CVE-2024-8234
📋 TL;DR
An unauthenticated command injection vulnerability in Zyxel NWA1100-N firmware allows attackers to execute arbitrary OS commands and access system files. This affects devices running firmware version 1.00(AACE.1)C0. Since the device is end-of-life, no official patches are available.
💻 Affected Systems
- Zyxel NWA1100-N
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing persistent backdoor installation, credential theft, and lateral movement to connected networks.
Likely Case
Unauthenticated remote code execution leading to device takeover, data exfiltration, and use as attack platform.
If Mitigated
Limited impact if device is isolated behind firewalls with strict network controls and access restrictions.
🎯 Exploit Status
Proof-of-concept code is publicly available. Exploitation requires network access to device web interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: None available - device is end-of-life
Vendor Advisory: https://webservice.zyxel.com/eol/ArchivedEOLModel.pdf
Restart Required: No
Instructions:
No official patch available. Device is end-of-life. Consider replacement with supported hardware.
🔧 Temporary Workarounds
Network Isolation
allPlace device behind firewall with strict inbound rules, blocking all external access to web interface ports.
Access Control Lists
allImplement network ACLs to restrict access to device management interface to trusted IP addresses only.
🧯 If You Can't Patch
- Immediately remove device from internet-facing positions and place behind strict firewall rules.
- Consider replacing with supported hardware that receives security updates.
🔍 How to Verify
Check if Vulnerable:
Check firmware version via web interface at System > Status > Firmware Version. If version is 1.00(AACE.1)C0, device is vulnerable.Check Version:
No CLI command available. Check via web interface or device label.Verify Fix Applied:
No fix available to verify. Only mitigation is device replacement or network isolation.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /cgi-bin/ forms (formSysCmd, formUpgradeCert, formDelcert)
- Unexpected command execution in system logs
Network Indicators:
- HTTP POST requests to vulnerable endpoints from untrusted sources
- Unusual outbound connections from device
SIEM Query:
source="zyxel_nwa1100" AND (uri_path="/cgi-bin/*" AND method="POST" AND (uri_query CONTAINS "formSysCmd" OR uri_query CONTAINS "formUpgradeCert" OR uri_query CONTAINS "formDelcert"))