Ensure printer firmware is current and only signed firmware can be installed

高级别 1人工审核printer

说明

Printer firmware regularly receives fixes for remotely exploitable flaws (PJL/PostScript, IPP, EWS). Accepting unsigned firmware allows persistent implants.

检查方式

审计方法: 人工审核

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In the Embedded Web Server (EWS: browse to https://<printer-ip>/ and sign in as administrator; HP: Security / Networking tabs, Xerox: Properties > Security / Connectivity, Ricoh: Device Management > Configuration, Canon: Settings/Registration > Network Settings / Security Settings): read the firmware version (HP: Information > Configuration Page / Firmware Upgrade; Xerox: Properties > General Setup > Configuration Report) and compare it with the latest release and security bulletins on the vendor support site. Confirm firmware signature verification / whitelisting is on (e.g. HP Code Signing / Sure Start, Xerox firmware verification, 'Allow firmware upgrade via PJL/print job' disabled) and that remote firmware upgrade is restricted to administrators.

修复方式

修复方法: 操作指南或基础设施补丁

Download the current firmware from the vendor support portal, verify its checksum/signature, and install via EWS (Firmware Upgrade) or fleet tooling during a maintenance window. Disable firmware upgrade via print jobs (PJL/port 9100) and enable signed-firmware enforcement.

属性

操作系统: 任意
标签: printerfirmwarepatching
参考: CIS Multi-Function Device Benchmark v1.0.0 - Firmware updates / firmware integrity (verify section number for your release)