CVE-2017-3191
📋 TL;DR
D-Link DIR-130 and DIR-330 routers with vulnerable firmware versions allow remote attackers to bypass authentication on the remote management login page. By manipulating POST requests, attackers can access administrator-only pages without credentials. This affects organizations and individuals using these specific router models with the vulnerable firmware.
💻 Affected Systems
- D-Link DIR-130
- D-Link DIR-330
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of router administration allowing attacker to reconfigure network settings, intercept traffic, install malicious firmware, or use router as pivot point into internal network.
Likely Case
Unauthorized access to router administration panel leading to network configuration changes, DNS hijacking, or credential theft.
If Mitigated
Limited impact if remote management is disabled or proper network segmentation isolates the router.
🎯 Exploit Status
Exploitation involves simple HTTP POST request manipulation. Public proof-of-concept code and technical details are available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: DIR-130 firmware 1.23B01 or later, DIR-330 firmware 1.13 or later
Vendor Advisory: https://support.dlink.com/security/
Restart Required: Yes
Instructions:
1. Download latest firmware from D-Link support site. 2. Log into router admin panel. 3. Navigate to Tools > Firmware. 4. Upload and install new firmware. 5. Router will reboot automatically.
🔧 Temporary Workarounds
Disable Remote Management
allTurn off remote administration feature to prevent external access to vulnerable interface.
Login to router admin > Tools > Admin > Remote Management > Disable
Restrict Access with Firewall Rules
linuxBlock external access to router management ports (typically 8080, 443, 80).
iptables -A INPUT -p tcp --dport 8080 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
iptables -A INPUT -p tcp --dport 80 -j DROP
🧯 If You Can't Patch
- Replace affected routers with newer models or different vendors
- Place routers behind dedicated firewall with strict inbound rules blocking management ports
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin panel under Status > Firmware. If DIR-130 shows 1.23 or DIR-330 shows 1.12, you are vulnerable.Check Version:
curl -k https://router-ip/status.cgi | grep firmwareVerify Fix Applied:
After patching, verify firmware version shows DIR-130 1.23B01+ or DIR-330 1.13+. Test remote login page with invalid credentials to confirm authentication is required.📡 Detection & Monitoring
Log Indicators:
- Failed authentication attempts followed by successful access to admin pages
- POST requests to tools_admin.asp without preceding successful login
Network Indicators:
- HTTP POST requests to router IP on port 8080/443 with manipulated parameters
- Unauthorized access to admin pages from external IPs
SIEM Query:
source="router-logs" (url="*/tools_admin.asp" OR url="*/admin/*") AND NOT (user="admin" AND auth="success")🔗 References
- https://exchange.xforce.ibmcloud.com/vulnerabilities/123293
- https://www.kb.cert.org/vuls/id/553503
- https://www.scmagazine.com/d-link-dir-130-and-dir-330-routers-vulnerable/article/644553/
- https://www.wilderssecurity.com/threads/d-link-dir-130-and-dir-330-are-vulnerable-to-authentication-bypass-and-do-not-protect-credentials.392703/
- https://exchange.xforce.ibmcloud.com/vulnerabilities/123293
- https://www.kb.cert.org/vuls/id/553503
- https://www.scmagazine.com/d-link-dir-130-and-dir-330-routers-vulnerable/article/644553/
- https://www.wilderssecurity.com/threads/d-link-dir-130-and-dir-330-are-vulnerable-to-authentication-bypass-and-do-not-protect-credentials.392703/
