CVE-2024-42420
📋 TL;DR
Sharp and Toshiba Tec multifunction printers (MFPs) contain out-of-bounds read vulnerabilities in their web interfaces. Attackers can crash affected devices by sending specially crafted HTTP requests containing malicious keyword search inputs or SOAP messages. Organizations using vulnerable Sharp and Toshiba Tec MFP models are affected.
💻 Affected Systems
- Sharp MFPs
- Toshiba Tec MFPs
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device crash requiring physical reboot, causing service disruption and potential data loss during printing/scanning operations.
Likely Case
Temporary denial of service affecting printing/scanning capabilities until device is manually rebooted.
If Mitigated
Minimal impact if devices are isolated from untrusted networks and patched promptly.
🎯 Exploit Status
Exploitation requires sending crafted HTTP requests to device web interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firmware updates specified in vendor advisories
Vendor Advisory: https://global.sharp/products/copier/info/info_security_2024-10.html
Restart Required: Yes
Instructions:
1. Check vendor advisories for affected models. 2. Download firmware updates from vendor support portals. 3. Apply firmware updates following vendor instructions. 4. Reboot devices after update completion.
🔧 Temporary Workarounds
Network segmentation
allIsolate MFPs from untrusted networks and restrict access to management interfaces
Access control
allImplement firewall rules to restrict HTTP access to MFP management interfaces
🧯 If You Can't Patch
- Segment MFPs on isolated VLANs with strict access controls
- Disable unnecessary web interface features if supported
🔍 How to Verify
Check if Vulnerable:
Check device firmware version against vendor advisory listsCheck Version:
Check via device web interface or vendor management toolsVerify Fix Applied:
Verify firmware version matches patched versions in vendor advisories📡 Detection & Monitoring
Log Indicators:
- Multiple HTTP requests with malformed parameters to MFP web interface
- Device reboot logs following web interface access
Network Indicators:
- HTTP requests with unusual keyword search parameters
- Malformed SOAP messages to MFP endpoints
SIEM Query:
source_ip=MFP_IP AND (http_uri CONTAINS 'search' OR http_content CONTAINS 'SOAP') AND http_status=500