CVE-2022-50793
📋 TL;DR
This vulnerability allows authenticated attackers to execute arbitrary system commands on SOUND4 IMPACT/FIRST/PULSE/Eco systems through command injection in the www-data-handler.php script. Attackers can exploit this by sending malicious 'services' parameter values to gain www-data user privileges. Organizations using affected SOUND4 products up to version 2.x are vulnerable.
💻 Affected Systems
- SOUND4 IMPACT
- SOUND4 FIRST
- SOUND4 PULSE
- SOUND4 Eco
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to install persistent backdoors, exfiltrate sensitive data, pivot to other systems, or disrupt critical operations.
Likely Case
Unauthorized system access leading to data theft, service disruption, or use as a foothold for lateral movement within the network.
If Mitigated
Limited impact if proper network segmentation, least privilege access, and monitoring are in place to contain the www-data user's capabilities.
🎯 Exploit Status
Exploit details and proof-of-concept code are publicly available, making this easy to weaponize by attackers with valid credentials.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.sound4.com/
Restart Required: No
Instructions:
Check vendor website for security updates. If no patch is available, implement workarounds and consider upgrading to newer versions if they exist.
🔧 Temporary Workarounds
Input Validation and Sanitization
linuxImplement strict input validation and sanitization for the 'services' parameter in www-data-handler.php to prevent command injection.
Modify www-data-handler.php to validate and sanitize user input before processing
Access Control Restrictions
linuxRestrict access to the vulnerable script through web server configuration or network controls.
Add access control rules in Apache/Nginx configuration to limit access to www-data-handler.php
🧯 If You Can't Patch
- Implement strict network segmentation to isolate affected systems from critical assets
- Enforce strong authentication policies and monitor for suspicious authentication attempts
🔍 How to Verify
Check if Vulnerable:
Check if www-data-handler.php exists and accepts 'services' parameter without proper input validation. Test with controlled command injection payloads in a safe environment.Check Version:
Check product documentation or web interface for version information. Command may vary by installation.Verify Fix Applied:
Test that command injection attempts via the 'services' parameter are properly blocked or sanitized. Verify that input validation is implemented.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to www-data-handler.php with suspicious 'services' parameter values
- System command execution by www-data user from web processes
Network Indicators:
- HTTP requests containing shell metacharacters or command injection patterns in POST data
SIEM Query:
source="web_logs" AND uri="*www-data-handler.php*" AND (param="services" AND value="*;*" OR value="*|*" OR value="*`*" OR value="*$(*")🔗 References
- https://exchange.xforce.ibmcloud.com/vulnerabilities/247917
- https://packetstormsecurity.com/files/170264/SOUND4-IMPACT-FIRST-PULSE-Eco-2.x-services-Command-Injection.html
- https://www.sound4.com/
- https://www.vulncheck.com/advisories/sound-impactfirstpulseeco-x-authenticated-command-injection-via-www-data-handlerphp
- https://www.zeroscience.mk/en/vulnerabilities/ZSL-2022-5737.php
