CVE-2019-19106
📋 TL;DR
CVE-2019-19106 is an access control vulnerability in ABB and Busch-Jaeger telephone gateway devices that allows unauthorized users to view and modify restricted data including user profiles and application settings. This affects organizations using ABB Telephone Gateway TG/S 3.2 or Busch-Jaeger 6186/11 Telefon-Gateway devices for building automation and telephony integration.
💻 Affected Systems
- ABB Telephone Gateway TG/S 3.2
- Busch-Jaeger 6186/11 Telefon-Gateway
📦 What is this software?
6186\/11 Firmware by Busch Jaeger
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain administrative control over telephone gateway functions, potentially intercepting calls, modifying user permissions, disrupting building automation systems, and accessing sensitive configuration data.
Likely Case
Unauthorized users access and modify user profiles, application settings, and potentially disrupt telephony services within affected building automation systems.
If Mitigated
With proper network segmentation and access controls, impact is limited to isolated network segments with no access to critical systems.
🎯 Exploit Status
The vulnerability allows unauthenticated access to restricted functions, making exploitation straightforward once network access is obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: TG/S 3.2 with security update
Vendor Advisory: https://search.abb.com/library/Download.aspx?DocumentID=9AKK107680A3921&LanguageCode=en&DocumentPartId=&Action=Launch
Restart Required: Yes
Instructions:
1. Download security update from ABB portal. 2. Backup current configuration. 3. Apply update following vendor instructions. 4. Restart device. 5. Verify functionality.
🔧 Temporary Workarounds
Network Segmentation
allIsolate telephone gateway devices on separate VLAN with strict firewall rules limiting access to authorized management systems only.
Access Control Lists
allImplement strict IP-based access controls allowing only authorized administrative systems to connect to gateway management interfaces.
🧯 If You Can't Patch
- Implement strict network segmentation to isolate affected devices from untrusted networks
- Deploy network monitoring and intrusion detection specifically for gateway management traffic
🔍 How to Verify
Check if Vulnerable:
Check device version via web interface or CLI; if running TG/S 3.2 without security updates, assume vulnerable.Check Version:
Check via web interface at http://[device-ip]/status or consult device documentation for CLI version check.Verify Fix Applied:
Verify updated version is installed and test that unauthorized users cannot access restricted management functions.📡 Detection & Monitoring
Log Indicators:
- Unauthorized access attempts to management interfaces
- Configuration changes from unexpected IP addresses
- Failed authentication attempts followed by successful restricted access
Network Indicators:
- Unexpected HTTP/HTTPS traffic to gateway management ports from unauthorized sources
- Traffic patterns indicating configuration changes
SIEM Query:
source_ip NOT IN (authorized_admin_ips) AND dest_port IN (80,443,8080) AND dest_ip IN (gateway_ips) AND (uri CONTAINS "/admin" OR uri CONTAINS "/config")