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`cilium-cli` disables etcd authorization for clustermesh clusters

Moderate severity GitHub Reviewed Published Mar 21, 2023 in cilium/cilium-cli • Updated Mar 22, 2023

Package

gomod github.com/cilium/cilium-cli (Go)

Affected versions

< 0.13.2

Patched versions

0.13.2

Description

Impact

cilium-cli, when used to configure cluster mesh functionality, can remove the enforcement of user permissions on the etcd store used to mirror local cluster information to remote clusters.

Due to an incorrect mount point specification, the settings specified by the initContainer that configures etcd users and their permissions are overwritten when using cilium-cli to configure a cluster mesh. An attacker who has already gained access to a valid key and certificate for an etcd cluster compromised in this manner could then modify state in that etcd cluster.

Patches

This issue is patched in cilium-cli 0.13.2

All previous versions of cilium-cli are affected. Users who have set up cluster meshes using the Cilium Helm chart are not affected.

Workarounds

Use Cilium's Helm charts to create your cluster instead.

Acknowledgements

The Cilium community has worked together with members of Isovalent to prepare these mitigations. Special thanks to Marco Iorio for investigating and fixing the issue.

For more information

If you have any questions or comments about this advisory, please reach out on Slack.

As usual, if you think you found a related vulnerability, we strongly encourage you to report security vulnerabilities to our private security mailing list: [email protected] - first, before disclosing them in any public forums. This is a private mailing list where only members of the Cilium internal security team are subscribed to, and is treated as top priority.

References

@aanm aanm published to cilium/cilium-cli Mar 21, 2023
Published to the GitHub Advisory Database Mar 21, 2023
Reviewed Mar 21, 2023
Published by the National Vulnerability Database Mar 22, 2023
Last updated Mar 22, 2023

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Adjacent
Attack complexity
Low
Privileges required
High
User interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N

EPSS score

0.045%
(17th percentile)

Weaknesses

CVE ID

CVE-2023-28114

GHSA ID

GHSA-6f27-3p6c-p5jc

Source code

Credits

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