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CVE-2024-58388 – Unauthenticated Local File Inclusion / Path Traversal – Sharp and Toshiba Tec Multi

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Summary

CVE-2024-58388 is an unauthenticated local file inclusion (path traversal) vulnerability affecting the web management interface of Sharp Corporation and Toshiba Tec Corporation multifunction printers (MFPs). The flaw lets a remote, unauthenticated attacker read arbitrary files from the device’s filesystem, including system files and stored credentials. It carries a CVSS v3.1 base score of 7.5 (High) and a CVSS v4.0 base score of 8.7 (High), and has reportedly been observed exploited in the wild.

Technical details

  • Root cause: the installed_emanual_down.html endpoint on the printer’s web interface accepts a path request parameter that is used to build a filesystem path without adequate sanitization.
  • Trigger: an attacker submits a request such as path=/manual/../../../<target-file>, using ../ directory traversal sequences to escape the intended manual directory and reference arbitrary files on the device.
  • Attack vector: network-based, no authentication or user interaction required — the endpoint is reachable from the printer’s exposed web management interface.
  • Impact: disclosure of sensitive files, including /etc/passwd, device configuration, and coredump files that may contain clear-text credentials and encryption keys. Leaked credentials can be chained with other flaws (e.g., device crash/DoS issues that generate coredumps) to escalate toward further compromise of the device or connected systems.

Affected software

  • Sharp Corporation: multiple multifunction printer (MFP) models running affected firmware versions of the embedded web interface.
  • Toshiba Tec Corporation: multiple multifunction printer (rebranded/OEM) models running affected firmware versions of the embedded web interface.
  • Sharp’s own 2024 advisory lists dozens of specific MX-series, BP-series, and DX-series models with fixed firmware available, as well as legacy models for which firmware support has ended.

Severity

  • CVSS v3.1 Base Score: 7.5 (High) — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
  • CVSS v4.0 Base Score: 8.7 (High) — CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Mitigation and recommended actions

  • Immediate: apply the firmware updates listed in Sharp’s security advisory for affected models; confirm with the vendor whether your specific model/firmware version is covered.
  • If no patch is available (legacy/end-of-support models): discontinue internet exposure of the device’s web management interface, restrict access via firewall to trusted management networks only, enable password protection on the device web page, and change any default administrator credentials.
  • General: never expose printer/MFP web management interfaces directly to the internet; place them behind network segmentation and VPN/firewall controls, and monitor for anomalous requests to manual/help-download endpoints.

References

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