CVE-2016-10760
📋 TL;DR
This CVE describes a command injection vulnerability in Seowon Intech routers that allows remote attackers to execute arbitrary commands via shell metacharacters in the ping_ipaddr parameter of diagnostic.cgi. Attackers can gain root access to affected routers, potentially compromising entire networks. Organizations using vulnerable Seowon Intech router models are affected.
💻 Affected Systems
- Seowon Intech routers
📦 What is this software?
Swr 300a Firmware by Seowonintech
Swr 300b Firmware by Seowonintech
Swr 300bg Firmware by Seowonintech
Swr 300c Firmware by Seowonintech
⚠️ Risk & Real-World Impact
Worst Case
Complete router compromise leading to full network takeover, data exfiltration, persistent backdoor installation, and use as pivot point for internal network attacks.
Likely Case
Router compromise allowing traffic interception, credential theft, network reconnaissance, and potential lateral movement to connected systems.
If Mitigated
Limited impact if routers are behind firewalls with strict ingress filtering and network segmentation prevents lateral movement.
🎯 Exploit Status
Exploitation requires sending specially crafted HTTP requests to the diagnostic.cgi endpoint with shell metacharacters in the ping_ipaddr parameter.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Specific version not publicly documented
Vendor Advisory: Not publicly available
Restart Required: Yes
Instructions:
1. Contact Seowon Intech for firmware updates. 2. Download latest firmware from vendor portal. 3. Backup router configuration. 4. Upload and apply firmware update via web interface. 5. Verify update applied successfully.
🔧 Temporary Workarounds
Disable diagnostic.cgi endpoint
linuxBlock or disable access to the vulnerable diagnostic.cgi endpoint
# Modify router configuration to remove/disable diagnostic.cgi
# Use iptables to block access: iptables -A INPUT -p tcp --dport 80 -m string --string "diagnostic.cgi" --algo bm -j DROP
Network segmentation and firewall rules
allIsolate routers and restrict access to management interfaces
# Restrict access to router management interface: iptables -A INPUT -s trusted_networks -p tcp --dport 80 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
🧯 If You Can't Patch
- Segment routers into isolated network zones with strict firewall rules preventing external and lateral access
- Implement network monitoring and intrusion detection specifically for command injection attempts against router management interfaces
🔍 How to Verify
Check if Vulnerable:
Test by sending HTTP POST request to diagnostic.cgi with shell metacharacters in ping_ipaddr parameter and observing command execution responseCheck Version:
Check router web interface for firmware version or use: cat /proc/versionVerify Fix Applied:
Attempt exploitation after patch application; successful fix should reject shell metacharacters and not execute commands📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to diagnostic.cgi with special characters
- Router logs showing command execution attempts
- Web server logs with shell metacharacters in parameters
Network Indicators:
- HTTP POST requests to diagnostic.cgi containing |, ;, $, &, or backticks in parameters
- Unexpected outbound connections from router
SIEM Query:
source="router_logs" AND (uri="*diagnostic.cgi*" AND (param="*|*" OR param="*;*" OR param="*`*" OR param="*$*"))