title: An XML External Entity injection vulnerability
description: XXE injection in /rtc/post/ endpoint in OpenMNS Horizon 31.0.8 and versions earlier than 32.0.2 on multiple platforms is vulnerable to XML external entity (XXE) injection, which can be used for instance to force Horizon to make arbitrary HTTP requests to internal and external services. The solution is to upgrade to Meridian 2023.1.6, 2022.1.19, 2021.1.30, 2020.1.38 or Horizon 32.0.2 or newer. Meridian and Horizon installation instructions state that they are intended for installation within an organization's private networks and should not be directly accessible from the Internet. OpenNMS thanks Erik Wynter and Moshe Apelbaum for reporting this issue.
problem types: CWE-611 Improper Restriction of XML External Entity Reference
affected:
{
defaultStatus: unaffected
platforms: [Windows, Linux, MacOS]
product: Horizon
repo: https://github.com/OpenNMS/opennms
vendor: The OpenNMS Group
versions:
lessThan: 32.0.2, status: affected, version: 31.0.8, versionType: maven
lessThan: 31.0.8, status: unknown, version: 0, versionType: maven
}
{
defaultStatus: unaffected
platforms: [Windows, MacOS, Linux]
product: Meridian
repo: https://github.com/OpenNMS/opennms
vendor: The OpenNMS Group
versions:
lessThan: 2023.1.6, status: affected, version: 2023.0.0, versionType: maven
lessThan: 2022.1.19, status: affected, version: 2022.0.0, versionType: maven
lessThan: 2021.1.30, status: affected, version: 2021.0.0, versionType: maven
lessThan: 2020.1.38, status: affected, version: 2020.0.0, versionType: maven
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: ADJACENT_NETWORK
availabilityImpact: LOW
baseScore: 5.4
baseSeverity: MEDIUM
confidentialityImpact: LOW
integrityImpact: NONE
privilegesRequired: LOW
scope: CHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:L
version: 3.1
]
format: CVSS
scenarios: GENERAL. Score based on the assumption that Horizon and Meridian are installed on internally protected networks and not exposed to the Internet, per installation instructions.
solutions: Upgrade to Meridian 2023.1.6, 2022.1.19, 2021.1.30, 2020.1.38 or Horizon 32.0.2 or newer.