CVE-2011-4334
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 · uneditededit.php in LabWiki 1.1 and earlier does not properly verify uploaded user files, which allows remote authenticated users to upload arbitrary PHP files via a PHP file with a .gif extension in the userfile parameter.
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 confidenceLabWiki 1.1 and earlier contains an arbitrary file upload vulnerability in edit.php where the application only checks the file extension (.gif) but not the actual file content, allowing authenticated users to upload executable PHP files that can be accessed via the web server to achieve remote code execution.
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<= 1.1CVSS 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
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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 LabWiki installationSearch the web server document root for LabWiki files, particularly looking for a directory or file named 'Labwiki', 'labwiki', or containing 'edit.php' that belongs to the LabWiki applicationAffected if LabWiki software is found on the server
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Determine LabWiki versionCheck for version information in LabWiki source files such as README, CHANGELOG, or a version constant in the main PHP files. Compare the found version against the affected range: <= 1.1Affected if The installed version is 1.1 or any earlier version
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Locate edit.php upload scriptFind the edit.php file within the LabWiki installation directory and verify it contains file upload functionality by searching for form elements with 'file' type inputs or 'move_uploaded_file' function callsAffected if edit.php exists and contains file upload handling code
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Check extension-based validation onlyExamine the edit.php code to verify it performs file type validation using only file extension checking (e.g., checking for '.gif') without inspecting file content (magic bytes) or using an allowlist of permitted typesAffected if The code only validates by extension and does not perform content-type or magic byte verification
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Verify web-accessible upload directoryCheck if uploaded files are stored in a directory accessible via the web server (within document root) and retain their original or executable extensionsAffected if Uploaded files can be accessed directly via HTTP and retain executable extensions like .php
The environment is affected if LabWiki version 1.1 or earlier is installed, edit.php with file upload functionality exists, and uploaded files are stored in a web-accessible location without proper content validation.
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 dataImplement proper server-side file validation using magic byte verification and an allowlist of permitted file types, store uploaded files outside the web root or rename to non-executable extensions, and consider removing the upload functionality if not required.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,800.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2011-4334 — 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-2011-4334 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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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- 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
- No spam, self-promotion, credentials, or personal data