CVE-2009-1769
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 · uneditedThe web interface in Open Computer and Software Inventory Next Generation (OCS Inventory NG) 1.01 generates different error messages depending on whether a username is valid, which allows remote attackers to enumerate valid usernames.
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 OCS Inventory NG 1.01 web interface returns distinct error messages for valid versus invalid usernames during authentication, enabling remote attackers to enumerate existing user accounts through differential response analysis.
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= 1.01CVSS 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
- Authentication
- None
- Confidentiality
- Partial
- Integrity
- None
- Availability
- None
AV:N/AC:L/Au:N/C:P/I:N/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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Verify OCS Inventory NG versionLocate the version file or check the web interface footer/admin pages for the installed OCS Inventory NG version numberAffected if The installed version is 1.01 (exact match to affected version)
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Access the login pageNavigate to the OCS Inventory NG web interface login URL and locate the authentication formAffected if The login page is accessible and accepts username/password input
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Test with non-existent usernameEnter a clearly invalid username (e.g., 'nonexistentuser123') with any password and submit the login form. Record the exact error message returned.Affected if An error message is displayed for invalid username
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Test with valid username and wrong passwordEnter a valid administrative or known username with an incorrect password and submit the login form. Record the exact error message returned.Affected if An error message is displayed for wrong password with valid username
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Compare error message differencesExamine both error messages from steps 3 and 4. Check if the message content, wording, or timing differs between invalid username and valid username with wrong password.Affected if The error messages differ in content or timing, revealing whether the username exists in the system
The environment is affected if the installed OCS Inventory NG version is 1.01 AND the login page returns different error messages for invalid usernames versus valid usernames with wrong passwords.
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 uniform, generic error messages for failed login attempts that do not reveal whether the username or password was incorrect.
- Consultation1.0 h
- Implementation2.0 h
- Testing2.0 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 $1,664.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2009-1769 — 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-2009-1769 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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