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CVE-2025-23206— IAM OIDC custom resource allows connection to unauthorized OIDC provider in aws-cdk

Quick assessment

Affected
aws aws-cdk
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

AWS Cloud Development Kit是Amazon Web Services开源的一个开源软件开发框架，用于在代码中定义云基础设施并通过 AWS CloudFormation 进行配置。 AWS Cloud Development Kit存在数据伪造问题漏洞，该漏洞源于在默认参数情况下不会验证对端的SSL/TLS证书是否有效。

AI Predicted 2.6 Difficulty: Theoretical EPSS 0.33% · P24
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I. Basic Information for CVE-2025-23206

Vulnerability Information
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Vulnerability Title
IAM OIDC custom resource allows connection to unauthorized OIDC provider in aws-cdk
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
AWS Cloud Development Kit 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
AWS Cloud Development Kit是Amazon Web Services开源的一个开源软件开发框架，用于在代码中定义云基础设施并通过 AWS CloudFormation 进行配置。 AWS Cloud Development Kit存在数据伪造问题漏洞，该漏洞源于在默认参数情况下不会验证对端的SSL/TLS证书是否有效。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
aws aws-cdk < 2.177.0 -

II. Public POCs for CVE-2025-23206

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III. Intelligence Information for CVE-2025-23206

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Patches & Fixes for CVE-2025-23206 (1)

IV. Related Vulnerabilities

Same product: aws-cdk
Same vendor: aws
Same weakness: CWE-347

V. Comments for CVE-2025-23206

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