CVE-2013-3093
📋 TL;DR
CVE-2013-3093 is a Cross-Site Request Forgery (CSRF) vulnerability in ASUS RT-N56U wireless routers that allows attackers to trick authenticated users into performing unauthorized actions on the router's web interface. This affects all users of ASUS RT-N56U routers with default or custom web interface configurations. Attackers can exploit this when users visit malicious websites while logged into their router's admin panel.
💻 Affected Systems
- ASUS RT-N56U Wireless Router
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete router compromise allowing attacker to change DNS settings, modify firewall rules, capture network traffic, change admin credentials, or enable remote administration, potentially leading to full network compromise.
Likely Case
Router configuration changes such as DNS hijacking to redirect traffic to malicious sites, enabling remote access for attackers, or disabling security features.
If Mitigated
Limited impact if users don't visit malicious sites while logged into router admin, or if additional CSRF protections are implemented.
🎯 Exploit Status
Exploitation requires user to be logged into router admin interface and visit malicious website. CSRF attacks are well-understood and easy to implement.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firmware version 3.0.0.4.374_979 or later
Vendor Advisory: https://www.asus.com/support/FAQ/1034974/
Restart Required: Yes
Instructions:
1. Log into router admin interface. 2. Navigate to Administration > Firmware Upgrade. 3. Download latest firmware from ASUS support site. 4. Upload and install firmware. 5. Router will reboot automatically.
🔧 Temporary Workarounds
Log out after router administration
allAlways log out of router admin interface after making changes to prevent CSRF attacks.
Use separate browser for admin tasks
allUse a dedicated browser or incognito/private mode only for router administration to prevent session persistence.
🧯 If You Can't Patch
- Disable remote administration and only access router from trusted internal network
- Implement network segmentation to isolate router management interface
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router admin interface under Administration > Firmware Upgrade. If version is older than 3.0.0.4.374_979, device is vulnerable.Check Version:
Login to router web interface and check firmware version in Administration sectionVerify Fix Applied:
Verify firmware version shows 3.0.0.4.374_979 or newer after update. Test CSRF protection by attempting to submit forms without proper tokens.📡 Detection & Monitoring
Log Indicators:
- Multiple configuration changes from same IP in short timeframe
- Unauthorized DNS or firewall rule modifications
Network Indicators:
- Unexpected DNS server changes
- New remote administration ports opened
SIEM Query:
source="router_logs" AND (event="configuration_change" OR event="admin_action") | stats count by src_ip, user, action | where count > threshold