Security readout for executives and security teams
Plain-English summary
This vulnerability affects Synology DiskStation Manager systems before DSM 6.2-23739-1. A logged-in remote user could read a configuration file with overly broad default permissions and obtain sensitive information. It is not described as unauthenticated or code execution, but it can expose information on NAS systems that often hold business-critical data.
Executive priority
Treat this as a moderate confidentiality issue. It should be remediated in normal patch cycles, faster for internet-exposed or multi-user NAS environments. The main business concern is sensitive account or configuration information disclosure by someone with valid DSM access.
Technical view
CVE-2018-13286 is a CWE-276 incorrect default permissions issue in DSM's synouser.conf. The file was world-readable, allowing remote authenticated users to obtain sensitive information. The CVSS 3.0 score is 6.5 with network attack vector, low complexity, low privileges required, no user interaction, and high confidentiality impact.
Likely exposure
Exposure is likely limited to Synology DSM deployments before 6.2-23739-1 where an attacker already has authenticated access. Risk rises where DSM accounts are broadly issued, externally reachable, or shared across staff, contractors, or services.
Exploitation context
The source bundle does not show CISA KEV listing or confirmed active exploitation. The public description indicates exploitation requires a remote authenticated user and centers on reading sensitive configuration data, not modifying systems or disrupting availability.
Researcher notes
Evidence is strong on vulnerability class, affected product, fixed threshold, and CVSS vector. The source bundle does not provide exploit details, observed exploitation, or a complete affected-version matrix beyond DSM before 6.2-23739-1.
Mitigation direction
- Update affected DSM systems to 6.2-23739-1 or later.
- Review Synology advisory Synology_SA_18_33 for vendor guidance.
- Inventory DSM devices and prioritize externally reachable systems.
- Remove unnecessary DSM user accounts and shared credentials.
- Limit DSM access to trusted users and networks where operationally feasible.
Validation and detection
- Confirm each DSM device version is 6.2-23739-1 or later.
- Identify DSM systems running versions before 6.2-23739-1.
- Check whether untrusted or stale accounts can authenticate to DSM.
- Verify synouser.conf is not world-readable after remediation.
- Review available logs for unusual authenticated DSM access.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-276: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2018-13286 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.5 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N2.83.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
6.5MediumVector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.synology.com/security/advisory/Synology_SA_18_33CVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Incorrect Default Permissions
Incorrect Default Permissions represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.