CVE-2023-33617
📋 TL;DR
This CVE describes an OS command injection vulnerability in Parks Fiberlink 210 routers that allows attackers to execute arbitrary commands on the device. Attackers can exploit this by injecting malicious commands through the /boaform/admin/formPing target_addr parameter. This affects organizations using Parks Fiberlink 210 routers with vulnerable firmware.
💻 Affected Systems
- Parks Fiberlink 210
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to network infiltration, data exfiltration, and use as a pivot point for attacking internal networks.
Likely Case
Unauthorized command execution allowing configuration changes, credential harvesting, or installation of persistent backdoors.
If Mitigated
Limited impact due to network segmentation, proper access controls, and monitoring preventing successful exploitation.
🎯 Exploit Status
Exploitation requires authentication to the web interface. The vulnerability is in a ping diagnostic form that doesn't properly sanitize user input.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: No
Instructions:
No official patch available. Contact Parks for firmware updates or consider replacing affected devices.
🔧 Temporary Workarounds
Disable Web Administration Interface
allDisable the web interface if not required for operations
Router-specific configuration commands to disable web admin
Network Access Control
linuxRestrict access to router administration interface using firewall rules
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
🧯 If You Can't Patch
- Implement strict network segmentation to isolate affected routers
- Monitor for unusual outbound connections or command execution patterns
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface or CLI. If version is V2.1.14_X000, device is vulnerable.Check Version:
Check web interface System Status page or use CLI command specific to Parks routersVerify Fix Applied:
Verify firmware has been updated to a version newer than V2.1.14_X000📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in system logs
- Multiple failed authentication attempts followed by successful login
- Ping commands with unusual parameters
Network Indicators:
- Unusual outbound connections from router
- Traffic to unexpected destinations
- Multiple authentication attempts to router web interface
SIEM Query:
source="router_logs" AND ("formPing" OR "target_addr") AND (cmd.exe OR bash OR sh OR | OR ; OR &)