CVE-2018-1000209
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 · uneditedSensu, Inc. Sensu Core version Before version 1.4.2-3 contains a Insecure Permissions vulnerability in Sensu Core on Windows platforms that can result in Unprivileged users may execute code in context of Sensu service account. This attack appear to be exploitable via Unprivileged user may place an arbitrary DLL in the c:\opt\sensu\embedded\bin directory in order to exploit standard Windows DLL load order behavior. This vulnerability appears to have been fixed in 1.4.2-3 and later.
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 confidenceSensu Core before version 1.4.2-3 on Windows had insecure file permissions allowing unprivileged users to write to the c:\opt\sensu\embedded\bin directory. Attackers could place a malicious DLL there to exploit Windows DLL load order behavior, resulting in code execution with the privileges of the Sensu service account.
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< 1.4.2-3CVSS 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
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.0/AV:N/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 checksWork through these to decide whether this CVE applies to you.
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Verify Windows operating systemConfirm the system is running Windows (this vulnerability only affects Sensu Core on Windows). Use 'systeminfo' command or check OS via 'winver' or PowerShell 'Get-ComputerInfo'Affected if System is not running Windows - this vulnerability does not apply to Linux/macOS versions of Sensu Core
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Check installed Sensu Core versionRun 'sensu-backend -v' or 'sensu-client -v' to display the installed Sensu version. Alternatively, check the Sensu installation directory for version information or use the package manager (chocolatey, etc.) to query the installed package versionAffected if Version is lower than 1.4.2-3 (e.g., 1.4.1, 1.4.0, earlier versions)
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Verify vulnerable directory existsCheck if the path c:\opt\sensu\embedded\bin exists on the system using 'Test-Path c:\opt\sensu\embedded\bin' in PowerShell or 'dir c:\opt\sensu\embedded\bin' in Command PromptAffected if Directory exists - this is the vulnerable path where unprivileged write access could allow DLL injection
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Inspect permissions on the vulnerable directoryRight-click the c:\opt\sensu\embedded\bin folder, go to Properties > Security tab, or run 'icacls c:\opt\sensu\embedded\bin' to list ACLs. Verify which users/groups have Write or Create Files permissionsAffected if Non-privileged users (such as Users group,Authenticated Users, or specific non-admin accounts) have Write or Create permissions to this directory - this enables the DLL injection attack vector
A user is affected if running Sensu Core on Windows with version lower than 1.4.2-3 AND the c:\opt\sensu\embedded\bin directory exists with write permissions accessible to unprivileged users.
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 data1.4.2-3
Upgrade Sensu Core to version 1.4.2-3 or later. As a compensating control, restrict write permissions on c:\opt\sensu\embedded\bin to only privileged administrators.
- Consultation3.0 h
- Implementation4.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2018-1000209 — 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-2018-1000209 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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