CVE-2018-25120
📋 TL;DR
This CVE describes a critical command injection vulnerability in D-Link DNS-343 ShareCenter network storage devices. Unauthenticated remote attackers can execute arbitrary shell commands as root by sending specially crafted requests to the Mail Test functionality. This affects all devices running firmware versions up to and including 1.05.
💻 Affected Systems
- D-Link DNS-343 ShareCenter 4-Bay Network Storage Enclosure
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise with root-level access, allowing attackers to install persistent backdoors, steal all stored data, pivot to internal networks, or use the device for botnet activities.
Likely Case
Remote code execution leading to data theft, device takeover for cryptocurrency mining or DDoS participation, and potential lateral movement to other network devices.
If Mitigated
Limited impact if device is behind strict firewall rules, not internet-facing, and network segmentation prevents lateral movement.
🎯 Exploit Status
Multiple public exploit scripts exist, including on Exploit-DB. The vulnerability is straightforward to exploit with simple HTTP POST requests containing command injection payloads.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: None
Vendor Advisory: https://www.dlink.com/al/sq/products/dns-343-sharecenter-4-bay-network-storage-enclosure
Restart Required: No
Instructions:
No official patch exists due to end-of-life status. The only secure solution is to replace the device with a supported model.
🔧 Temporary Workarounds
Block Web Interface Access
linuxConfigure firewall rules to block all external and internal access to the device's web interface (typically port 80/443).
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
Disable Mail Test Functionality
allIf possible, disable or remove the Mail Test functionality via device configuration.
🧯 If You Can't Patch
- Immediately disconnect device from internet and place behind strict firewall with no inbound access
- Replace device with supported hardware as soon as possible due to end-of-life status
🔍 How to Verify
Check if Vulnerable:
Check firmware version via web interface at http://device-ip/ or using curl: curl -s http://device-ip/ | grep -i firmwareCheck Version:
curl -s http://device-ip/ | grep -o 'Firmware Version:[^<]*'Verify Fix Applied:
Test if Mail Test endpoint responds to crafted payloads (not recommended on production systems). Monitor for successful firewall rule implementation.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/Mail_Test endpoint
- Shell command execution in system logs
- Failed authentication attempts followed by successful Mail Test requests
Network Indicators:
- HTTP POST requests to /goform/Mail_Test with shell metacharacters in parameters
- Outbound connections from device to unusual IPs/ports
SIEM Query:
source="device-logs" AND (url="/goform/Mail_Test" OR (process="sh" OR process="bash") AND parent_process="httpd")🔗 References
- https://github.com/jamesbercegay/advisories/blob/master/%5BGTSA-00128%5D%20D-Link%20DNS-343%20ShareCenter%201.05%20Remote%20Root.txt
- https://qkl.seebug.org/vuldb/ssvid-97088
- https://www.dlink.com/al/sq/products/dns-343-sharecenter-4-bay-network-storage-enclosure
- https://www.exploit-db.com/exploits/43845
- https://www.vulncheck.com/advisories/dlink-dns343-sharecenter-command-injection-via-goform-mail-test
