CVE-2024-8133
📋 TL;DR
This critical vulnerability allows remote attackers to execute arbitrary commands on affected D-Link NAS devices via command injection in the HTTP POST handler. It affects multiple end-of-life D-Link NAS models. Attackers can exploit this without authentication to gain full system control.
💻 Affected Systems
- D-Link DNS-120
- DNR-202L
- DNS-315L
- DNS-320
- DNS-320L
- DNS-320LW
- DNS-321
- DNR-322L
- DNS-323
- DNS-325
- DNS-326
- DNS-327L
- DNR-326
- DNS-340L
- DNS-343
- DNS-345
- DNS-726-4
- DNS-1100-4
- DNS-1200-05
- DNS-1550-04
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to install malware, steal data, pivot to internal networks, or use devices for botnets.
Likely Case
Remote code execution leading to data theft, ransomware deployment, or device takeover for malicious activities.
If Mitigated
Limited impact if devices are isolated behind firewalls with strict network controls and no internet exposure.
🎯 Exploit Status
Public exploit code exists on GitHub. Attack requires sending crafted HTTP POST request to /cgi-bin/hd_config.cgi with malicious f_source_dev parameter.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: None
Vendor Advisory: https://supportannouncement.us.dlink.com/security/publication.aspx?name=SAP10383
Restart Required: No
Instructions:
No official patch available. Vendor recommends retiring and replacing all affected devices as they are end-of-life.
🔧 Temporary Workarounds
Network Isolation
linuxBlock all external access to affected devices at network perimeter
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
Access Control
linuxRestrict web interface access to trusted IP addresses only
iptables -A INPUT -p tcp --dport 80 -s 192.168.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
🧯 If You Can't Patch
- Immediately disconnect affected devices from internet and place behind strict firewall rules
- Replace all affected devices with supported alternatives as soon as possible
🔍 How to Verify
Check if Vulnerable:
Check device model and firmware version against affected list. Test by attempting exploitation (not recommended in production).Check Version:
Check web interface admin page or use: cat /etc/version on device shellVerify Fix Applied:
No fix available to verify. Verify devices are properly isolated or replaced.📡 Detection & Monitoring
Log Indicators:
- HTTP POST requests to /cgi-bin/hd_config.cgi with unusual f_source_dev parameter values
- Unusual command execution in system logs
Network Indicators:
- HTTP traffic to device web interface with POST requests containing shell metacharacters in parameters
SIEM Query:
source="web_logs" AND uri="/cgi-bin/hd_config.cgi" AND method="POST" AND (param="f_source_dev" AND value MATCHES "[;|&`$()]+")