CVE-2021-46233
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary commands on D-Link DI-7200GV2.E1 routers via command injection in the msp_info.htm function. Attackers can exploit this by sending specially crafted requests with malicious commands in the cmd parameter. Only users of the specific D-Link router model and firmware version are affected.
💻 Affected Systems
- D-Link DI-7200GV2.E1
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise allowing attackers to install malware, pivot to internal networks, steal credentials, or render the device inoperable.
Likely Case
Attackers gain remote shell access to execute commands, potentially leading to network reconnaissance, data exfiltration, or using the device as a botnet node.
If Mitigated
If network segmentation and access controls are implemented, impact is limited to the isolated router with no lateral movement.
🎯 Exploit Status
Exploitation requires sending HTTP requests to the vulnerable endpoint with command injection payloads. Public proof-of-concept code exists in GitHub repositories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for latest patched version
Vendor Advisory: https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10284
Restart Required: Yes
Instructions:
1. Access D-Link support portal. 2. Download latest firmware for DI-7200GV2.E1. 3. Log into router admin interface. 4. Navigate to firmware update section. 5. Upload and apply new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Network Segmentation
allIsolate router from critical internal networks to limit potential lateral movement
Access Control Lists
linuxRestrict access to router management interface to trusted IP addresses only
iptables -A INPUT -p tcp --dport 80 -s trusted_ip -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
🧯 If You Can't Patch
- Disable remote management interface if not required
- Implement network monitoring for suspicious traffic to/from router
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface. If version is v21.04.09E1, device is vulnerable.Check Version:
curl -s http://router-ip/status.html | grep -i firmwareVerify Fix Applied:
After patching, verify firmware version has changed from v21.04.09E1 to newer version in admin interface.📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in router logs
- Multiple failed login attempts followed by successful access
- HTTP requests to msp_info.htm with suspicious cmd parameters
Network Indicators:
- Unusual outbound connections from router
- Traffic to known malicious IPs
- Unexpected SSH/Telnet sessions originating from router
SIEM Query:
source="router_logs" AND (uri="/msp_info.htm" OR cmd="*;*" OR cmd="*|*")🔗 References
- https://github.com/pjqwudi/my_vuln/blob/main/D-link/vuln_12/12.md
- https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10284
- https://www.dlink.com/en/security-bulletin/
- https://github.com/pjqwudi/my_vuln/blob/main/D-link/vuln_12/12.md
- https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10284
- https://www.dlink.com/en/security-bulletin/
