CVE-2022-48255
📋 TL;DR
This is a critical command injection vulnerability in Huawei BiSheng-WNM firmware that allows attackers to execute arbitrary system commands on affected printers. Successful exploitation leads to remote code execution with high privileges. Organizations using Huawei printers with the vulnerable firmware are affected.
💻 Affected Systems
- Huawei printers with BiSheng-WNM firmware
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise allowing attacker to install persistent malware, exfiltrate sensitive data, pivot to internal networks, or use printer as part of botnet.
Likely Case
Printer compromise leading to data theft, denial of service, or use as internal network foothold for lateral movement.
If Mitigated
Limited impact if printers are isolated on separate network segments with strict firewall rules and no internet access.
🎯 Exploit Status
Command injection vulnerabilities typically have low exploitation complexity once the injection point is identified.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in advisory - contact Huawei for patched version
Vendor Advisory: https://www.huawei.com/en/psirt/security-advisories/2023/huawei-sa-sciviahpp-f18e962a-en
Restart Required: Yes
Instructions:
1. Contact Huawei support for patched firmware version
2. Download firmware update from Huawei portal
3. Apply firmware update through printer management interface
4. Reboot printer to activate new firmware
🔧 Temporary Workarounds
Network Segmentation
allIsolate printers on separate VLAN with strict firewall rules
Access Control
allRestrict printer management interface access to authorized IPs only
🧯 If You Can't Patch
- Disable remote management features if not required
- Implement strict network access controls to limit printer exposure
🔍 How to Verify
Check if Vulnerable:
Check firmware version in printer web interface or management consoleCheck Version:
Check printer web interface at http://[printer-ip]/ or use SNMP queryVerify Fix Applied:
Verify firmware version has been updated to patched version📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in printer logs
- Multiple failed authentication attempts
- Unexpected firmware modification attempts
Network Indicators:
- Unusual outbound connections from printer
- Suspicious traffic to printer management ports
- Command injection patterns in HTTP requests
SIEM Query:
source="printer_logs" AND (command="*;*" OR command="*|*" OR command="*`*" OR command="*$(*")