CVE-2024-30247
📋 TL;DR
CVE-2024-30247 is a critical command injection vulnerability in NextCloudPi that allows unauthenticated attackers to execute arbitrary commands as root via the web panel. This affects all NextCloudPi installations with the vulnerable web panel accessible. Anyone with network access to the NextCloudPi interface can exploit this without credentials.
💻 Affected Systems
- NextCloudPi
📦 What is this software?
Nextcloudpi by Nextcloud
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise: attacker gains root shell, installs persistent backdoors, steals all data, pivots to other systems, or deploys ransomware.
Likely Case
Attacker executes commands to steal Nextcloud data, install cryptocurrency miners, or create backdoor access for future attacks.
If Mitigated
No impact if system is patched or web panel is not accessible from untrusted networks.
🎯 Exploit Status
The vulnerability is trivial to exploit - attackers can send crafted HTTP requests to execute commands. Public proof-of-concept code is available in the advisory.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.53.1
Vendor Advisory: https://github.com/nextcloud/nextcloudpi/security/advisories/GHSA-m597-72v7-j982
Restart Required: Yes
Instructions:
1. Backup your Nextcloud data. 2. Update NextCloudPi using: sudo ncp-update. 3. Verify update with: sudo ncp-version. 4. Restart the system or NextCloudPi services.
🔧 Temporary Workarounds
Disable web panel access
linuxBlock external access to NextCloudPi web panel while waiting to patch
sudo ufw deny 4443/tcp
sudo iptables -A INPUT -p tcp --dport 4443 -j DROP
Restrict web panel to localhost
linuxConfigure web panel to only listen on localhost interface
Edit /etc/apache2/sites-available/ncp-webpanel.conf and change bind address to 127.0.0.1
sudo systemctl restart apache2
🧯 If You Can't Patch
- Immediately disable the NextCloudPi web panel service entirely
- Place NextCloudPi behind a firewall that only allows trusted IP addresses to access port 4443
🔍 How to Verify
Check if Vulnerable:
Check if NextCloudPi version is below 1.53.1: sudo ncp-versionCheck Version:
sudo ncp-versionVerify Fix Applied:
Verify version is 1.53.1 or higher: sudo ncp-version📡 Detection & Monitoring
Log Indicators:
- Unusual commands in /var/log/apache2/access.log or error.log
- Suspicious POST requests to web panel endpoints
- Root command execution from web panel process
Network Indicators:
- Unusual outbound connections from NextCloudPi system
- Command and control traffic patterns
- Unexpected port scans or brute force attempts
SIEM Query:
source="apache" AND (url="*ncp*" OR url="*webpanel*") AND (method="POST" OR status="200") AND size>1000