CVE-2019-6837
📋 TL;DR
This Server-Side Request Forgery (SSRF) vulnerability in Schneider Electric U.motion KNX servers allows attackers to modify URLs to access server configuration data. Affected systems include U.motion KNX Server, KNX Server Plus, and Touch devices. Attackers could potentially access sensitive configuration information.
💻 Affected Systems
- MEG6501-0001 - U.motion KNX server
- MEG6501-0002 - U.motion KNX Server Plus
- MEG6260-0410 - U.motion KNX Server Plus, Touch 10
- MEG6260-0415 - U.motion KNX Server Plus, Touch 15
📦 What is this software?
Meg6260 0410 Firmware by Schneider Electric
Meg6260 0415 Firmware by Schneider Electric
Meg6501 0001 Firmware by Schneider Electric
Meg6501 0002 Firmware by Schneider Electric
⚠️ Risk & Real-World Impact
Worst Case
Attackers could access sensitive server configuration data, potentially leading to further system compromise or exposure of network information.
Likely Case
Unauthorized access to server configuration data, potentially revealing network topology or sensitive system information.
If Mitigated
Limited to no impact if proper network segmentation and access controls prevent SSRF exploitation.
🎯 Exploit Status
SSRF vulnerabilities typically require minimal technical skill to exploit once discovered.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patched versions available through Schneider Electric
Vendor Advisory: https://www.schneider-electric.com/ww/en/download/document/SEVD-2019-253-01
Restart Required: Yes
Instructions:
1. Download the patch from Schneider Electric's security advisory. 2. Apply the patch according to vendor instructions. 3. Restart the affected U.motion servers.
🔧 Temporary Workarounds
Network Segmentation
allIsolate U.motion servers from untrusted networks and limit outbound connections
Access Control
allRestrict network access to U.motion servers to authorized users only
🧯 If You Can't Patch
- Implement strict network segmentation to isolate U.motion servers
- Monitor for unusual outbound connections from U.motion servers
🔍 How to Verify
Check if Vulnerable:
Check if your U.motion server version is listed in the affected products and hasn't been patchedCheck Version:
Check version through U.motion server web interface or management consoleVerify Fix Applied:
Verify that the patch has been applied by checking the system version against the patched version in the vendor advisory📡 Detection & Monitoring
Log Indicators:
- Unusual URL modification attempts
- Unexpected outbound connections from U.motion servers
Network Indicators:
- Unusual HTTP requests from U.motion servers to internal or external resources
SIEM Query:
source="U.motion" AND (url_contains="modify" OR outbound_connection="unusual")