CVE-2018-6603
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 · uneditedPromise Technology WebPam Pro-E devices allow remote attackers to conduct XSS, HTTP Response Splitting, and CRLF Injection attacks via JavaScript code in a PHPSESSID cookie.
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 WebPam Pro-E device fails to properly sanitize or validate the PHPSESSID cookie value before processing it. An attacker can inject arbitrary JavaScript code into this cookie, enabling cross-site scripting (XSS) attacks against users, as well as HTTP Response Splitting and CRLF Injection by inserting carriage return and line feed characters to manipulate HTTP response headers.
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 dataall versionsCVSS 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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Confirm the device is WebPam Pro-EAccess the device's web interface and check the login page or system information page for product identification. Look for 'Webpam Proe' or 'Promise Webpam Proe' branding in the page source or UI. Alternatively, check the HTTP server banner or favicon for clues.Affected if The device identifies itself as Webpam Proe or Promise Webpam Proe in the web interface or HTTP headers.
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Verify the web management interface is accessibleAttempt to reach the device's web interface via HTTP (typically ports 80, 443, or 8080). Confirm you receive a valid HTTP response from the WebPam application.Affected if The WebPam Pro-E web interface is reachable and responds to HTTP requests.
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Test for XSS injection in PHPSESSID cookieSend an HTTP request to the login page or any authenticated endpoint with a crafted PHPSESSID cookie containing a simple XSS payload such as '<script>alert(1)</script>'. Then capture the response and examine whether the cookie value is reflected verbatim in any part of the HTML response without encoding or sanitization.Affected if The PHPSESSID value is reflected in the response body without HTML encoding (e.g., you see '<script>' instead of '<script>').
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Test for CRLF injection in PHPSESSID cookieSend an HTTP request with a PHPSESSID cookie containing CRLF characters (such as 'test%0D%0AHeader:+Value') and examine whether the application splits the response or includes custom headers that were injected.Affected if The response includes injected HTTP headers or the response is split based on the crafted cookie value.
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Check if any input filtering existsSend multiple variations of the PHPSESSID cookie with special characters (quotes, angle brackets, newlines, null bytes) and compare the responses. Look for any sanitization, rejection, or modification of these characters.Affected if The application accepts and reflects special characters in the PHPSESSID cookie without filtering, encoding, or rejecting them.
If the device is a Promise Webpam Proe with an accessible web interface, and the PHPSESSID cookie is reflected without sanitization or allows CRLF injection, the environment is affected by CVE-2018-6603.
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 dataValidate and sanitize all cookie values, including PHPSESSID, before processing. Implement proper output encoding and ensure the application rejects malformed session identifiers. If vendor firmware updates are available, apply them. Otherwise, consider network-level filtering to block malformed cookie values.
- Consultation2.0 h
- Implementation4.0 h
- Testing2.0 h
- Review / QA1.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2018-6603 — 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-2018-6603 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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