CVE-2015-6319
📋 TL;DR
This CVE describes a SQL injection vulnerability in the web-based management interface of Cisco RV220W wireless routers. Remote attackers can execute arbitrary SQL commands by sending specially crafted HTTP headers, potentially gaining unauthorized access to the device's database. Organizations using affected Cisco RV220W devices are at risk.
💻 Affected Systems
- Cisco RV220W Wireless-N VPN Firewall
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the router, allowing attackers to modify configurations, intercept network traffic, install persistent backdoors, and pivot to internal networks.
Likely Case
Unauthorized access to administrative functions, configuration changes, credential theft, and potential network disruption.
If Mitigated
Limited impact if the management interface is not exposed to untrusted networks and proper network segmentation is in place.
🎯 Exploit Status
SQL injection via HTTP headers is a well-understood attack vector with available exploit code in security communities.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firmware version 1.0.5.17 or later
Vendor Advisory: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160127-rv220
Restart Required: Yes
Instructions:
1. Download the latest firmware from Cisco's support site. 2. Log into the RV220W web interface. 3. Navigate to Administration > Firmware Upgrade. 4. Upload and install the new firmware. 5. Reboot the device after installation completes.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to the web management interface
Log into web interface > Firewall > Basic Settings > Disable 'Remote Management'
Restrict Management Access
allLimit management interface access to specific IP addresses
Log into web interface > Firewall > Access Rules > Create rule restricting port 443/tcp to trusted IPs
🧯 If You Can't Patch
- Isolate the RV220W device on a dedicated management VLAN with strict access controls
- Implement a network-based IPS/IDS to detect and block SQL injection attempts against the management interface
🔍 How to Verify
Check if Vulnerable:
Check current firmware version in web interface: Status > Router > Firmware Version. If version is earlier than 1.0.5.17, device is vulnerable.Check Version:
No CLI command available. Must check via web interface at Status > Router > Firmware Version.Verify Fix Applied:
Confirm firmware version shows 1.0.5.17 or later after upgrade. Test management interface functionality remains operational.📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP requests to management interface with SQL keywords in headers
- Multiple failed login attempts followed by successful access
- Configuration changes from unexpected IP addresses
Network Indicators:
- SQL injection patterns in HTTP headers to port 443/tcp
- Unusual outbound connections from the router after management interface access
SIEM Query:
source_ip="RV220W_IP" AND (http_header CONTAINS "UNION" OR http_header CONTAINS "SELECT" OR http_header CONTAINS "INSERT")