CVE-2022-24262
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary commands on Voipmonitor GUI systems by uploading a malicious file to the web root. Attackers can exploit the config restore function's insufficient file validation to achieve remote code execution. Systems running Voipmonitor GUI versions before v24.96 with the web interface exposed are affected.
💻 Affected Systems
- Voipmonitor GUI
📦 What is this software?
Voipmonitor by Voipmonitor
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining root/administrator privileges, installing persistent backdoors, exfiltrating sensitive VoIP call data, and pivoting to other network systems.
Likely Case
Attackers gain shell access to the Voipmonitor server, allowing them to steal call metadata, modify configurations, disrupt monitoring services, or use the system as a foothold for further attacks.
If Mitigated
If proper network segmentation and access controls are in place, impact is limited to the Voipmonitor system itself without lateral movement to other critical systems.
🎯 Exploit Status
Exploitation requires access to the web interface but does not require authentication if the interface is publicly accessible without authentication. The vulnerability is well-documented with technical details available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v24.96 and later
Vendor Advisory: https://www.voipmonitor.org/changelog-gui?major=5
Restart Required: Yes
Instructions:
1. Download Voipmonitor GUI v24.96 or later from the official website. 2. Backup current configuration. 3. Stop the Voipmonitor service. 4. Install the updated version. 5. Restart the service. 6. Verify the version is v24.96 or higher.
🔧 Temporary Workarounds
Disable Web Interface Access
linuxRestrict access to the Voipmonitor GUI web interface to trusted IP addresses only using firewall rules.
iptables -A INPUT -p tcp --dport [VOIPMONITOR_PORT] -s [TRUSTED_IP] -j ACCEPT
iptables -A INPUT -p tcp --dport [VOIPMONITOR_PORT] -j DROP
Remove Config Restore Functionality
allDisable or remove the config restore feature from the web interface if not needed.
# Modify web application configuration to disable restore functionality
# Consult Voipmonitor documentation for specific configuration changes
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Voipmonitor systems from critical infrastructure
- Deploy a web application firewall (WAF) with rules to block malicious file uploads and command injection attempts
🔍 How to Verify
Check if Vulnerable:
Check the Voipmonitor GUI version via the web interface dashboard or configuration files. If version is below 24.96, the system is vulnerable.Check Version:
grep 'version' /usr/local/voipmonitor/version.txt 2>/dev/null || echo 'Check web interface dashboard'Verify Fix Applied:
After patching, verify the version shows 24.96 or higher in the web interface and test that config restore functionality properly validates uploaded files.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads to config restore endpoint
- Suspicious commands executed from web process
- Failed authentication attempts to web interface
Network Indicators:
- HTTP POST requests to /gui/restore.php or similar restore endpoints
- Outbound connections from Voipmonitor server to suspicious IPs
SIEM Query:
source="voipmonitor" AND (url="*restore*" OR process="*sh*" OR process="*bash*")