CVE-2018-13286
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 · uneditedIncorrect default permissions vulnerability in synouser.conf in Synology Diskstation Manager (DSM) before 6.2-23739-1 allows remote authenticated users to obtain sensitive information via the world readable configuration.
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 confidenceThe synouser.conf configuration file in Synology DiskStation Manager versions prior to 6.2-23739-1 was shipped with world-readable permissions (666 or similar), allowing any authenticated user on the network to read sensitive user configuration data. This is an information disclosure vulnerability stemming from incorrect default file permissions rather than a code flaw.
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>= 5.2, < 5.2-5967-8>= 6.0, < 6.0.3-8754-8>= 6.1, < 6.1.7-15284-1>= 6.2, < 6.2-23739-1CVSS 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
- None
- Availability
- None
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/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 DSM versionRun 'cat /etc/VERSION' on the Synology CLI or check via the web interface at Control Panel > Info Center to determine the installed DSM versionAffected if The installed version is 5.2 up to 5.2-5967-7, 6.0 up to 6.0.3-8754-7, 6.1 up to 6.1.7-15284, or 6.2 up to 6.2-23738 (any version prior to the fixed releases)
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Locate synouser.confLocate the synouser.conf configuration file on the system (typically found in /etc/ or the system configuration directory)Affected if The synouser.conf file exists on the Synology system
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Check file permissionsRun 'ls -la' on the synouser.conf file or use 'stat' to view the octal permissions (for example: ls -la /etc/synouser.conf)Affected if The file permissions are world-readable, indicated by 'rw-rw-rw-' (666) or equivalent permissions that allow any user on the system to read the file
A system is affected if it runs a vulnerable DSM version listed above AND the synouser.conf file has world-readable permissions that allow any authenticated user to read sensitive user configuration data.
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 data5.2-5967-86.0.3-8754-86.1.7-15284-1
Upgrade Synology DSM to version 6.2-23739-1 or later, which corrects the default permissions on synouser.conf to restrict access appropriately. If immediate patching is not possible, manually adjust file permissions on synouser.conf to remove world-readable access.
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- Implementation1.0 h
- Testing1.0 h
- Review / QA1.0 h
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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 sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2018-13286 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
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- Version or environment caveats, and links to real fixes
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