CVE-2018-16172
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 · uneditedImproper countermeasure against clickjacking attack in client certificates management screen was discovered in Cybozu Remote Service 3.0.0 to 3.1.8, that allows remote attackers to trick a user to delete the registered client certificate.
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 confidenceA clickjacking vulnerability exists in Cybozu Remote Service versions 3.0.0 through 3.1.8 within the client certificates management screen. Attackers can embed the application's interface in an invisible frame and trick authenticated users into clicking on hidden elements, specifically to delete registered client certificates. This improper countermeasure allows remote attackers to manipulate user actions through overlaid malicious interfaces.
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>= 3.0.0, <= 3.1.8CVSS 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
- None
- Integrity
- High
- Availability
- None
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
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 checksWork through these to decide whether this CVE applies to you.
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Check installed Cybozu Remote Service Manager versionLocate the installed version of Cybozu Remote Service Manager in the system information or about page, typically accessible via the administration console or product documentationAffected if The installed version falls within 3.0.0 through 3.1.8 (inclusive)
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Verify access to client certificates management screenLog in as an authenticated user and navigate to the client certificates management interface within the applicationAffected if The client certificates management functionality is accessible and enabled for the user
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Test for iframe embedding vulnerabilityAttempt to embed the application URL in an HTML iframe element from an external domain, or inspect HTTP response headers for X-Frame-Options and Content-Security-Policy frame-ancestors directivesAffected if The application can be embedded in a frame (no X-Frame-Options: DENY/SAMEORIGIN and no CSP frame-ancestors restricting embed)
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Confirm authenticated session exposureVerify that the application allows authenticated users to access sensitive functions via the web interface while the clickjacking frame can be overlaidAffected if The application processes actions from authenticated sessions when embedded in a third-party frame
The environment is affected if Cybozu Remote Service Manager version 3.0.0 through 3.1.8 is installed AND the application can be embedded in iframes by external sites, allowing attackers to trick authenticated users into deleting client certificates.
Generated from the published advisory. Verify against your own configuration.
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.
From vendor dataImplement X-Frame-Options: DENY or X-Frame-Options: SAMEORIGIN headers, and/or configure Content Security Policy (CSP) frame-ancestors directive to prevent the application from being embedded in iframes.
- Consultation2.0 h
- Implementation2.0 h
- Testing2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2018-16172 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2018-16172 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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