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CVE-2020-8565: Incomplete fix for CVE-2019-11250 allows for token leak in logs when logLevel >= 9 #95623

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sfowl opened this issue Oct 15, 2020 · 3 comments
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CVE-2020-8565: Incomplete fix for CVE-2019-11250 allows for token leak in logs when logLevel >= 9 #95623

sfowl opened this issue Oct 15, 2020 · 3 comments
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area/security committee/security-response Denotes an issue or PR intended to be handled by the product security committee. kind/bug Categorizes issue or PR as related to a bug. needs-triage Indicates an issue or PR lacks a `triage/foo` label and requires one. official-cve-feed Issues or PRs related to CVEs officially announced by Security Response Committee (SRC)

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@sfowl
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sfowl commented Oct 15, 2020 •
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CVSS Rating: 4.7 CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N (Medium)

In Kubernetes, if the logging level is to at least 9, authorization and bearer tokens will be written to log files. This can occur both in API server logs and client tool output like kubectl.

Am I vulnerable?

If kube-apiserver is using a log level of at least 9.

Affected Versions

kubernetes v1.19.0 - v1.19.5
kubernetes v1.18.0 - v1.18.13
kubernetes v1.17.0 - v1.17.15

How do I mitigate this vulnerability?

Do not enable verbose logging in production, limit access to logs.

Fixed Versions

kubernetes v1.20.0
kubernetes v1.19.6
kubernetes v1.18.14
kubernetes v1.17.16

To upgrade, refer to the documentation: https://kubernetes.io/docs/tasks/administer-cluster/cluster-management/#upgrading-a-cluster

Acknowledgements

This vulnerability was reported by: Patrick Rhomberg (purelyapplied)

/area security
/kind bug
/committee product-security
@sfowl sfowl added the kind/bug Categorizes issue or PR as related to a bug. label Oct 15, 2020
@k8s-ci-robot k8s-ci-robot added area/security committee/security-response Denotes an issue or PR intended to be handled by the product security committee. labels Oct 15, 2020
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@sfowl: This issue is currently awaiting triage.

If a SIG or subproject determines this is a relevant issue, they will accept it by applying the triage/accepted label and provide further guidance.

The triage/accepted label can be added by org members by writing /triage accepted in a comment.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

@k8s-ci-robot k8s-ci-robot added the needs-triage Indicates an issue or PR lacks a `triage/foo` label and requires one. label Oct 15, 2020
@sfowl
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sfowl commented Oct 15, 2020

Fixed by #95316

@sfowl sfowl closed this as completed Oct 15, 2020
@tengqm tengqm mentioned this issue Oct 20, 2020
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@RTann RTann mentioned this issue Oct 29, 2020
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@mend-for-github-com mend-for-github-com bot mentioned this issue Jan 8, 2021
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@PushkarJ
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PushkarJ commented Dec 2, 2021

/label official-cve-feed

(Related to kubernetes/sig-security#1)

@k8s-ci-robot k8s-ci-robot added the official-cve-feed Issues or PRs related to CVEs officially announced by Security Response Committee (SRC) label Dec 2, 2021
@joe-kimmel-vmw joe-kimmel-vmw mentioned this issue Dec 3, 2021
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@dev-mend-for-github-com dev-mend-for-github-com bot mentioned this issue Apr 7, 2022
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@k8s-sec-alert k8s-sec-alert mentioned this issue Sep 18, 2022
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@pdeslaur pdeslaur mentioned this issue Aug 27, 2023
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This was referenced May 7, 2024
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