CVE-2019-12518
📋 TL;DR
CVE-2019-12518 is a buffer overflow vulnerability in Anviz CrossChex access control management software that allows remote attackers to execute arbitrary code on affected systems. This affects organizations using vulnerable versions of the software for physical access control management. The vulnerability is particularly dangerous because it can be exploited without authentication.
💻 Affected Systems
- Anviz CrossChex
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, attacker gaining administrative control over access control systems, potential physical security breach
Likely Case
Remote code execution allowing attacker to install malware, steal credentials, or disrupt access control operations
If Mitigated
Limited impact if system is isolated, properly segmented, and monitored with intrusion detection
🎯 Exploit Status
Public exploit code available, no authentication required, making this easily exploitable
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 4.3.12
Vendor Advisory: Not publicly documented by vendor
Restart Required: Yes
Instructions:
1. Contact Anviz for latest secure version 2. Backup configuration 3. Install updated version 4. Restart system 5. Verify functionality
🔧 Temporary Workarounds
Network Segmentation
allIsolate CrossChex server from untrusted networks and internet
Configure firewall rules to restrict access to CrossChex server
Application Whitelisting
windowsPrevent unauthorized code execution via buffer overflow
Configure Windows AppLocker or similar to restrict executable execution
🧯 If You Can't Patch
- Implement strict network segmentation - isolate CrossChex server to management VLAN only
- Deploy host-based intrusion prevention system (HIPS) with buffer overflow protection
🔍 How to Verify
Check if Vulnerable:
Check CrossChex version in Help > About menu or program files propertiesCheck Version:
Check Help > About in CrossChex application or examine program file propertiesVerify Fix Applied:
Verify version is newer than 4.3.12 and test buffer overflow protection📡 Detection & Monitoring
Log Indicators:
- Unusual process creation from CrossChex.exe
- Memory access violations in Windows event logs
- Network connections to unusual ports from CrossChex
Network Indicators:
- Unusual traffic patterns to CrossChex default port
- Exploit pattern detection in network traffic
SIEM Query:
source="windows" AND (process_name="CrossChex.exe" AND (event_id="4688" OR event_id="4663")) OR (source="firewall" AND dest_port="[CrossChex_port]" AND pattern="buffer_overflow")