CVE-2022-43969
📋 TL;DR
Ricoh mp_c4504ex multifunction printers with firmware 1.06 mishandle credentials, potentially allowing unauthorized access to device management functions. This affects organizations using these specific Ricoh devices with vulnerable firmware. Attackers could exploit this to gain administrative control over the printer.
💻 Affected Systems
- Ricoh mp_c4504ex
📦 What is this software?
Mp C2003 Smart Operation Panel Firmware by Ricoh
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Mp C2503 Smart Operation Panel Firmware by Ricoh
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Mp C3003 Smart Operation Panel Firmware by Ricoh
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Mp C3503 Smart Operation Panel Firmware by Ricoh
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Mp C4503 Smart Operation Panel Firmware by Ricoh
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Mp C5503 Smart Operation Panel Firmware by Ricoh
View all CVEs affecting Mp C5503 Smart Operation Panel Firmware →
⚠️ Risk & Real-World Impact
Worst Case
Full device compromise allowing attackers to intercept print jobs, modify device settings, install malicious firmware, or use the device as a network pivot point.
Likely Case
Unauthorized access to device management interface leading to configuration changes, print job interception, or credential harvesting.
If Mitigated
Limited impact if device is isolated from untrusted networks and access controls are properly configured.
🎯 Exploit Status
Credential mishandling typically involves authentication bypass or credential exposure, making exploitation straightforward once discovered.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firmware version 1.07 or later
Vendor Advisory: https://www.ricoh.com/products/security/vulnerabilities/vul?id=ricoh-2022-000002
Restart Required: Yes
Instructions:
1. Download firmware update from Ricoh support portal. 2. Upload firmware to device via web interface. 3. Apply update. 4. Reboot device.
🔧 Temporary Workarounds
Network isolation
allRestrict network access to printer management interface
Configure firewall rules to block external access to printer IP on management ports (typically 80, 443, 631)
Access control hardening
allImplement strict access controls and monitoring
Enable logging for all authentication attempts
Implement IP whitelisting for management interface
🧯 If You Can't Patch
- Isolate device on separate VLAN with strict firewall rules
- Disable remote management features if not required
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface: Settings > Device Information > Firmware VersionCheck Version:
Not applicable - check via device web interfaceVerify Fix Applied:
Confirm firmware version is 1.07 or higher in device information📡 Detection & Monitoring
Log Indicators:
- Failed authentication attempts from unexpected sources
- Configuration changes from unauthorized users
- Unusual access patterns to printer management interface
Network Indicators:
- Unexpected traffic to printer management ports from external IPs
- Brute force attempts against printer authentication
SIEM Query:
source_ip=printer_ip AND (port=80 OR port=443 OR port=631) AND (event_type=auth_failure OR event_type=config_change)