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Router ManagerApplication · Synology

CVE-2017-15895

MEDIUM · 6.5 CVSS v3.0 Published 2017-12-08
Fix available
A fix is available. Upgrade to 1.1.5-6542-4 or later.
See remediation →
71/100
Remediation priority · Elevated
Remotely reachable 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
Directory traversal vulnerability in the SYNO.FileStation.Extract in Synology Router Manager (SRM) before 1.1.5-6542-4 allows remote authenticated users to write arbitrary files via the dest_folder_path parameter.

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 confidence

Directory traversal vulnerability in Synology Router Manager's SYNO.FileStation.Extract function allows authenticated users to write arbitrary files to the filesystem via the dest_folder_path parameter by using path traversal sequences (e.g., ../../). This can enable remote code execution if attackers write to privileged locations.

MitigationUpgrade Synology Router Manager to version 1.1.5-6542-4 or later. Until patched, restrict administrative access and monitor for unauthorized file creation in system directories.

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
Router ManagerApplication
Affected:< 1.1.5-6542-4

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
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/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 checks

Work through these to decide whether this CVE applies to you.

  1. Confirm Synology Router Manager is installed
    Log into the router's web interface and check System Information > Router Name or run 'cat /proc/sys/kernel/hostname' via SSH to identify if the device is a Synology router running SRM
    Affected if The device is a Synology router running Synology Router Manager
  2. Check installed SRM version
    In the web interface, go to Control Panel > System > Updates or navigate to Resource Monitor > About to view the exact SRM version number
    Affected if The version displayed is earlier than 1.1.5-6542-4 (e.g., 1.1.4, 1.1.3, etc.)
  3. Verify FileStation is accessible
    Check if the FileStation package or feature is installed and enabled in Package Center or Control Panel > File Services > File Station
    Affected if FileStation is installed and the Extract function is available to authenticated users
  4. Inspect for unauthorized file creation in system directories
    Use SSH to list files in /, /etc, /var, /opt, /home, and /root directories and check for unexpected files with recent timestamps using 'ls -lat / | head -20'
    Affected if Files appear in system directories (especially /, /etc, /var) that were not created by legitimate administrator actions, particularly executable or script files
  5. Review authentication logs for suspicious Extract operations
    Access router logs via Control Panel > Log Center or check /var/log/messages for entries containing 'FileStation' or 'Extract' with path traversal patterns like '../'
    Affected if Logs show Extract operations with '..' characters in the dest_folder_path parameter or operations targeting privileged directories

A user is affected if their Synology Router Manager version is below 1.1.5-6542-4 AND FileStation with the Extract function is accessible to authenticated users, especially if unauthenticated files exist in system directories or logs show traversal attempts.

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.

From vendor data
Upgrade available Upgrade to 1.1.5-6542-4 or later
Fixed in 1.1.5-6542-4
Interim mitigation

Upgrade Synology Router Manager to version 1.1.5-6542-4 or later. Until patched, restrict administrative access and monitor for unauthorized file creation in system directories.

Fix this in Router Manager Scoped from the published advisory
  • Consultation2.0 h
  • Implementation1.0 h
  • Testing2.0 h
  • Review / QA1.0 h
6.0 hours of engineering $1,060
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,696.

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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-2017-15895 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
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