Security readout for executives and security teams
Plain-English summary
CVE-2018-13291 is an information exposure issue in Synology DSM before 6.2.1-23824. A logged-in remote user could read a world-readable mount configuration file and obtain sensitive information. Business impact is mainly confidentiality loss, not system takeover or outage based on the provided sources.
Executive priority
Treat as a moderate-priority hygiene fix. It does not indicate unauthenticated compromise, ransomware behavior, or service disruption, but it can expose sensitive NAS configuration data to any valid DSM user on unpatched systems.
Technical view
Synology DSM exposed /usr/syno/etc/mount.conf with permissions that allowed remote authenticated users to read sensitive configuration data. The CVSS 3.0 score is 4.3: network reachable, low complexity, low privileges required, no user interaction, and low confidentiality impact only.
Likely exposure
Exposure is limited to Synology DiskStation Manager deployments running versions before 6.2.1-23824 where remote authenticated users exist. The source bundle does not identify exact models, editions, or additional affected version ranges.
Exploitation context
The provided evidence does not show active exploitation, and the CVE is not marked as CISA KEV. Exploitation requires valid authentication. The issue may matter more in shared NAS environments where non-admin users can access DSM remotely.
Researcher notes
The key unknown is what sensitive data appears in mount.conf for specific DSM deployments. Validate exposure defensively on owned systems only, correlate with user access scope, and avoid assuming privilege escalation or code execution because the cited sources only support information disclosure.
Mitigation direction
- Upgrade DSM to 6.2.1-23824 or a later vendor-supported release.
- Review Synology advisory SA-18-51 for product-specific remediation guidance.
- Limit DSM access to trusted users and trusted networks.
- Remove or disable unnecessary low-privilege DSM accounts.
Validation and detection
- Inventory DSM versions and identify systems earlier than 6.2.1-23824.
- Confirm affected systems have been updated to a fixed vendor-supported DSM release.
- Review DSM account lists for unnecessary authenticated users.
- Check post-update permissions on mount configuration files through approved administrative procedures.
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-200: Information exposure and cloud metadata lookup
Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. 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-2018-13291 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
- 4.3 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/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:L/I:N/A:N2.81.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
4.3MediumVector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.synology.com/security/advisory/Synology_SA_18_51CVE 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.
Exposure of Sensitive Information to an Unauthorized Actor
Exposure of Sensitive Information to an Unauthorized Actor represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.