CVE-2023-20881
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 · uneditedCloud foundry instances having CAPI version between 1.140 and 1.152.0 along with loggregator-agent v7+ may override other users syslog drain credentials if they're aware of the client certificate used for that syslog drain. This applies even if the drain has zero certs. This would allow the user to override the private key and add or modify a certificate authority used for the connection.
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 confidenceA privilege escalation vulnerability in Cloud Foundry's CAPI (versions 1.140-1.152.0) combined with loggregator-agent v7+ allows authenticated users to override other users' syslog drain credentials by knowing the client certificate, even for drains configured with zero certificates. This enables attackers to modify private keys and add or alter certificate authorities for connections they don't own.
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>= 1.140, <= 1.152.0>= 24.7.0, <= 29.0.0>= 7.0, <= 7.2.1CVSS 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
- None
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/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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Check CAPI release versionQuery the CAPI release version using 'bosh releases | grep capi' or inspect the deployed stemcell and release manifest in your Cloud Foundry deploymentAffected if The installed CAPI version is between 1.140 and 1.152.0 inclusive
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Check loggregator-agent versionQuery the loggregator-agent release version using 'bosh releases | grep loggregator' or inspect the deployment manifestAffected if The installed loggregator-agent version is between 7.0 and 7.2.1 inclusive
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Identify configured syslog drainsUse 'cf curl /v2/service_bindings' or query the CAPI database to list all syslog drain configurations in useAffected if Any syslog drains are configured in the environment, regardless of certificate count
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Verify drain authorization settingsReview the CAPI loggregator authorization configuration in the deployment manifest to confirm whether drain credential ownership is properly enforcedAffected if The authorization allows any authenticated user to modify drains belonging to other users based solely on knowing the client certificate
You are affected if your environment runs CAPI versions 1.140-1.152.0 combined with loggregator-agent 7.0-7.2.1 and has any syslog drains configured, as the authorization bypass enables credential override for drains you do not own.
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.
dbcve · scopedUpgrade CAPI to version 1.152.1 or later and loggregator-agent to the patched version to remediate the authorization bypass in syslog drain credential handling.
CAPI Release >= 1.153.0, Cf Deployment >= 29.1.0, Loggregator Agent >= 7.3.0
- 1. Identify the current CAPI Release version in your Cloud Foundry deployment by checking the deployed releases (cf deployment or bosh deployments)
- 2. Identify the current Loggregator Agent version by checking the deployed releases
- 3. Identify the current Cf Deployment version by checking the deployed releases
- 4. Upgrade CAPI Release to version 1.153.0 or later
- 5. Upgrade Cf Deployment to version 29.1.0 or later (which includes the fixed CAPI)
- 6. Upgrade Loggregator Agent to version 7.3.0 or later
- 7. Redeploy the Cloud Foundry foundation with the updated versions
- 8. Verify the upgrade by testing syslog drain functionality and confirming credentials cannot be overridden by unauthorized users
Generated from the published advisory — verify against the referenced sources before acting.
- 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-2023-20881 — 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-2023-20881 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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