CVE-2024-39927
📋 TL;DR
This CVE describes an out-of-bounds write vulnerability in Ricoh MFPs and printers that allows remote attackers to send specially crafted requests. Exploitation can cause denial-of-service conditions or data destruction on affected devices. Organizations using vulnerable Ricoh printing equipment are at risk.
💻 Affected Systems
- Ricoh MFPs
- Ricoh printers
⚠️ 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 unauthenticated attacker could permanently destroy device data and render printers/MFPs completely inoperable, requiring hardware replacement.
Likely Case
Remote attacker causes temporary DoS by crashing device services, disrupting printing operations until manual reboot.
If Mitigated
With proper network segmentation and access controls, impact limited to isolated printing segment with no data exfiltration.
🎯 Exploit Status
Remote exploitation without authentication suggests relatively simple attack vectors via network protocols.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check specific firmware updates per device model in vendor advisory
Vendor Advisory: https://jp.ricoh.com/security/products/vulnerabilities/vul?id=ricoh-2024-000008
Restart Required: Yes
Instructions:
1. Identify affected Ricoh device models. 2. Visit Ricoh security advisory. 3. Download appropriate firmware updates. 4. Apply updates following Ricoh documentation. 5. Reboot devices.
🔧 Temporary Workarounds
Network segmentation
allIsolate printing devices on separate VLAN with strict firewall rules
Access control lists
allImplement IP-based restrictions to allow only authorized management stations
🧯 If You Can't Patch
- Segment printing network completely from production and internet
- Implement strict network monitoring for anomalous printing device traffic
🔍 How to Verify
Check if Vulnerable:
Check device firmware version against Ricoh advisory; devices with unpatched firmware are vulnerable.Check Version:
Check via Ricoh device web interface or embedded web server firmware information page.Verify Fix Applied:
Confirm firmware version matches or exceeds patched version listed in Ricoh advisory.📡 Detection & Monitoring
Log Indicators:
- Multiple failed connection attempts to printer management interfaces
- Unusual network traffic patterns to printer IPs
- Printer/MFP service crashes or reboots
Network Indicators:
- Malformed packets targeting printer management ports
- Unusual protocol traffic to printing devices
SIEM Query:
source_ip=* dest_ip=printer_subnet AND (protocol_anomaly OR multiple_failed_connections)🔗 References
- https://jp.ricoh.com/security/products/vulnerabilities/vul?id=ricoh-2024-000008
- https://jvn.jp/en/jp/JVN14294633/
- https://jvn.jp/jp/JVN14294633/
- https://www.ricoh.com/products/security/vulnerabilities/vul?id=ricoh-2024-000008
- https://jp.ricoh.com/security/products/vulnerabilities/vul?id=ricoh-2024-000008
- https://jvn.jp/en/jp/JVN14294633/
- https://jvn.jp/jp/JVN14294633/
- https://www.ricoh.com/products/security/vulnerabilities/vul?id=ricoh-2024-000008
