CVE-2019-19876
📋 TL;DR
CVE-2019-19876 is a SQL injection vulnerability in B&R Industrial Automation APROL's EnMon PHP script. This allows attackers to execute arbitrary SQL commands on the database, potentially compromising the entire APROL system. Organizations using APROL versions before R4.2 V7.08 are affected.
💻 Affected Systems
- B&R Industrial Automation APROL
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise including remote code execution, data theft, manipulation of industrial processes, and potential physical damage to industrial equipment.
Likely Case
Database compromise leading to data theft, manipulation of industrial control data, and potential disruption of industrial operations.
If Mitigated
Limited impact with proper network segmentation and access controls, potentially only affecting the database layer.
🎯 Exploit Status
SQL injection vulnerabilities typically have low exploitation complexity. The CVSS 9.8 score indicates critical severity with network access and no authentication required.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: R4.2 V7.08 and later
Vendor Advisory: https://www.br-automation.com/downloads_br_productcatalogue/BRP44400000000000000585952/APROL_R42_A1_ReleaseNotes_001.pdf
Restart Required: Yes
Instructions:
1. Download APROL R4.2 V7.08 or later from B&R Industrial Automation. 2. Follow vendor upgrade procedures. 3. Restart APROL services. 4. Verify the EnMon PHP script no longer contains SQL injection vulnerabilities.
🔧 Temporary Workarounds
Network Segmentation
allIsolate APROL systems from untrusted networks and internet access
Web Application Firewall
allDeploy WAF with SQL injection protection rules
🧯 If You Can't Patch
- Implement strict network segmentation to isolate APROL from other networks
- Deploy intrusion detection/prevention systems with SQL injection signatures
🔍 How to Verify
Check if Vulnerable:
Check APROL version: if version is earlier than R4.2 V7.08, system is vulnerable. Review system logs for SQL injection attempts against EnMon PHP endpoints.Check Version:
Check APROL administration interface or system documentation for version informationVerify Fix Applied:
Verify APROL version is R4.2 V7.08 or later. Test EnMon PHP endpoints with SQL injection payloads to confirm they are properly sanitized.📡 Detection & Monitoring
Log Indicators:
- Unusual SQL queries in database logs
- Multiple failed login attempts via EnMon PHP
- SQL syntax errors in web server logs
Network Indicators:
- SQL injection patterns in HTTP requests to EnMon PHP endpoints
- Unusual database connections from web server
SIEM Query:
source="web_logs" AND (url="*enmon*" AND (query="*' OR *" OR query="*;--*" OR query="*UNION*"))