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U Series ApplianceApplication · Beyondtrust

CVE-2024-4017

HIGH · 7.8 CVSS v3.1 Published 2024-04-19
Fix available
A fix is available. Upgrade to 4.0.3 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
Improper Privilege Management vulnerability in BeyondTrust U-Series Appliance on Windows, 64 bit (filesystem modules) allows DLL Side-Loading.This issue affects U-Series Appliance: from 3.4 before 4.0.3.

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 · moderate confidence

Improper Privilege Management vulnerability in BeyondTrust U-Series Appliance (Windows 64-bit) filesystem modules versions 3.4 through before 4.0.3 allows DLL Side-Loading, where a malicious DLL can be loaded in place of a legitimate one due to insecure privilege handling during filesystem operations.

MitigationUpgrade BeyondTrust U-Series Appliance to version 4.0.3 or later to remediate the improper privilege management vulnerability enabling DLL side-loading.

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
U Series ApplianceApplication
Affected:>= 3.4, < 4.0.3

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. Verify BeyondTrust U-Series Appliance installation
    Locate the BeyondTrust U-Series Appliance installation directory or check installed programs on the Windows system. Common paths include C:\Program Files\BeyondTrust\ or check the Windows registry under HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall for BeyondTrust entries.
    Affected if The BeyondTrust U-Series Appliance is not installed on the system.
  2. Determine installed version
    Check the version of the BeyondTrust U-Series Appliance by examining the application executable, DLL version info, or appliance management interface. Look for version information in the program's main executable or in the About section of the application.
    Affected if The installed version is 3.4 or higher but lower than 4.0.3.
  3. Confirm Windows 64-bit architecture
    Verify the affected system is running the Windows 64-bit version of the appliance. Check system information (msinfo32) or the architecture of the installed executable files.
    Affected if The appliance is running on Windows 64-bit and the version falls within the vulnerable range.
  4. Check if filesystem modules are enabled
    Examine the BeyondTrust appliance configuration or management interface for filesystem module settings. Look for configuration files or settings that control filesystem operations and DLL loading behavior.
    Affected if Filesystem modules are enabled and the version is within the vulnerable range.
  5. Inspect DLL loading behavior
    Monitor or inspect the application's DLL loading process during filesystem operations. Check for any custom or third-party DLLs in the application directories that could be intercepted or replaced.
    Affected if The application loads DLLs from locations where an unprivileged user could place a malicious DLL, and the version is vulnerable.

The environment is affected if BeyondTrust U-Series Appliance version 3.4 through 4.0.2 (Windows 64-bit) is installed with filesystem modules enabled, allowing privilege-escalated DLL side-loading during filesystem operations.

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 4.0.3 or later
Fixed in 4.0.3
Interim mitigation

Upgrade BeyondTrust U-Series Appliance to version 4.0.3 or later to remediate the improper privilege management vulnerability enabling DLL side-loading.

Recommended fix High confidence

U-Series Appliance 4.0.3 or later

  1. Ensure you have a current backup of the U-Series Appliance configuration and data
  2. Download the BeyondTrust U-Series Appliance version 4.0.3 or later from the BeyondTrust support portal
  3. Follow BeyondTrust's standard upgrade procedure for U-Series Appliance, typically via the administrative web interface or provided upgrade tooling
  4. After upgrade, verify the Appliance version is 4.0.3 or higher and confirm normal functionality

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

Fix this in U Series Appliance Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing12.0 h
  • Review / QA4.0 h
28.0 hours of engineering $4,760
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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-2024-4017 in production — separate from our analysis above.

No notes yet

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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