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Apr 3, 2025
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Add section on lambda credential theft #174

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6 changes: 6 additions & 0 deletions ...cloud/aws-security/aws-post-exploitation/aws-lambda-post-exploitation/README.md
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Expand Up @@ -10,6 +10,12 @@ For more information check:
../../aws-services/aws-lambda-enum.md
{{#endref}}

### Exfilrtate Lambda Credentials

Lambda uses environment variables to inject credentials at runtime. If you can get access to them (by reading `/proc/self/environ` or using the vulnerable function itself), you can use them yourself. They live in the default variable names `AWS_SESSION_TOKEN`, `AWS_SECRET_ACCESS_KEY`, and `AWS_ACCESS_KEY_ID`.

By default, these will have access to write to a cloudwatch log group (the name of which is stored in `AWS_LAMBDA_LOG_GROUP_NAME`), as well as to create arbitrary log groups, however lambda functions frequently have more permissions assigned based on their intended use.

### Steal Others Lambda URL Requests

If an attacker somehow manage to get RCE inside a Lambda he will be able to steal other users HTTP requests to the lambda. If the requests contain sensitive information (cookies, credentials...) he will be able to steal them.
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