CVE-2020-21883
📋 TL;DR
This CVE describes an OS command injection vulnerability in Unibox network devices that allows attackers to execute arbitrary commands on the system. The vulnerability exists in the /tools/ping endpoint and can lead to complete device compromise. Affected systems include Unibox U-50 2.4, UniBox Enterprise Series 2.4, and UniBox Campus Series 2.4.
💻 Affected Systems
- Unibox U-50
- UniBox Enterprise Series
- UniBox Campus Series
📦 What is this software?
Unibox U1000 Firmware by Indionetworks
Unibox U2500 Firmware by Indionetworks
Unibox U50 Firmware by Indionetworks
Unibox U500 Firmware by Indionetworks
Unibox U5000 Firmware by Indionetworks
⚠️ Risk & Real-World Impact
Worst Case
Complete device takeover with root/system-level access, allowing attackers to install persistent backdoors, pivot to internal networks, exfiltrate data, or use the device for further attacks.
Likely Case
Remote code execution leading to device compromise, credential theft, network reconnaissance, and potential lateral movement within the network.
If Mitigated
Limited impact if proper network segmentation, access controls, and monitoring are in place, though the vulnerability still exists.
🎯 Exploit Status
The vulnerability is in a ping utility endpoint, making exploitation straightforward with publicly available proof-of-concept details.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No official vendor advisory found
Restart Required: No
Instructions:
No official patch available. Check with vendor wifi-soft.com for potential firmware updates.
🔧 Temporary Workarounds
Disable web interface
allDisable the web management interface if not required for operations
Device-specific configuration command to disable web interface
Network access control
linuxRestrict access to device management interface using firewall rules
iptables -A INPUT -p tcp --dport 80 -s trusted_ip -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s trusted_ip -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
🧯 If You Can't Patch
- Segment affected devices in isolated network zones with strict firewall rules
- Implement network monitoring and IDS/IPS rules to detect exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface or CLI. If version is 2.4, device is vulnerable.Check Version:
Check via web interface at System > About or using device-specific CLI commandsVerify Fix Applied:
Verify firmware has been updated to a version later than 2.4 or that workarounds have been implemented.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /tools/ping endpoint
- Suspicious command execution in system logs
- Multiple failed authentication attempts followed by ping requests
Network Indicators:
- Unusual outbound connections from device
- Traffic to known malicious IPs
- Unexpected SSH or reverse shell connections
SIEM Query:
source="unibox" AND (url="/tools/ping" OR cmd="ping" AND suspicious_patterns)