CVE-2021-46229
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary commands on D-Link DI-7200GV2.E1 routers via command injection in the usb_paswd.asp function. Attackers can exploit this by manipulating the name parameter to run malicious commands. Organizations using affected D-Link router models are at risk.
💻 Affected Systems
- D-Link DI-7200GV2.E1
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attackers to install persistent backdoors, pivot to internal networks, intercept traffic, or use the device for botnet activities.
Likely Case
Attackers gain shell access to execute commands, potentially stealing credentials, modifying configurations, or disrupting network services.
If Mitigated
Limited impact if device is behind firewalls with strict inbound filtering and network segmentation prevents lateral movement.
🎯 Exploit Status
Exploit details are publicly available in GitHub repositories, making this easily weaponizable by attackers.
🛠️ 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 site. 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 device.
🔧 Temporary Workarounds
Disable USB functions
allIf USB features are not needed, disable them to remove attack surface.
Network segmentation
allIsolate affected routers in separate VLANs with strict firewall rules.
🧯 If You Can't Patch
- Block external access to router management interface using firewall rules.
- Implement network monitoring for unusual outbound connections from the router.
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via admin interface; if version is v21.04.09E1 or potentially earlier, device is vulnerable.Check Version:
Log into router web interface and navigate to System Status or similar section to view firmware version.Verify Fix Applied:
After patching, verify firmware version has changed from v21.04.09E1 to a newer version.📡 Detection & Monitoring
Log Indicators:
- Unusual commands in system logs
- Multiple failed login attempts to usb_paswd.asp
- Unexpected process execution
Network Indicators:
- Unusual outbound connections from router
- Traffic to known malicious IPs
SIEM Query:
source="router_logs" AND ("usb_paswd.asp" OR "command injection")🔗 References
- https://github.com/pjqwudi/my_vuln/blob/main/D-link/vuln_11/11.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_11/11.md
- https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10284
- https://www.dlink.com/en/security-bulletin/
