CVE-2023-0870
📋 TL;DR
This CVE describes a cross-site request forgery (CSRF) vulnerability in OpenNMS Meridian and Horizon monitoring platforms. Attackers can manipulate forms to perform unauthorized actions, potentially accessing confidential information or compromising system integrity. Organizations running vulnerable versions of these platforms are affected.
💻 Affected Systems
- OpenNMS Meridian
- OpenNMS Horizon
📦 What is this software?
Horizon by Opennms
Meridian by Opennms
Meridian by Opennms
Meridian by Opennms
Meridian by Opennms
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing unauthorized access to sensitive monitoring data, configuration changes, or administrative takeover of the OpenNMS platform.
Likely Case
Unauthorized data access or configuration changes within the OpenNMS platform, potentially affecting monitored systems and network visibility.
If Mitigated
Limited impact due to proper network segmentation and access controls, with only authorized users able to interact with the vulnerable interface.
🎯 Exploit Status
CSRF attacks require user interaction (victim must be logged in and visit malicious page).
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Meridian 2023.1.1 or Horizon 31.0.6
Vendor Advisory: https://docs.opennms.com/meridian/2023/releasenotes/changelog.html#releasenotes-changelog-Meridian-2023.1.1
Restart Required: Yes
Instructions:
1. Backup current configuration and data. 2. Download patched version from OpenNMS repository. 3. Stop OpenNMS service. 4. Install updated version following vendor documentation. 5. Restart OpenNMS service. 6. Verify functionality.
🔧 Temporary Workarounds
CSRF Protection Headers
allImplement CSRF tokens or SameSite cookie attributes in web application configuration
Configuration changes in web.xml or application.properties
Network Segmentation
allRestrict access to OpenNMS web interface to trusted internal networks only
firewall rules to block external access to OpenNMS ports
🧯 If You Can't Patch
- Implement strict network access controls to limit OpenNMS web interface access to authorized users only
- Deploy web application firewall (WAF) with CSRF protection rules and monitor for suspicious requests
🔍 How to Verify
Check if Vulnerable:
Check OpenNMS version via web interface admin panel or command lineCheck Version:
opennms versionVerify Fix Applied:
Verify version is Meridian 2023.1.1+ or Horizon 31.0.6+ and test form submissions for CSRF tokens📡 Detection & Monitoring
Log Indicators:
- Unusual form submissions from unexpected sources
- Multiple failed authentication attempts followed by successful form submissions
Network Indicators:
- HTTP requests to OpenNMS forms without proper referrer headers or CSRF tokens
- Traffic from external sources to internal OpenNMS ports
SIEM Query:
source="opennms" AND (http_method="POST" OR http_method="PUT") AND NOT referrer="*opennms*"🔗 References
- https://docs.opennms.com/meridian/2023/releasenotes/changelog.html#releasenotes-changelog-Meridian-2023.1.1
- https://github.com/OpenNMS/opennms/pull/5835/files
- https://docs.opennms.com/meridian/2023/releasenotes/changelog.html#releasenotes-changelog-Meridian-2023.1.1
- https://github.com/OpenNMS/opennms/pull/5835/files
