<!-- This ticket is confidential. --> <!-- ############################# Do not remove the lines above ############################# --> # CVE Reservation Request <!-- There's help in the Eclipse Foundation Project Handbook https://www.eclipse.org/projects/handbook/#vulnerability-cve Note that this issue is configured (see the quick actions at the bottom) to be created as confidential. Note that a vulnerability does not need to actually be resolved before it is reported and that these reports can be revised as needed (reopen the issue to request changes). If you do not know how to fill certain fields, mark that in the comment and we will help you. You can delete the comments (or not). --> The Eclipse Foundation is a [Common Vulnerabilities and Exposures](https://cve.mitre.org/) (CVE) Numbering Authority. Creating this ticket initiates **reservation** of a CVE ID for the documented vulnerability. The reserved CVE ID will be posted in a comment below, and kept **confidential** until explicit publication request. > [!note] > To request CVE *publication*, please open a [CVE publication](https://gitlab.eclipse.org/security/cve-assignment/-/issues/new?issuable_template=CVE%20Publication%20Request&issue[confidential]=true) ticket. Please fill in the fields below to draft the CVE record. --- <!-- Required. Specify the project's name (e.g., "Eclipse Dash") and Eclipse Foundation ID, e.g., "technology.dash". --> **Project name:** Eclipse AAS Model for Java (Eclipse AAS4J) **Project id:** dt.aas4j <!-- Required. Specify the affected versions. --> **Versions affected:** `< 3.0.1` (all released versions from `1.0.0-milestone-01` up to and including `3.0.0`) Affected Maven artifacts: - `org.eclipse.digitaltwin.aas4j:aas4j-dataformat-xml` - `org.eclipse.digitaltwin.aas4j:aas4j-dataformat-aasx` (reaches the vulnerable code through `AASXValidator`) **Fixed in:** `3.0.1` <!-- Optional. Common Weakness Enumeration (CWE) identifier. --> **Common Weakness Enumeration:** - CWE-611: Improper Restriction of XML External Entity Reference <!-- Optional. Common Vulnerability Scoring System (CVSS) vector and score. --> **Common Vulnerability Scoring System:** - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N — **8.6 (High)** <!-- Scope is set to Changed (S:C) because the XXE can be used for SSRF: it makes the validating process send arbitrary outbound HTTP/FTP requests (for example to cloud metadata endpoints such as 169.254.169.254, or to internal services). The impact therefore reaches components outside the library's security scope. Scored as the reasonable worst case for a library: an application that validates uploaded AAS XML / AASX files. --> <!-- Required. A one-sentence summary of the vulnerability, suitable for the CVE record description. --> **Summary:** In Eclipse AAS4J before 3.0.1, `XmlSchemaValidator.validateSchema()` (and `AASXValidator.validateSchema()`, which calls it) validates untrusted XML with a default JAXP `Validator` that resolves external DTDs and external entities. An attacker who supplies a crafted AAS XML document or AASX package can read local files from the host, send their contents out-of-band to an attacker-controlled server, and make the validating process send arbitrary outbound requests (SSRF). Validation still returns no errors. <!-- Optional. Additional technical details. --> **Details:** - Vulnerable code: `dataformat-xml/src/main/java/org/eclipse/digitaltwin/aas4j/v3/dataformat/xml/XmlSchemaValidator.java`. `schema.newValidator().validate(new StreamSource(...))` runs without `ACCESS_EXTERNAL_DTD` / `ACCESS_EXTERNAL_SCHEMA` restrictions and without `disallow-doctype-decl`. - Second entry point: `dataformat-aasx/src/main/java/org/eclipse/digitaltwin/aas4j/v3/dataformat/aasx/AASXValidator.java`. The AAS XML part of an `.aasx` package is passed unchanged to the vulnerable validator. - `XmlDeserializer` (Jackson/Woodstox) is **not** affected, because DTD support is disabled by default there. - Present since the initial import of the code base (commit `cc9da52`). - Fix: harden the validator by setting `ACCESS_EXTERNAL_DTD` and `ACCESS_EXTERNAL_SCHEMA` to `""` and rejecting `DOCTYPE` declarations. The bundled `AAS.xsd` does not need DTDs, so no functionality is lost. <!-- Required. Links to the project's repository, issue, fix commit, advisory etc. --> **Links:** - https://github.com/eclipse-aas4j/aas4j - https://github.com/eclipse-aas4j/aas4j/blob/main/dataformat-xml/src/main/java/org/eclipse/digitaltwin/aas4j/v3/dataformat/xml/XmlSchemaValidator.java - Fix commit / GitHub Security Advisory: _to be added on publication (fix is currently internal)_