CVE-2015-7246
📋 TL;DR
This CVE describes a critical vulnerability in D-Link DVG-N5402SP routers where default credentials (root:root, tw:tw) allow remote attackers to gain administrative access. Affected systems include D-Link DVG-N5402SP routers with specific firmware versions, making them vulnerable to complete compromise.
💻 Affected Systems
- D-Link DVG-N5402SP
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device takeover leading to network compromise, data exfiltration, and use as pivot point for further attacks
Likely Case
Unauthorized administrative access allowing configuration changes, traffic interception, and device control
If Mitigated
Limited impact if strong authentication controls and network segmentation are implemented
🎯 Exploit Status
Simple credential-based attack requiring no special skills; exploit code is publicly available
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified by vendor
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch available. Users must implement workarounds and mitigation strategies.
🔧 Temporary Workarounds
Change Default Credentials
allImmediately change default passwords for root and tw accounts to strong, unique passwords
Login to router admin interface > System > Password Management > Change passwords
Disable Remote Administration
allTurn off remote management features to prevent external access
Login to router admin interface > Management > Remote Management > Disable
🧯 If You Can't Patch
- Isolate affected devices in separate VLAN with strict firewall rules
- Implement network monitoring for authentication attempts and block repeated failed logins
🔍 How to Verify
Check if Vulnerable:
Attempt to login to router admin interface using default credentials root:root or tw:twCheck Version:
Login to router admin interface > System > Firmware InformationVerify Fix Applied:
Verify you cannot login with default credentials and new strong passwords are required📡 Detection & Monitoring
Log Indicators:
- Failed login attempts followed by successful login with default credentials
- Authentication logs showing root or tw account access
Network Indicators:
- HTTP/HTTPS traffic to router admin interface from unexpected sources
- Configuration changes without authorized user activity
SIEM Query:
source="router_logs" AND (user="root" OR user="tw") AND action="login_success"🔗 References
- http://packetstormsecurity.com/files/135590/D-Link-DVG-N5402SP-Path-Traversal-Information-Disclosure.html
- http://seclists.org/fulldisclosure/2016/Feb/24
- https://www.exploit-db.com/exploits/39409/
- http://packetstormsecurity.com/files/135590/D-Link-DVG-N5402SP-Path-Traversal-Information-Disclosure.html
- http://seclists.org/fulldisclosure/2016/Feb/24
- https://www.exploit-db.com/exploits/39409/
