CVE-2024-22942
📋 TL;DR
This CVE describes a command injection vulnerability in TOTOLINK A3300R routers that allows attackers to execute arbitrary commands on the device. Attackers can exploit this by sending specially crafted input to the hostName parameter in the setWanCfg function. This affects users of TOTOLINK A3300R routers with the vulnerable firmware version.
💻 Affected Systems
- TOTOLINK A3300R
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the router allowing full remote control, credential theft, network pivoting, and persistent backdoor installation.
Likely Case
Router takeover leading to DNS hijacking, traffic interception, credential harvesting, and botnet recruitment.
If Mitigated
Limited impact with proper network segmentation and firewall rules preventing external access to management interfaces.
🎯 Exploit Status
Exploitation requires authentication to the router's web interface. Public proof-of-concept exists in GitHub repository.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: Yes
Instructions:
1. Check TOTOLINK website for firmware updates
2. Download latest firmware for A3300R
3. Access router web interface
4. Navigate to System Tools > Firmware Upgrade
5. Upload new firmware file
6. Wait for reboot and verify version
🔧 Temporary Workarounds
Disable WAN Management Access
allPrevent external access to router management interface
Access router web interface > Advanced > Security > Remote Management > Disable
Change Default Credentials
allUse strong unique credentials to reduce attack surface
Access router web interface > Advanced > System > Account > Change admin password
🧯 If You Can't Patch
- Segment router on isolated network VLAN
- Implement strict firewall rules blocking all external access to router management ports (typically 80, 443, 8080)
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in web interface: Advanced > System > Status > Firmware VersionCheck Version:
curl -s http://router-ip/cgi-bin/luci/ | grep firmwareVerify Fix Applied:
Verify firmware version is newer than V17.0.0cu.557_B20221024📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /cgi-bin/luci with hostName parameter containing shell metacharacters
- Multiple failed authentication attempts followed by successful login
Network Indicators:
- Unusual outbound connections from router to unknown IPs
- DNS queries to suspicious domains from router
SIEM Query:
source="router.log" AND ("setWanCfg" OR "hostName") AND ("|" OR ";" OR "$" OR "`" OR "&" OR "&&" OR "||")