The 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. Users who use IAM OIDC custom resource provider package will download CA Thumbprints as part of the custom resource workflow. However, the current `tls.connect` method will always set `rejectUnauthorized: false` which is a potential security concern. CDK should follow the best practice and set `rejectUnauthorized: true`. However, this could be a breaking change for existing CDK applications and we should fix this with a feature flag. Note that this is marked as low severity Security advisory because the issuer url is provided by CDK users who define the CDK application. If they insist on connecting to a unauthorized OIDC provider, CDK should not disallow this. Additionally, the code block is run in a Lambda environment which mitigate the MITM attack. The patch is in progress. To mitigate, upgrade to CDK v2.177.0 (Expected release date 2025-02-22). Once upgraded, users should make sure the feature flag '@aws-cdk/aws-iam:oidcRejectUnauthorizedConnections' is set to true in `cdk.context.json` or `cdk.json`. There are no known workarounds for this vulnerability.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - The 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. Users who use IAM OIDC custom resource
    provider package will download CA Thumbprints as part of the custom resource workflow. However, the
    current `tls.connect` method will always set `rejectUnauthorized: false` which is a potential security
    concern. CDK should follow the best practice and set `rejectUnauthorized: true`. However, this could be a
    breaking change for existing CDK applications and we should fix this with a feature flag. Note that this
    is marked as low severity Security advisory because the issuer url is provided by CDK users who define the
    CDK application. If they insist on connecting to a unauthorized OIDC provider, CDK should not disallow
    this. Additionally, the code block is run in a Lambda environment which mitigate the MITM attack. The
    patch is in progress. To mitigate, upgrade to CDK v2.177.0 (Expected release date 2025-02-22). Once
    upgraded, users should make sure the feature flag '@aws-cdk/aws-iam:oidcRejectUnauthorizedConnections' is
    set to true in `cdk.context.json` or `cdk.json`. There are no known workarounds for this vulnerability.
    (CVE-2025-23206)

ID	Name	Product	Family	Type	Severity
421287	SCA: security update for aws-cdk-lib (GHSA-v4mq-x674-ff73)	Tenable Cloud Security	SCA Checks	Local	low
421287	SCA: security update for aws-cdk-lib (GHSA-v4mq-x674-ff73)	Tenable Self-Hosted Container Security	SCA Checks	Local	low

Detections

Analytics

CVE-2025-23206

low

Tenable Plugins

low

low