CVE-2018-12048
📋 TL;DR
This vulnerability allows remote attackers to bypass authentication on Canon LBP7110Cw printer web interfaces by accessing /portal_top.html without a PIN, granting full administrative access. It affects devices with default settings where security best practices haven't been implemented. Attackers can completely compromise the device remotely.
💻 Affected Systems
- Canon LBP7110Cw printer
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device takeover allowing configuration changes, firmware manipulation, data exfiltration, and potential use as an internal network pivot point.
Likely Case
Unauthorized access to printer management functions, configuration changes, and potential data exposure from print jobs.
If Mitigated
No impact if proper security controls like changing default settings and implementing recommended practices are followed.
🎯 Exploit Status
Simple HTTP request sequence documented in public exploits; no special tools required.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: N/A
Vendor Advisory: N/A
Restart Required: No
Instructions:
No official patch available. Follow vendor's recommended security practices from documentation.
🔧 Temporary Workarounds
Change Default Settings
allImplement security countermeasures and best practices from Canon documentation
N/A - Configuration changes via web interface
Network Segmentation
allIsolate printer to restricted network segment with limited access
N/A - Network configuration
🧯 If You Can't Patch
- Disable web interface if not required for operations
- Implement strict network access controls and firewall rules to limit access to printer management interface
🔍 How to Verify
Check if Vulnerable:
Attempt to access /portal_top.html on printer web interface without authentication; if management access is granted, device is vulnerable.Check Version:
Check printer firmware version via web interface or physical displayVerify Fix Applied:
Verify authentication is required for all management functions and default settings have been changed per vendor recommendations.📡 Detection & Monitoring
Log Indicators:
- Unauthorized access to /portal_top.html or /checkLogin.cgi
- Authentication bypass attempts
- Administrative actions from unexpected IP addresses
Network Indicators:
- HTTP requests to printer management interface from unauthorized sources
- Unusual administrative traffic patterns
SIEM Query:
source_ip=* destination_ip=printer_ip (uri_path="/portal_top.html" OR uri_path="/checkLogin.cgi") AND http_response_code=200