CVE intelligence and bounded remediation

CVE-2022-36557 — Seiko-Sol Skybridge Mb-A100 Firmware security vulnerability

Critical CVSS 9.8

Seiko SkyBridge MB-A100/A110 v4.2.0 and below was discovered to contain an arbitrary file upload vulnerability via the restore backup function. This vulnerability allows attackers to execute arbitrary code via a crafted html file.

Severity
Critical
CVSS
9.8 (3.1)
Published
2022-08-29
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-434

Affected products

  • seiko-sol / skybridge_mb-a100_firmware
  • seiko-sol / skybridge_mb-a110_firmware

Matched remediation archetype

Path traversal, unsafe upload, and file handling

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Check exposure

  • Trace untrusted filenames, archive entries, URLs, and path segments into read, write, include, extraction, and upload operations.
  • Identify filesystem roots, mount permissions, symbolic-link behavior, archive handling, and whether uploaded content is web-accessible or executable.
  • Review canonicalization and containment checks across supported operating systems and storage backends.

Remediate safely

  • Generate server-side storage identifiers and resolve paths beneath a fixed root using filesystem-aware containment checks.
  • Reject absolute, parent-relative, alternate-separator, device, link, and archive entries that escape the intended root.
  • Store uploads outside executable or served paths, validate type and size, and use private atomic temporary files.

Authoritative sources

Complete CVE record and remediation plan

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