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Fabric Operating SystemOperating system · Broadcom

CVE-2023-31427

HIGH · 7.8 CVSS v3.1 Published 2023-08-01
Fix available
A fix is available. Upgrade to 9.1.1c or later.
See remediation →
80/100
Remediation priority · High
Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Brocade Fabric OS versions before Brocade Fabric OS v9.1.1c, and v9.2.0 Could allow an authenticated, local user with knowledge of full path names inside Brocade Fabric OS to execute any command regardless of assigned privilege. Starting with Fabric OS v9.1.0, “root” account access is disabled.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

Brocade Fabric OS contains a local privilege escalation vulnerability where an authenticated local user with knowledge of full path names can execute arbitrary commands regardless of their assigned privilege level, effectively bypassing permission controls.

MitigationUpgrade to Brocade Fabric OS v9.1.1c, v9.2.0, or later to remediate this vulnerability. Additionally, limit local access to trusted personnel and monitor for unauthorized access.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Fabric Operating SystemOperating system
Affected:< 9.1.1c

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Check Fabric OS version
    Run 'version' or 'firmwareShow' command on the Fabric OS CLI to retrieve the installed firmware version
    Affected if The displayed version is less than 9.1.1c (for example, 9.1.0, 9.0.x, 8.x, etc.)
  2. Verify local authentication is enabled
    Check if local user accounts exist by running 'userconfigshow' or 'userlist' command to see locally defined users
    Affected if Local user accounts are configured on the system
  3. Confirm privilege assignment for local users
    Run 'userconfigshow' or check individual user privileges with 'userconfig --show <username>' to see each user's assigned role
    Affected if Any local user has a privilege level lower than admin yet the system allows command execution beyond their assigned permissions
  4. Check for command execution paths
    Review system logs or audit trails for unusual command executions from non-admin local users using full paths
    Affected if Evidence exists of local users executing commands outside their assigned privilege scope

A system is affected if it runs Fabric OS versions below 9.1.1c and has local user accounts configured, allowing authenticated users to potentially bypass privilege controls.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 9.1.1c or later
Fixed in 9.1.1c
Interim mitigation

Upgrade to Brocade Fabric OS v9.1.1c, v9.2.0, or later to remediate this vulnerability. Additionally, limit local access to trusted personnel and monitor for unauthorized access.

Recommended fix High confidence

Brocade Fabric OS v9.1.1c or later (v9.2.1 recommended as v9.2.0 is also affected)

  1. Identify current Fabric OS version using 'version' command or via management interface
  2. Schedule a maintenance window for the upgrade
  3. Back up current Fabric OS configuration using 'configupload' command
  4. Obtain the fixed Fabric OS firmware (v9.1.1c or later) from Broadcom support portal
  5. Upgrade Fabric OS using 'firmwaredownload' command or via management interface
  6. Verify successful upgrade by checking new version with 'version' command
  7. Confirm the path traversal vulnerability is remediated by verifying command execution is properly restricted
Caveat Note: Starting with Fabric OS v9.1.0, root account access is disabled; ensure administrative procedures account for this change

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Fabric Operating System Scoped from the published advisory
  • Consultation6.0 h
  • Implementation12.0 h
  • Testing6.0 h
  • Review / QA3.0 h
27.0 hours of engineering $4,800
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Scan for this in your stack

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2023-31427 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data