CVE-2017-14135
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary operating system commands on opendreambox 2.0.0 systems via shell metacharacters in the command parameter to the /script URI in the webadmin plugin. It affects systems running opendreambox 2.0.0 with the webadmin plugin enabled. Attackers can gain full control of affected systems without authentication.
💻 Affected Systems
- opendreambox
📦 What is this software?
Opendreambox by Dreambox
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to install malware, exfiltrate data, pivot to other systems, or use the system for botnet activities.
Likely Case
Remote code execution leading to system takeover, data theft, or deployment of cryptocurrency miners or ransomware.
If Mitigated
No impact if the webadmin plugin is disabled or proper network segmentation prevents access to the vulnerable endpoint.
🎯 Exploit Status
Exploitation is straightforward using curl or similar tools to send malicious commands to the /script endpoint. The referenced blog post demonstrates practical exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch exists. The recommended approach is to disable the webadmin plugin or upgrade to a newer version of opendreambox if available.
🔧 Temporary Workarounds
Disable webadmin plugin
linuxRemove or disable the vulnerable webadmin plugin to eliminate the attack surface
Remove the webadmin plugin files or disable via plugin manager
Network access control
linuxRestrict network access to the opendreambox web interface using firewall rules
iptables -A INPUT -p tcp --dport 80 -s trusted_network -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
🧯 If You Can't Patch
- Disable the webadmin plugin immediately
- Implement strict network segmentation and firewall rules to block all external access to the opendreambox web interface
🔍 How to Verify
Check if Vulnerable:
Check if opendreambox 2.0.0 is running with webadmin plugin enabled and accessible via networkCheck Version:
Check opendreambox version via system information or package managerVerify Fix Applied:
Verify webadmin plugin is disabled or removed, and test that /script endpoint no longer responds📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /script endpoint
- Commands with shell metacharacters in web logs
- Unexpected process execution from web server context
Network Indicators:
- HTTP POST requests to /script with command parameters containing shell metacharacters
- Outbound connections from opendreambox to unexpected destinations
SIEM Query:
web_access_logs WHERE url_path CONTAINS '/script' AND (request_body CONTAINS ';' OR request_body CONTAINS '|' OR request_body CONTAINS '&' OR request_body CONTAINS '`' OR request_body CONTAINS '$(')