Vulnerability · Published Jan 17, 2025 · Assigned by GitHub_M
CVE-2025-23206IAM OIDC custom resource allows connection to unauthorized OIDC provider in aws-cdk
Low 1.8
In plain English
A low-severity security flaw in aws-cdk from aws. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | aws-cdk-lib | 2.177.0 | GHSA-v4mq-x674-ff73 |
Affected products (as reported)
Weakness: CWE-347 · Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
References
- https://github.com/aws/aws-cdk/security/advisories/GHSA-v4mq-x674-ff73 x_refsource_CONFIRM
- https://github.com/aws/aws-cdk/issues/32920 x_refsource_MISC
- https://github.com/aws/aws-cdk/pull/32921 x_refsource_MISC
- https://github.com/aws/aws-cdk/commit/3e4f3773bfa48b75bf0adc7d53d46bbec7714a9e#diff-38a03353f201fd2e520df67fb43f9f000257bffd6e9acaa5569cce7005a77560 x_refsource_MISC
- https://docs.aws.amazon.com/cdk/v2/guide/featureflags.html x_refsource_MISC
- https://github.com/aws/aws-cdk/blob/d16482fc8a4a3e1f62751f481b770c09034df7d2/packages/%40aws-cdk/custom-resource-handlers/lib/aws-iam/oidc-handler/external.ts#L34 x_refsource_MISC
- https://github.com/aws/aws-cdk/releases/tag/v2.177.0 x_refsource_MISC