oss-security - [kubernetes] CVE-2022-3162: Unauthorized read of Custom Resources

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Message-ID: <CALXpagykvZnnXHHPk6DP6O_qX5O=TBQK6_j-vO5ZFot5HY1NsQ@mail.gmail.com>
Date: Thu, 10 Nov 2022 09:25:36 -0800
From: Tim Allclair <timallclair@...il.com>
To: oss-security@...ts.openwall.com
Subject: [kubernetes] CVE-2022-3162: Unauthorized read of Custom Resources

Hello Kubernetes Community,

A security issue was discovered in Kubernetes where users authorized to
list or watch one type of namespaced custom resource cluster-wide can read
custom resources of a different type in the same API group without
authorization.

This issue has been rated Medium (
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
<https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N>),
and assigned CVE-2022-3162
Am I vulnerable?

Clusters are impacted by this vulnerability if all of the following are
true:

   1.

   There are 2+ CustomResourceDefinitions sharing the same API group
   2.

   Users have cluster-wide list or watch authorization on one of those
   custom resources.
   3.

   The same users are not authorized to read another custom resource in the
   same API group.

Affected Versions

   -

   Kubernetes kube-apiserver <= v1.25.3
   -

   Kubernetes kube-apiserver <= v1.24.7
   -

   Kubernetes kube-apiserver <= v1.23.13
   -

   Kubernetes kube-apiserver <= v1.22.15

How do I mitigate this vulnerability?

Upgrading the kube-apiserver to a fixed version mitigates this
vulnerability.

Prior to upgrading, this vulnerability can be mitigated by avoiding
granting cluster-wide list and watch permissions.
Fixed Versions

   -

   Kubernetes kube-apiserver v1.25.4
   -

   Kubernetes kube-apiserver v1.24.8
   -

   Kubernetes kube-apiserver v1.23.14
   -

   Kubernetes kube-apiserver v1.22.16

These releases will be published over the course of today, November 10th.
Detection

Requests containing `..` in the request path are a likely indicator of
exploitation. Request paths may be captured in API audit logs, or in
kube-apiserver HTTP logs.

If you find evidence that this vulnerability has been exploited, please
contact security@...ernetes.io
Additional Details

See the GitHub issue for more details:
https://github.com/kubernetes/kubernetes/issues/113756
Acknowledgements

This vulnerability was reported by Richard Turnbull of NCC Group as part of
the Kubernetes Audit.

Thank You,

Tim Allclair on behalf of the Kubernetes Security Response Committee

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