CVE-2024-3659
📋 TL;DR
This vulnerability allows authenticated attackers with administrative access to KAON AR2140 routers to execute arbitrary shell commands via crafted requests to specific endpoints. Attackers can gain full control of affected routers, potentially compromising network security. Only users of KAON AR2140 routers with firmware versions older than 3.2.50 or 4.2.16 are affected.
💻 Affected Systems
- KAON AR2140 router
📦 What is this software?
Ar2140 Firmware by Kaongroup
⚠️ Risk & Real-World Impact
Worst Case
Complete router compromise leading to network interception, credential theft, lateral movement to internal systems, and persistent backdoor installation.
Likely Case
Router takeover enabling traffic monitoring, DNS hijacking, and credential harvesting from connected devices.
If Mitigated
Limited impact if strong administrative authentication and network segmentation are implemented, though router control remains possible.
🎯 Exploit Status
Exploitation requires administrative credentials; public technical details available in CERT-PL advisory.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firmware version 3.2.50 or 4.2.16
Vendor Advisory: https://cert.pl/en/posts/2024/08/CVE-2024-3659
Restart Required: Yes
Instructions:
1. Download latest firmware from KAON support portal. 2. Log into router admin interface. 3. Navigate to firmware update section. 4. Upload and apply firmware update. 5. Reboot router.
🔧 Temporary Workarounds
Restrict administrative access
linuxLimit administrative portal access to trusted IP addresses only
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
Change default credentials
allUse strong, unique administrative passwords
🧯 If You Can't Patch
- Replace vulnerable routers with updated models
- Implement network segmentation to isolate router from critical systems
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router admin interface under System Status or About sectionsCheck Version:
Login to router web interface and navigate to System > Status or similar menuVerify Fix Applied:
Confirm firmware version shows 3.2.50 or higher (for 3.x branch) or 4.2.16 or higher (for 4.x branch)📡 Detection & Monitoring
Log Indicators:
- Unusual administrative login attempts
- HTTP requests to router endpoints with shell metacharacters
- Unexpected system command execution in logs
Network Indicators:
- Suspicious outbound connections from router
- Unusual traffic patterns from router management interface
SIEM Query:
source="router_logs" AND (uri="*cmd=*" OR uri="*|*" OR uri="*;*" OR uri="*`*" OR uri="*$(*")