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GHSA-x45c-cvp8-q4fm
No affected components available
Capsule implements a multi-tenant and policy-based environment in a Kubernetes cluster. A ServiceAccount deployed in a Tenant Namespace, when granted with PATCH capabilities on its own Namespace, is able to edit it and remove the Owner Reference, breaking the reconciliation of the Capsule Operator and removing all the enforcement like Pod Security annotations, Network Policies, Limit Range and Resource Quota items.
With that said, an attacker could detach the Namespace from a Tenant that is forbidding starting privileged Pods using the Pod Security labels by removing the OwnerReference, removing the enforcement labels, and being able to start privileged containers that would be able to start a generic Kubernetes privilege escalation.
Patches
Patches have been released for version 0.1.3 and all users must upgrade to this release.
Workarounds
N.A.
References
N.A.
For more information
If you have any questions or comments about this advisory:
- Open an issue in github.com/clastix/capsule
- Reach out on #capsule channel available on Kubernetes Slack workspace
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data. There is a high impact on the availability of the system.
Exploitation activity has been observed. Apply available patches or mitigations urgently.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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