CVE-2019-13194
📋 TL;DR
Brother printers expose sensitive information through specific URLs accessible without authentication. Attackers can retrieve configuration details, network settings, and potentially credentials by visiting crafted web addresses. This affects Brother printer models like HL-L8360CDW with vulnerable firmware versions.
💻 Affected Systems
- Brother HL-L8360CDW
- Other Brother printer models with similar firmware
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers obtain administrative credentials, network configurations, and sensitive printer data, enabling further network compromise or printer takeover.
Likely Case
Unauthenticated users access printer configuration pages revealing network settings, device information, and potentially weak credentials.
If Mitigated
With proper network segmentation and access controls, impact is limited to printer information disclosure without broader network access.
🎯 Exploit Status
Exploitation requires only web browser access to specific printer URLs. No authentication needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firmware v1.21 or later
Vendor Advisory: https://support.brother.com/g/b/faqend.aspx?c=us&lang=en&prod=group2&faqid=faq00100670_000
Restart Required: Yes
Instructions:
1. Download latest firmware from Brother support site. 2. Access printer web interface. 3. Navigate to firmware update section. 4. Upload and install new firmware. 5. Reboot printer.
🔧 Temporary Workarounds
Network Segmentation
allIsolate printers on separate VLAN without internet access
Access Control Lists
allRestrict access to printer management interface to authorized IPs only
🧯 If You Can't Patch
- Disable printer web interface if not required
- Change default credentials and implement strong authentication
🔍 How to Verify
Check if Vulnerable:
Access printer IP address in browser and check if sensitive information pages are accessible without authenticationCheck Version:
Check printer web interface status page or use SNMP query: snmpwalk -v2c -c public printer_ip 1.3.6.1.2.1.25.6.3.1.2Verify Fix Applied:
Verify firmware version is v1.21 or later and test that previously accessible information disclosure URLs now require authentication📡 Detection & Monitoring
Log Indicators:
- Unusual access to printer web interface from unauthorized IPs
- Multiple failed authentication attempts followed by information disclosure requests
Network Indicators:
- HTTP GET requests to printer IP with specific paths like /etc/mnt_info.csv
- Unusual traffic patterns to printer management ports
SIEM Query:
source="printer_logs" AND (url="*mnt_info*" OR url="*config*" OR url="*password*") AND user="-"🔗 References
- https://global.brother
- https://support.brother.com/g/b/faqend.aspx?c=us&lang=en&prod=group2&faqid=faq00100670_000
- https://www.nccgroup.trust/us/our-research/technical-advisory-multiple-vulnerabilities-in-brother-printers/
- https://global.brother
- https://support.brother.com/g/b/faqend.aspx?c=us&lang=en&prod=group2&faqid=faq00100670_000
- https://www.nccgroup.trust/us/our-research/technical-advisory-multiple-vulnerabilities-in-brother-printers/
