CVE-2017-3891
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 · uneditedIn BlackBerry QNX Software Development Platform (SDP) 6.6.0, an elevation of privilege vulnerability in the default configuration of the QNX SDP with QNet enabled on networks comprising two or more QNet nodes could allow an attacker to access local and remote files or take ownership of files on other QNX nodes regardless of permissions by executing commands targeting arbitrary nodes from a secondary QNX 6.6.0 QNet node.
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 · moderate confidenceThis is an elevation of privilege vulnerability in QNX SDP 6.6.0 where the QNet networking component in its default configuration allows a user on one QNet node to execute commands on other nodes with elevated privileges, enabling unauthorized access to local and remote files and allowing file ownership takeover regardless of actual permission settings.
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= 6.6.0CVSS 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
- Adjacent
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Changed
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/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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Confirm QNX SDP versionRun 'uname -v' or check system information to identify if the installed version is QNX Software Development Platform 6.6.0Affected if The installed version is exactly 6.6.0 of Blackberry QNX Software Development Platform
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Identify if QNet is runningCheck for running QNet processes using 'pidin ar' or 'netstat -an' looking for QNet-related network listeners, or query the system for loaded networking modulesAffected if QNet (qnet) process or service is actively running on the system
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Verify QNet default configurationExamine QNet configuration files in /etc or /proc/boot for QNet settings, or check if QNet was started without explicit security restrictions using 'ls -la /etc/system/config/' or similar configuration pathsAffected if QNet is enabled with default configuration settings (no access controls or node restrictions configured)
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Check network exposureReview network interfaces and firewall rules to determine if QNet traffic on port 8005 or QNet's default transport is permitted to untrusted network segmentsAffected if QNet traffic can reach or be received from untrusted or external network nodes
A system is affected if it runs QNX SDP 6.6.0 with QNet enabled in its default configuration, allowing potentially untrusted network nodes to execute commands with elevated privileges.
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 QNet if not required, implement network segmentation to restrict QNet traffic to trusted nodes only, and apply any available vendor patches for QNX SDP 6.6.0.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA3.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2017-3891 — 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-2017-3891 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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