CVE-2024-8684
📋 TL;DR
This CVE describes an OS command injection vulnerability in Revolution Pi devices that allows authenticated attackers to execute arbitrary operating system commands. The vulnerability exists in the 'php/dal.php' endpoint via the 'arrSaveConfig' parameter, potentially giving attackers full control of affected devices. Organizations using Revolution Pi version 2022-07-28-revpi-buster are affected.
💻 Affected Systems
- Revolution Pi
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attacker to install persistent backdoors, pivot to internal networks, exfiltrate sensitive data, or use device as part of botnet.
Likely Case
Attacker gains shell access to device, can modify configurations, install unauthorized software, and potentially access connected industrial control systems.
If Mitigated
With proper network segmentation and authentication controls, impact limited to isolated device with minimal sensitive data.
🎯 Exploit Status
Exploitation requires authenticated access to the web interface. The vulnerability is in a specific PHP endpoint that processes configuration data.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check with KUNBUS for updated version
Vendor Advisory: https://www.incibe.es/en/incibe-cert/notices/aviso-sci/multiple-vulnerabilities-kunbus-gmbhs-revolution-pi
Restart Required: No
Instructions:
1. Contact KUNBUS GmbH for patched version 2. Backup current configuration 3. Apply vendor-provided update 4. Verify fix by testing the vulnerable endpoint
🔧 Temporary Workarounds
Disable vulnerable endpoint
allBlock or remove access to the vulnerable php/dal.php endpoint
sudo rm /var/www/html/php/dal.php
sudo chmod 000 /var/www/html/php/dal.php
Restrict web interface access
allLimit access to Revolution Pi web interface to trusted IP addresses only
sudo ufw allow from TRUSTED_IP to any port 80,443
sudo ufw deny 80
sudo ufw deny 443
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Revolution Pi devices from critical systems
- Enforce strong authentication policies and monitor for unauthorized access attempts
🔍 How to Verify
Check if Vulnerable:
Check if file /var/www/html/php/dal.php exists and contains 'arrSaveConfig' parameter processing without proper input validationCheck Version:
cat /etc/revpi/image-releaseVerify Fix Applied:
Test the vulnerable endpoint with controlled input to ensure command injection is no longer possible📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /php/dal.php
- Suspicious command execution in system logs
- Multiple failed authentication attempts followed by successful login
Network Indicators:
- Unexpected outbound connections from Revolution Pi device
- Traffic to known malicious IPs or domains
SIEM Query:
source="revpi-logs" AND (url="/php/dal.php" OR process="bash" OR process="sh")