Sidero Labs Talos Linux up to 1.2.1 API permission assignment

Summaryinfo

A vulnerability was found in Sidero Labs Talos Linux up to 1.2.1 and classified as problematic. This affects an unknown part of the component API. Executing a manipulation can lead to permission assignment. This vulnerability appears as CVE-2022-36103. The attack may be performed from remote. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Sidero Labs Talos Linux up to 1.2.1 and classified as critical. This vulnerability affects an unknown code of the component API. The manipulation with an unknown input leads to a permission assignment vulnerability. The CWE definition for the vulnerability is CWE-732. The product specifies permissions for a security-critical resource in a way that allows that resource to be read or modified by unintended actors. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Talos Linux is a Linux distribution built for Kubernetes deployments. Talos worker nodes use a join token to get accepted into the Talos cluster. Due to improper validation of the request while signing a worker node CSR (certificate signing request) Talos control plane node might issue Talos API certificate which allows full access to Talos API on a control plane node. Accessing Talos API with full level access on a control plane node might reveal sensitive information which allows full level access to the cluster (Kubernetes and Talos PKI, etc.). Talos API join token is stored in the machine configuration on the worker node. When configured correctly, Kubernetes workloads don't have access to the machine configuration, but due to a misconfiguration workload might access the machine configuration and reveal the join token. This problem has been fixed in Talos 1.2.2. Enabling the Pod Security Standards mitigates the vulnerability by denying hostPath mounts and host networking by default in the baseline policy. Clusters that don't run untrusted workloads are not affected. Clusters with correct Pod Security configurations which don't allow hostPath mounts, and secure access to cloud metadata server (or machine configuration is not supplied via cloud metadata server) are not affected.

The weakness was presented 09/13/2022 as GHSA-7hgc-php5-77qq. The advisory is shared for download at github.com. This vulnerability was named CVE-2022-36103 since 07/15/2022. There are neither technical details nor an exploit publicly available.

Upgrading to version 1.2.2 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 9eaf33f3f274e746ca1b442c0a1a0dae0cec088f is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• Sidero Labs

Name

• Talos Linux

Version

• 1.2.0
• 1.2.1

License

• open-source

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CPE 2.2info

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