLConstants.ACCESSEXTERNALDTD, ""); factory.setProperty(XMLConstants.ACCESSEXTERNALSCHEMA, "");

References - https://owasp.org/www-community/vulnerabilities/XMLExternalEntity(XXE)Processing - https://cheatsheetseries.owasp.org/cheatsheets/XMLExternalEntityPreventionCheatSheet.html - https://semgrep.dev/docs/cheat-sheets/java-xxe/ - https://community.veracode.com/s/article/Java-Remediation-Guidance-for-XXE