CVE-2025-23206
However, the current `tls.connect` method will always set `rejectUnauthorized: false` which is a potential security concern.
Does this matter?
Lower severity and a low EPSS score (0.33%). Track it; it rarely justifies an emergency change on its own.
Description
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.
- CVSS 4.0
- 1.8 LOWCVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.33% probability · 26th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-347
- Affected
- amazon/aws cloud development kit
- Source
- security-advisories@github.com
References
- https://docs.aws.amazon.com/cdk/v2/guide/featureflags.html
- https://github.com/aws/aws-cdk/blob/d16482fc8a4a3e1f62751f481b770c09034df7d2/packages/%40aws-cdk/custom-resource-handlers/lib/aws-iam/oidc-handler/external.ts#L34Product
- https://github.com/aws/aws-cdk/commit/3e4f3773bfa48b75bf0adc7d53d46bbec7714a9e#diff-38a03353f201fd2e520df67fb43f9f000257bffd6e9acaa5569cce7005a77560
- https://github.com/aws/aws-cdk/issues/32920Issue Tracking
- https://github.com/aws/aws-cdk/pull/32921
- https://github.com/aws/aws-cdk/releases/tag/v2.177.0
- https://github.com/aws/aws-cdk/security/advisories/GHSA-v4mq-x674-ff73Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.