CVE-2024-47939
📋 TL;DR
A stack-based buffer overflow vulnerability in Ricoh Web Image Monitor allows attackers to execute arbitrary code or cause denial-of-service by sending specially crafted requests. This affects multiple Ricoh and Konica Minolta laser printers and MFPs with vulnerable firmware versions. Organizations using these devices are at risk of compromise.
💻 Affected Systems
- Ricoh laser printers and MFPs
- Konica Minolta laser printers and MFPs
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, lateral movement to internal networks, and persistent backdoor installation.
Likely Case
Denial-of-service causing printer/MFP downtime and disruption of printing services.
If Mitigated
Limited impact if devices are isolated from untrusted networks and have network filtering in place.
🎯 Exploit Status
Buffer overflow vulnerabilities in network services are often easily weaponized once details become public.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firmware updates specified in vendor advisories
Vendor Advisory: https://jp.ricoh.com/security/products/vulnerabilities/vul?id=ricoh-2024-000011
Restart Required: Yes
Instructions:
1. Identify affected printer/MFP models. 2. Check vendor advisory for specific firmware updates. 3. Download firmware from vendor support portal. 4. Apply firmware update following vendor instructions. 5. Verify update completion and restart device.
🔧 Temporary Workarounds
Disable Web Image Monitor
allTurn off the vulnerable Web Image Monitor service if not required for operations.
Access printer web interface > Configuration > Network > Services > Disable Web Image Monitor
Network Segmentation
allIsolate printers/MFPs to separate VLAN with restricted access.
🧯 If You Can't Patch
- Implement strict network access controls to limit access to printer management interfaces
- Monitor network traffic to printer/MFP devices for suspicious activity
🔍 How to Verify
Check if Vulnerable:
Check device firmware version against vendor advisory lists. Access printer web interface and navigate to System Settings > Device Information.Check Version:
Access printer web interface at http://[printer-ip]/ or check device control panel for firmware version.Verify Fix Applied:
Verify firmware version matches patched version from vendor advisory. Test Web Image Monitor functionality if service remains enabled.📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP requests to Web Image Monitor endpoints
- Device crash/restart logs
- Buffer overflow error messages in device logs
Network Indicators:
- Unusual HTTP POST/GET requests to printer management interfaces
- Traffic patterns suggesting exploit attempts
SIEM Query:
source="printer_logs" AND ("Web Image Monitor" OR "buffer overflow" OR "crash")