CVE-2022-43764
📋 TL;DR
This vulnerability in B&R APROL Tbase server allows attackers to cause buffer overflow through insufficient input validation when changing configurations. Successful exploitation could lead to denial-of-service or arbitrary code execution with high privileges. Affects B&R APROL systems running versions before R 4.2-07.
💻 Affected Systems
- B&R APROL
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with SYSTEM/root privileges leading to complete system compromise, lateral movement, and persistent access to industrial control systems.
Likely Case
Denial-of-service causing APROL system crashes and disruption of industrial processes, potentially requiring physical intervention to restart equipment.
If Mitigated
Limited to denial-of-service if memory protections (ASLR, DEP) are effective, but still causing operational disruption.
🎯 Exploit Status
CVSS 9.8 suggests low attack complexity. No authentication required. Buffer overflow vulnerabilities in industrial systems are attractive targets for attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: R 4.2-07 and later
Vendor Advisory: https://www.br-automation.com/downloads_br_productcatalogue/assets/1674823095245-en-original-1.0.pdf
Restart Required: Yes
Instructions:
1. Download APROL version R 4.2-07 or later from B&R Automation website. 2. Backup current configuration and data. 3. Install the update following vendor documentation. 4. Restart APROL services. 5. Verify system functionality.
🔧 Temporary Workarounds
Network Segmentation
allIsolate APROL systems from untrusted networks and implement strict firewall rules to limit access to Tbase server ports.
Access Control Restrictions
allImplement strict network access controls to limit which systems can communicate with APROL Tbase server.
🧯 If You Can't Patch
- Implement strict network segmentation to isolate APROL systems from all untrusted networks
- Deploy intrusion detection/prevention systems with rules specifically monitoring for buffer overflow attempts against APROL services
🔍 How to Verify
Check if Vulnerable:
Check APROL version in system administration interface or configuration files. If version is below R 4.2-07, system is vulnerable.Check Version:
Check APROL version via system administration panel or consult APROL documentation for version checking commands specific to your installation.Verify Fix Applied:
Verify APROL version shows R 4.2-07 or higher in system administration interface and confirm Tbase server is running updated version.📡 Detection & Monitoring
Log Indicators:
- Unusual configuration change attempts to Tbase server
- APROL service crashes or restarts
- Memory access violation errors in system logs
Network Indicators:
- Unusual traffic patterns to Tbase server ports
- Multiple configuration change requests in short timeframes
- Traffic containing unusually long parameter values
SIEM Query:
source="aprol_logs" AND (event_type="service_crash" OR event_type="configuration_change" OR message="*buffer*" OR message="*overflow*")