CVE-2017-8031
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 · uneditedAn issue was discovered in Cloud Foundry Foundation cf-release (all versions prior to v279) and UAA (30.x versions prior to 30.6, 45.x versions prior to 45.4, 52.x versions prior to 52.1). In some cases, the UAA allows an authenticated user for a particular client to revoke client tokens for other users on the same client. This occurs only if the client is using opaque tokens or JWT tokens validated using the check_token endpoint. A malicious actor could cause denial of service.
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 UAA (User Account and Authentication) component in Cloud Foundry cf-release and multiple UAA version lines contains an authorization flaw allowing an authenticated user to revoke tokens belonging to other users on the same client. This occurs specifically when clients use opaque tokens or JWT tokens validated via the check_token endpoint, enabling a malicious actor to cause denial of service by invalidating legitimate user sessions.
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<= 278>= 30, < 30.6>= 45, < 45.4= 52CVSS 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
- High
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/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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Check Cloud Foundry cf-release versionRun 'bosh releases' or inspect the deployment manifest for the cf-release version numberAffected if The cf-release version is 278 or lower
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Check UAA release versionRun 'bosh releases' or inspect the deployment manifest for the uaa-release version numberAffected if The UAA version is 30.x and less than 30.6, OR 45.x and less than 45.4, OR exactly 52 (before 52.1)
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Identify if opaque tokens are in useReview UAA configuration files (uaa.yml) and check if clients are configured with 'token_format: opaque' or are using the default token format without JWTAffected if Clients are configured to use opaque tokens for authentication
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Identify if check_token endpoint is used for JWT validationExamine UAA client configurations for 'check_token_url' endpoint usage, or inspect client applications that call the /check_token endpoint for JWT validationAffected if Client applications or API gateways use the UAA check_token endpoint to validate JWT tokens
A user is affected if their environment runs Cloud Foundry cf-release <=278 or UAA Release 30.x <30.6, 45.x <45.4, or 52.x <52.1 AND clients rely on opaque tokens or the check_token endpoint for JWT 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 data30.645.4
Upgrade UAA to version 30.6 (for 30.x), 45.4 (for 45.x), or 52.1 (for 52.x); or cf-release to v279 or later. Alternatively, avoid using opaque tokens or the check_token endpoint for JWT validation.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2017-8031 — 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-2017-8031 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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- Version or environment caveats, and links to real fixes
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