CVE-2023-35165: AWS CDK EKS overly permissive trust policies
First published: Fri Jun 23 2023(Updated: )
AWS Cloud Development Kit (AWS CDK) is an open-source software development framework to define cloud infrastructure in code and provision it through AWS CloudFormation. In the packages `aws-cdk-lib` 2.0.0 until 2.80.0 and `@aws-cdk/aws-eks` 1.57.0 until 1.202.0, `eks.Cluster` and `eks.FargateCluster` constructs create two roles, `CreationRole` and `default MastersRole`, that have an overly permissive trust policy. The first, referred to as the `CreationRole`, is used by lambda handlers to create the cluster and deploy Kubernetes resources (e.g `KubernetesManifest`, `HelmChart`, ...) onto it. Users with CDK version higher or equal to 1.62.0 (including v2 users) may be affected. The second, referred to as the `default MastersRole`, is provisioned only if the `mastersRole` property isn't provided and has permissions to execute `kubectl` commands on the cluster. Users with CDK version higher or equal to 1.57.0 (including v2 users) may be affected. The issue has been fixed in `@aws-cdk/aws-eks` v1.202.0 and `aws-cdk-lib` v2.80.0. These versions no longer use the account root principal. Instead, they restrict the trust policy to the specific roles of lambda handlers that need it. There is no workaround available for CreationRole. To avoid creating the `default MastersRole`, use the `mastersRole` property to explicitly provide a role.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Amazon Aws Cloud Development Kit | >=1.57.0<1.202.0 | |
| Amazon Aws Cloud Development Kit | >=2.0.0<2.80.0 |
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Reference Links
Frequently Asked Questions
What is CVE-2023-35165?
CVE-2023-35165 is a vulnerability in AWS Cloud Development Kit (AWS CDK) that allows an attacker to execute arbitrary code or escalate privileges.
What is the severity of CVE-2023-35165?
CVE-2023-35165 has a severity rating of 8.8, which is considered high.
How does CVE-2023-35165 impact AWS CDK?
CVE-2023-35165 affects the packages aws-cdk-lib 2.0.0 until 2.80.0 and @aws-cdk/aws-eks 1.57.0 until 1.202.0 in AWS CDK.
How can I fix CVE-2023-35165?
To fix CVE-2023-35165, you should upgrade to a version of AWS CDK that is not affected by the vulnerability (above 2.80.0 for aws-cdk-lib and above 1.202.0 for @aws-cdk/aws-eks).
Can you provide more information about CVE-2023-35165?
For more information about CVE-2023-35165, you can refer to the official GitHub repository of AWS CDK and the security advisories.
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