CVE-2018-2502
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 · uneditedTRACE method is enabled in SAP Business One Service Layer . Attacker can use XST (Cross Site Tracing) attack if frontend applications that are using Service Layer has a XSS vulnerability. This has been fixed in SAP Business One Service Layer (B1_ON_HANA, versions 9.2, 9.3).
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 TRACE HTTP method is enabled in SAP Business One Service Layer, allowing an attacker to perform Cross-Site Tracing (XST) attacks. When combined with existing XSS vulnerabilities in frontend applications using the Service Layer, attackers can bypass HttpOnly cookie protections and steal session credentials.
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= 9.2= 9.3CVSS 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
- None
- User interaction
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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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Identify SAP Business One versionCheck the installed SAP Business One On HANA version through SAP Business One version information in SAP B1 Server Tools or the System Landscape Directory (SLD). Compare against affected versions 9.2 and 9.3.Affected if Running version 9.2 or 9.3 of SAP Business One On HANA
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Confirm Service Layer is enabledVerify that the SAP Business One Service Layer is installed and exposed. This is typically accessible via HTTP/HTTPS on port 50000 or custom port configured during Service Layer installation.Affected if Service Layer is enabled and accessible on the network
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Test TRACE method availability on Service LayerSend an HTTP TRACE request to the Service Layer endpoint (e.g., using curl -X TRACE http://<hostname>:50000/b1s/v1/) and examine if a response is received with the request headers reflected back.Affected if TRACE method returns a 200 OK response with request headers reflected in the body, indicating the method is enabled
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Inspect web server configuration for TRACE handlingReview the web server configuration (IIS, Apache, or SAP Business One Web dispatcher) hosting the Service Layer for any ALLOW or ENABLE settings for the TRACE HTTP method.Affected if Web server configuration allows TRACE method or lacks explicit blocking for TRACE
Environment is affected if running SAP Business One On HANA version 9.2 or 9.3 with Service Layer enabled and the TRACE HTTP method is not disabled at the web server level, allowing reflected headers in responses.
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 dataDisable the TRACE HTTP method at the SAP Business One Service Layer server configuration (typically at the web server level) to prevent XST attacks. Ensure frontend applications are also patched for XSS vulnerabilities as the XST attack chains with XSS.
- Consultation2.0 h
- Implementation2.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2018-2502 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
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-2018-2502 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
No notes yet
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- 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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