CVE-2024-46916
📋 TL;DR
This vulnerability in Diebold Nixdorf Vynamic Security Suite allows attackers to delete critical system files before filesystem mounting, potentially enabling code execution and recovery of TPM Disk Encryption keys. It affects organizations using Diebold Nixdorf banking security software through version 4.3.0 SR06.
💻 Affected Systems
- Diebold Nixdorf Vynamic Security Suite
📦 What is this software?
Vynamic Security Suite by Dieboldnixdorf
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with TPM key recovery leading to decryption of Windows system partition and complete data exposure.
Likely Case
System instability or denial of service through critical file deletion, with potential for privilege escalation.
If Mitigated
Limited impact if proper access controls and monitoring prevent unauthorized script execution.
🎯 Exploit Status
Exploitation requires ability to execute scripts or commands in the init.d context before filesystem mounting.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 4.3.0 SR06
Vendor Advisory: https://www.dieboldnixdorf.com/en-us/banking/portfolio/software/security/
Restart Required: Yes
Instructions:
1. Contact Diebold Nixdorf support for latest patches. 2. Apply security updates to Vynamic Security Suite. 3. Restart affected systems. 4. Verify patch installation.
🔧 Temporary Workarounds
Restrict init.d script permissions
linuxRemove execute permissions from vulnerable init.d scripts to prevent unauthorized deletion calls
chmod -x /etc/rc.d/init.d/mountfs
Monitor critical file changes
allImplement file integrity monitoring on /etc/fstab and other critical system files
🧯 If You Can't Patch
- Implement strict access controls to prevent unauthorized users from executing init.d scripts
- Deploy network segmentation to isolate Vynamic Security Suite systems from untrusted networks
🔍 How to Verify
Check if Vulnerable:
Check Vynamic Security Suite version and verify if /etc/rc.d/init.d/mountfs contains delete calls for critical filesCheck Version:
Check Vynamic Security Suite administration interface or contact Diebold Nixdorf support for version informationVerify Fix Applied:
Verify updated version is installed and examine patched mountfs script for removal of vulnerable delete functionality📡 Detection & Monitoring
Log Indicators:
- Unexpected file deletion events in system logs
- Init.d script execution errors
- Filesystem mount failures
Network Indicators:
- Unusual administrative access to security suite management interfaces
SIEM Query:
source="system_logs" AND (event="file_deletion" AND file_path="/etc/fstab") OR (process="/etc/rc.d/init.d/mountfs" AND action="delete")