CVE-2016-1905: Access Restriction Bypass in Kubernetes
Summary
CVE-2016-1905: Access Restriction Bypass in kubernetes. Affects github.com/kubernetes/kubernetes versions < 1.2.0-alpha.6. Fixed in 1.2.0-alpha.6. How to fix ↓
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Background
The package under scrutiny is github.com/kubernetes/kubernetes/pkg/apiserver, which is written in Go. Kubernetes is an open-source container orchestration platform that automates the deployment, scaling, and management of containerized applications. The apiserver package is responsible for handling API requests and enforcing access control policies. It provides a set of admission control mechanisms to validate and mutate API objects before they are persisted. However, a vulnerability in the API server allows remote authenticated users to bypass access restrictions and access additional resources by exploiting a flaw in the admission control process.
Vulnerability Detail
The vulnerability (CVE-2016-1905) arises from the API server's failure to properly check admission control. This allows remote authenticated users to craft a patched object that can bypass the admission control mechanisms. By submitting this object, an attacker can gain unauthorized access to additional resources within the Kubernetes cluster. The impact of this vulnerability can be severe, as it enables an attacker to escalate privileges and potentially compromise the entire cluster. The vulnerability has a CVSSv3 score of 7.7, indicating a high severity level.
How To Fix
Minimum fixed version
1.2.0-alpha.6
This is the first release that contains the fix.
go get github.com/kubernetes/kubernetes@v1.2.0-alpha.6Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
There is no specific workaround mentioned for this vulnerability. However, users can mitigate the risk by ensuring that only trusted and authenticated users have access to the Kubernetes API server. Additionally, implementing network segmentation and strong access control policies can help limit the impact of a potential breach.
Conclusion
The vulnerability (CVE-2016-1905) in the apiserver package of Kubernetes allows remote authenticated users to bypass access restrictions and gain unauthorized access to additional resources within the cluster. To mitigate this risk, it is crucial to upgrade to a fixed version of Kubernetes and implement strong access control measures. For further support on vulnerability remediation, please contact DevNack.com.
See every vulnerability recorded for github.com/kubernetes/kubernetes →
FAQ
Kubernetes is an open-source container orchestration platform that automates the deployment, scaling, and management of containerized applications.
The apiserver package in Kubernetes is responsible for handling API requests and enforcing access control policies.
The vulnerability in the apiserver package allows remote authenticated users to bypass access restrictions by exploiting a flaw in the admission control process. This enables them to access additional resources within the Kubernetes cluster.
The impact of this vulnerability can be severe, as it allows an attacker to escalate privileges and potentially compromise the entire Kubernetes cluster.
To fix this vulnerability, it is recommended to upgrade to a fixed version of Kubernetes (1.2.0-alpha.6 or later). Upgrading to the latest stable release is also advisable.
References
Related vulnerabilities
Recent vulnerabilities recorded for github.com/kubernetes/kubernetes.
