CVE-2019-19874
📋 TL;DR
CVE-2019-19874 is a command injection vulnerability in B&R Industrial Automation APROL web interface that allows attackers to execute arbitrary commands on the web server. This affects APROL systems before version R4.2 V7.08. Industrial control systems using vulnerable APROL versions are at risk of remote compromise.
💻 Affected Systems
- B&R Industrial Automation APROL
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to execute arbitrary commands with web server privileges, potentially leading to industrial process disruption, data theft, or lateral movement within OT networks.
Likely Case
Remote code execution leading to web server compromise, potential data exfiltration, and unauthorized access to industrial control systems.
If Mitigated
Limited impact if proper network segmentation, web application firewalls, and least privilege principles are implemented.
🎯 Exploit Status
Command injection vulnerabilities typically have low exploitation complexity. No public exploit code found, but weaponization is likely given CVSS 9.8 score and industrial control system target.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: R4.2 V7.08 or 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. Backup current configuration and data. 3. Apply the update following vendor documentation. 4. Restart the system. 5. Verify the update was successful.
🔧 Temporary Workarounds
Network Segmentation
allIsolate APROL systems from untrusted networks and implement strict firewall rules.
Web Application Firewall
allDeploy WAF with command injection protection rules to block exploitation attempts.
🧯 If You Can't Patch
- Implement strict network segmentation to isolate APROL systems from untrusted networks
- Deploy web application firewall with command injection protection rules
🔍 How to Verify
Check if Vulnerable:
Check APROL version via web interface or system configuration. If version is earlier than R4.2 V7.08, system is vulnerable.Check Version:
Check APROL web interface or consult system documentation for version informationVerify Fix Applied:
Verify APROL version is R4.2 V7.08 or later via system administration interface.📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in web server logs
- Suspicious HTTP requests to web scripts with command injection patterns
- Unexpected process creation from web server
Network Indicators:
- HTTP requests containing command injection patterns (semicolons, pipes, backticks) to APROL web endpoints
- Unusual outbound connections from web server
SIEM Query:
source="aprol_web_logs" AND (http_uri="*;*" OR http_uri="*|*" OR http_uri="*`*" OR http_uri="*$(*")