Merge PR #5016 from @saakovv - Add New AWS Lambda Function URL Configuration Created

new: New AWS Lambda Function URL Configuration Created

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Co-authored-by: Ivan.Saakov <[email protected]>
Co-authored-by: frack113 <[email protected]>
Co-authored-by: Nasreddine Bencherchali <[email protected]>

Author: 4 people

rules/cloud/aws/cloudtrail/aws_lambda_function_url.yml

@@ -0,0 +1,27 @@
+title: New AWS Lambda Function URL Configuration Created
+id: ec541962-c05a-4420-b9ea-84de072d18f4
+status: experimental
+description: |
+    Detects when a user creates a Lambda function URL configuration, which could be used to expose the function to the internet and potentially allow unauthorized access to the function's IAM role for AWS API calls.
+    This could give an adversary access to the privileges associated with the Lambda service role that is attached to that function.
+references:
+    - https://docs.aws.amazon.com/lambda/latest/dg/API_CreateFunctionUrlConfig.html
+    - https://cloud.hacktricks.xyz/pentesting-cloud/aws-security/aws-privilege-escalation/aws-lambda-privesc
+    - https://www.wiz.io/blog/how-to-set-secure-defaults-on-aws
+author: Ivan Saakov
+date: 2024-12-19
+tags:
+    - attack.initial-access
+    - attack.privilege-escalation
+logsource:
+    product: aws
+    service: cloudtrail
+detection:
+    selection:
+        eventSource: lambda.amazonaws.com
+        eventName: 'CreateFunctionUrlConfig'
+    condition: selection
+falsepositives:
+    - Creating a Lambda function URL configuration may be performed by a system administrator. Verify whether the user identity, user agent, and/or hostname should be making changes in your environment.
+    - Creating a Lambda function URL configuration from unfamiliar users should be investigated. If known behavior is causing false positives, it can be exempted from the rule.
+level: medium