dbcve.org
Tcb ServisignApplication · Changingtec

CVE-2024-40720

HIGH · 8.8 CVSS v3.1 Published 2024-08-02
Fix available
A fix is available. Upgrade to 1.0.24.0318 or later.
See remediation →
95/100
Remediation priority · Urgent
Remotely reachable No privileges

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
The specific API in TCBServiSign Windows Version from CHANGING Information Technology does not properly validate server-side input. When a user visits a spoofed website, unauthenticated remote attackers can modify the `HKEY_CURRENT_USER` registry to execute arbitrary commands.

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

The TCBServiSign Windows Version application from CHANGING Information Technology contains an API that fails to properly validate server-side input. When a user visits a malicious or spoofed website, unauthenticated remote attackers can exploit this to modify HKEY_CURRENT_USER registry keys, leading to arbitrary command execution.

MitigationApply any vendor-provided patches for TCBServiSign. Until a patch is available, implement network-level controls to block suspicious websites and educate users about avoiding untrusted sites, as the attack requires user interaction with a malicious page.

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
Tcb ServisignApplication
Affected:< 1.0.24.0318

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
Network
Complexity
Low
Privileges
None
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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. Confirm TCBServiSign is installed
    Check for TCBServiSign (or TCB Servisign) in the list of installed programs via Windows Settings > Apps & features, or check for the executable in the program files directory
    Affected if The application is found on the system
  2. Identify the installed version
    Right-click the TCBServiSign executable, select Properties, and check the File version on the Details tab. Alternatively, check the Windows registry under HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall or HKCU\SOFTWARE for a version entry.
    Affected if The version number is lower than 1.0.24.0318
  3. Verify the application runs at user login or is active
    Check Task Manager for any running TCBServiSign processes, or check the Windows startup folder and registry run keys for TCBServiSign entries.
    Affected if The application is configured to run automatically and is currently active or scheduled to run
  4. Assess web browser exposure
    Review installed web browsers for any TCBServiSign browser extensions or plugins that may handle sensitive operations, as the vulnerability is triggered via spoofed websites.
    Affected if A browser extension or plugin associated with TCBServiSign is installed and enabled

You are affected if TCBServiSign (Changingtec Tcb Servisign) version 1.0.24.0318 or higher is NOT installed and the application is running on your system.

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 1.0.24.0318 or later
Fixed in 1.0.24.0318
Interim mitigation

Apply any vendor-provided patches for TCBServiSign. Until a patch is available, implement network-level controls to block suspicious websites and educate users about avoiding untrusted sites, as the attack requires user interaction with a malicious page.

Recommended fix Moderate confidence

1.0.24.0318

  1. Verify the current installed version of TCBServiSign on the Windows system
  2. Backup any critical data or configurations before upgrading
  3. Download TCBServiSign version 1.0.24.0318 or later from the official vendor (CHANGING Information Technology)
  4. Install the updated version following the vendor's standard installation procedure
  5. After installation, verify that the new version 1.0.24.0318 or higher is correctly installed
  6. Restart any services or applications that use TCBServiSign if necessary
  7. Confirm the vulnerability is mitigated by verifying that the API properly validates server-side input

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

Fix this in Tcb Servisign Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing4.0 h
  • Review / QA2.0 h
18.0 hours of engineering $3,200
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,120.

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-2024-40720 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