CVE-2022-2488
📋 TL;DR
This CVE-2022-2488 is a critical OS command injection vulnerability in WAVLINK WN535K2 and WN535K3 routers. Attackers can execute arbitrary commands on affected devices by manipulating the IP parameter in the /cgi-bin/touchlist_sync.cgi endpoint. This affects users of these specific router models with vulnerable firmware.
💻 Affected Systems
- WAVLINK WN535K2
- WAVLINK WN535K3
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attackers to install persistent backdoors, pivot to internal networks, steal credentials, or use device as botnet node.
Likely Case
Remote code execution leading to device takeover, network traffic interception, and potential lateral movement within the network.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering and network segmentation.
🎯 Exploit Status
Exploit details are publicly available on GitHub. The vulnerability requires no authentication and has simple exploitation vectors.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
Check WAVLINK website for firmware updates. If available, download latest firmware and apply through web interface. No specific patch version information is publicly documented.
🔧 Temporary Workarounds
Block CGI Endpoint
linuxUse firewall rules to block access to the vulnerable endpoint
iptables -A INPUT -p tcp --dport 80 -m string --string "/cgi-bin/touchlist_sync.cgi" --algo bm -j DROP
iptables -A INPUT -p tcp --dport 443 -m string --string "/cgi-bin/touchlist_sync.cgi" --algo bm -j DROP
Disable Web Interface
allDisable the router's web management interface if not needed
Check router admin interface for web management toggle
🧯 If You Can't Patch
- Isolate affected routers in separate VLAN with strict firewall rules
- Implement network monitoring for suspicious traffic to/from router management IP
🔍 How to Verify
Check if Vulnerable:
Check if router responds to requests to /cgi-bin/touchlist_sync.cgi with IP parameter. Use curl: curl -X POST 'http://[ROUTER_IP]/cgi-bin/touchlist_sync.cgi' -d 'IP=test'Check Version:
Check firmware version in router web interface or via SSH if availableVerify Fix Applied:
Test if command injection no longer works. Attempt exploitation with known payloads and verify they fail.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /cgi-bin/touchlist_sync.cgi
- Commands with shell metacharacters in IP parameter
- Multiple failed exploitation attempts
Network Indicators:
- HTTP requests containing shell commands in POST data
- Unusual outbound connections from router after exploitation
SIEM Query:
source="router_logs" AND uri="/cgi-bin/touchlist_sync.cgi" AND (data="*;*" OR data="*|*" OR data="*`*" OR data="*$(*")🔗 References
- https://github.com/1angx/webray.com.cn/blob/main/Wavlink/Wavlink%20touchlist_sync.cgi.md
- https://vuldb.com/?id.204539
- https://github.com/1angx/webray.com.cn/blob/main/Wavlink/Wavlink%20touchlist_sync.cgi.md
- https://vuldb.com/?id.204539
- https://www.talosintelligence.com/vulnerability_reports/TALOS-2024-1999
