Security readout for executives and security teams
Plain-English summary
CVE-2018-20298 affects S3 Browser versions before 8.1.5. A malicious S3-compatible server could trick a user’s client into processing unsafe XML, potentially exposing local files or NTLMv2 hashes. Business urgency depends on whether the tool is installed and used to connect to untrusted S3 endpoints.
Executive priority
Treat as a targeted workstation exposure issue. Prioritize teams using S3 Browser for cloud storage operations, because compromise could expose sensitive local files or reusable authentication material.
Technical view
The issue is an XML external entity vulnerability in S3 Browser before 8.1.5. The CVE states remote attackers can read arbitrary files and obtain NTLMv2 hash values by tricking a user into connecting to a malicious server via the S3 protocol.
Likely exposure
Exposure is likely limited to endpoints running S3 Browser before 8.1.5, especially where users connect to third-party or untrusted S3-compatible services.
Exploitation context
The source bundle does not show CISA KEV listing or confirmed active exploitation. Exploitation requires user interaction: connecting the vulnerable client to a malicious S3 server.
Researcher notes
Evidence is sparse in the bundle: no CVSS, CWE, exploit proof, or detailed vendor fix text is provided. The version boundary and impact come from the CVE description and linked public references.
Mitigation direction
- Inventory endpoints for S3 Browser installations and versions.
- Upgrade S3 Browser installations older than 8.1.5.
- Restrict use of untrusted S3-compatible endpoints.
- Review vendor release notes and PT Security advisory for guidance.
- Monitor for unexpected outbound authentication attempts involving NTLMv2.
Validation and detection
- Confirm installed S3 Browser versions are 8.1.5 or later.
- Check software inventory for unmanaged S3 Browser installations.
- Review endpoint logs for connections to untrusted S3-compatible servers.
- Review network telemetry for unusual NTLMv2 authentication exposure.
- Confirm users handling S3 access know approved endpoint lists.
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.
CVE-2018-20298 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
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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 and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://www.ptsecurity.com/ww-en/analytics/threatscape/pt-2018-34/CVE reference · x_refsource_MISC
- https://s3browser.com/news.aspxCVE reference · x_refsource_MISC
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.