CVE-2020-6880
📋 TL;DR
This is a critical SQL injection vulnerability in ZXELINK wireless controllers that allows remote attackers to execute arbitrary SQL commands without authentication. Successful exploitation grants administrative privileges to the attacker. All ZXV10 W908 devices running versions before MIPS_A_1022IPV6R3T6P7Y20 are affected.
💻 Affected Systems
- ZXV10 W908 Wireless Controller
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the wireless controller, allowing attacker to reconfigure network settings, intercept traffic, deploy malware to connected devices, and establish persistent backdoor access.
Likely Case
Attacker gains administrative access to the controller, enabling them to modify network configurations, disrupt wireless services, and potentially pivot to other network segments.
If Mitigated
If properly segmented and protected, impact limited to the wireless network segment with potential service disruption but no lateral movement to critical systems.
🎯 Exploit Status
SQL injection vulnerabilities are typically easy to exploit with readily available tools. The unauthenticated nature makes this particularly dangerous.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: MIPS_A_1022IPV6R3T6P7Y20 or later
Vendor Advisory: http://www.zxelink.com.cn/website/html/CommonContent.html?classify=news&id=43&menuID=20201126153313319
Restart Required: Yes
Instructions:
1. Download firmware version MIPS_A_1022IPV6R3T6P7Y20 or later from ZXELINK website. 2. Log into controller web interface. 3. Navigate to System Maintenance > Firmware Upgrade. 4. Upload the new firmware file. 5. Wait for upgrade to complete and system to reboot.
🔧 Temporary Workarounds
Network Segmentation
allIsolate wireless controllers from untrusted networks and restrict access to management interfaces
Access Control Lists
allImplement firewall rules to restrict access to controller management interfaces to authorized IP addresses only
🧯 If You Can't Patch
- Immediately remove affected devices from internet-facing positions and place behind strict firewall rules
- Implement network monitoring for SQL injection attempts and unauthorized configuration changes
🔍 How to Verify
Check if Vulnerable:
Check firmware version in web interface under System Information. If version is earlier than MIPS_A_1022IPV6R3T6P7Y20, device is vulnerable.Check Version:
No CLI command available. Must check via web interface at System Information page.Verify Fix Applied:
After patching, verify firmware version shows MIPS_A_1022IPV6R3T6P7Y20 or later in System Information.📡 Detection & Monitoring
Log Indicators:
- Unusual SQL query patterns in web server logs
- Multiple failed login attempts followed by successful admin access
- Configuration changes from unexpected IP addresses
Network Indicators:
- SQL injection patterns in HTTP requests to controller management interface
- Unexpected administrative traffic from non-standard sources
SIEM Query:
http.method:POST AND http.uri:"/login" AND (http.query:*sql* OR http.query:*union* OR http.query:*select*)