Improper Restriction of XML External Entity Reference in com.h2database:h2.
Date: 2021-12
Affected: maven/com.h2database:h2
Attack vector: other
Category: vulnerability-disclosure
Severity: High
CVE: CVE-2021-23463
CWE: CWE-611
CVSS: 8.1 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H)

H2 is an embeddable RDBMS written in Java. The package com.h2database:h2 from 1.4.198 and before 2.0.202 are vulnerable to XML External Entity (XXE) Injection via the org.h2.jdbc.JdbcSQLXML class object, when it receives parsed string data from org.h2.jdbc.JdbcResultSet.getSQLXML() method. If it executes the getSource() method when the parameter is DOMSource.class it will trigger the vulnerability.


Mitigations:

Architectural layers (MAESTRO):