GHSA-WC9J-GC65-3CM7

Vulnerability from github – Published: 2023-08-31 21:47 – Updated: 2023-08-31 21:47
VLAI
Summary
DDFFileParser is vulnerable to XXE Attacks
Details

Impact

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

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 : 

// For DDFFileParser
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, 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.W3C_XML_SCHEMA_NS_URI);
factory.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, true);
factory.setProperty(XMLConstants.ACCESS_EXTERNAL_DTD, "");
factory.setProperty(XMLConstants.ACCESS_EXTERNAL_SCHEMA, "");

References

  • https://owasp.org/www-community/vulnerabilities/XML_External_Entity_(XXE)_Processing
  • https://cheatsheetseries.owasp.org/cheatsheets/XML_External_Entity_Prevention_Cheat_Sheet.html
  • https://semgrep.dev/docs/cheat-sheets/java-xxe/
  • https://community.veracode.com/s/article/Java-Remediation-Guidance-for-XXE
Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
Show details on source website
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.eclipse.leshan:leshan-core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.5.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.eclipse.leshan:leshan-core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.0.0-M1"
            },
            {
              "fixed": "2.0.0-M13"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2023-41034"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-611"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2023-08-31T21:47:28Z",
    "nvd_published_at": "2023-08-31T18:15:09Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\n`DDFFileParser` and `DefaultDDFFileValidator` (and so `ObjectLoader`) are vulnerable to [XXE Attacks](https://owasp.org/www-community/vulnerabilities/XML_External_Entity_(XXE)_Processing).\n\n[DDF file](https://github.com/eclipse-leshan/leshan/wiki/Adding-new-objects#the-lwm2m-model) is a LWM2M format used to store LWM2M object description.   \nLeshan 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.\nIf you parse only trusted DDF file and validate only with trusted xml schema, upgrading is not mandatory. \n\n### Patches\nThis is fixed in **v1.5.0** and **2.0.0-M13**.\n\n### Workarounds\nNo easy way. Eventually writing your own `DDFFileParser`/`DefaultDDFFileValidator` (and so `ObjectLoader`) creating a `DocumentBuilderFactory` with : \n```java\n// For DDFFileParser\nDocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();\nfactory.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, true);\nfactory.setFeature(\"http://apache.org/xml/features/disallow-doctype-decl\", true); // Disable DTDs\nfactory.setXIncludeAware(false); // Disable XML Inclusions\nfactory.setExpandEntityReferences(false); // disable expand entity reference nodes\n\n// For DefaultDDFFileValidator\nSchemaFactory factory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);\nfactory.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, true);\nfactory.setProperty(XMLConstants.ACCESS_EXTERNAL_DTD, \"\");\nfactory.setProperty(XMLConstants.ACCESS_EXTERNAL_SCHEMA, \"\");\n``` \n\n### References\n- https://owasp.org/www-community/vulnerabilities/XML_External_Entity_(XXE)_Processing\n- https://cheatsheetseries.owasp.org/cheatsheets/XML_External_Entity_Prevention_Cheat_Sheet.html\n- https://semgrep.dev/docs/cheat-sheets/java-xxe/\n- https://community.veracode.com/s/article/Java-Remediation-Guidance-for-XXE",
  "id": "GHSA-wc9j-gc65-3cm7",
  "modified": "2023-08-31T21:47:28Z",
  "published": "2023-08-31T21:47:28Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/eclipse-leshan/leshan/security/advisories/GHSA-wc9j-gc65-3cm7"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-41034"
    },
    {
      "type": "WEB",
      "url": "https://github.com/eclipse-leshan/leshan/commit/29577d2879ba8e7674c3b216a7f01193fc7ae013"
    },
    {
      "type": "WEB",
      "url": "https://github.com/eclipse-leshan/leshan/commit/4d3e63ac271a817f81fba3e3229c519af7a3049c"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/eclipse-leshan/leshan"
    },
    {
      "type": "WEB",
      "url": "https://github.com/eclipse-leshan/leshan/wiki/Adding-new-objects#the-lwm2m-model"
    },
    {
      "type": "WEB",
      "url": "https://owasp.org/www-community/vulnerabilities/XML_External_Entity_(XXE)_Processing"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "DDFFileParser is vulnerable to XXE Attacks"
}


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