Kubernetes Command Injection Flaw Allows SYSTEM Code Execution
As per most modern experiences, Kubernetes has been stumbled on with a remote code execution vulnerability, which would possibly presumably well enable a possibility actor to carry out code on the affected Dwelling windows endpoints within a Kubernetes Cluster with SYSTEM privileges.
To profit from this vulnerability, the possibility actor must have “bid” privileges on Kubernetes, which is important to work alongside with the Kubernetes API.
Exploitation takes method via a malicious YAML file on the cluster. This vulnerability has a CVE ID of CVE-2023-3676 and a CVSS salvage of 8.8 (Excessive).
Previous YAML and Kubernetes Exploitation
Kubernetes uses YAML recordsdata for unprejudiced about all the issues, from configuring, automated deployment, scaling, and managing containerized functions pod administration, and plenty others.
CVE-2022-1471, which existed in the constructor of SnakeYAML and ended in remote code execution in inclined functions, change into as soon as chanced on in 2022.
Kubernetes themselves stumbled on many vulnerabilities love CVE-2021-25749 (sail as ContainerAdministrator even when those workloads divulge the runAsNonRoot strategy to gorgeous), CVE-2017-1002101 and CVE-2021-25741 (flee instances and symlinks in conjunction with the subPath subproperty in a YAML file).
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Vulnerability Description
Primarily based completely on the experiences shared with Cyber Security Records, When increasing a pod, customers can moreover invent a shared directory between the pod and the host called “volumes.”
To enable the volumes, the YAML file must be added with the volume parameter alongside with mountPath (set apart of the container) and hostPath (set apart of the host).
The subPath subproperty can moreover be extinct to mount the shared directory in a chosen set apart.
This YAML file is then parsed by kubelet, which validates every parameter in the YAML file and ensures no symlinks are created on the subPath parameter the usage of the assistance of isLinkPath within characteristic.
The subPath subproperty on the YAML file is taken as a parameter and creates a PowerShell uncover to obtain the path sort. This PowerShell uncover is then despatched to the exec. Uncover characteristic call.
Extra investigation printed that “exec.Uncover” will be blended with unsanitized user-equipped enter, ensuing in a uncover injection vulnerability.
Akamai has printed a total document on this vulnerability, which supplies detailed recordsdata in regards to the exploitation methodology, patch diagnosis, mitigations, and a Github repository containing the proof-of-thought for this vulnerability.
It is quick for organizations to upgrade to the most up-to-date version of Kubernetes to forestall this vulnerability from getting exploited.
Source credit : cybersecuritynews.com
