Mastering AWS Offensive Security: Hands-On Cloud Hacking Techniques

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Introduction

Cloud security is a critical frontier in cybersecurity, with AWS being a prime target due to its widespread adoption. Offensive security in AWS involves ethical hacking techniques to identify and exploit vulnerabilities before malicious actors do. This article explores key AWS offensive security concepts, including access key extraction, session token manipulation, and VPC exploitation, based on real-world workshop methodologies.

Learning Objectives

  • Understand how to extract AWS access keys from CloudShell and Lambda.
  • Learn to manage temporary credentials using STS GetSessionToken and role chaining.
  • Exploit VPC peering to access private EC2 instances and retrieve flags.

1. Extracting AWS Access Keys from CloudShell

Verified Command:

curl -s http://169.254.169.254/latest/meta-data/iam/security-credentials/

Step-by-Step Guide:

  1. Access CloudShell – Launch AWS CloudShell from the AWS Management Console.
  2. Query Instance Metadata – Run the above command to retrieve IAM role details.
  3. Extract Temporary Credentials – Use the role name to fetch temporary keys: 
    curl http://169.254.169.254/latest/meta-data/iam/security-credentials/<ROLE_NAME>
  4. Use Keys for AWS CLI Access – Configure the AWS CLI with the extracted credentials.

Why This Works:

CloudShell runs on an EC2 instance with an attached IAM role. The instance metadata service exposes these credentials, which can be abused if permissions are misconfigured.

2. Extracting Access Keys from Lambda Functions

Verified Command (Python):

import os
import boto3

def lambda_handler(event, context):
access_key = os.environ.get('AWS_ACCESS_KEY_ID')
secret_key = os.environ.get('AWS_SECRET_ACCESS_KEY')
return {"AccessKey": access_key, "SecretKey": secret_key}

Step-by-Step Guide:

  1. Deploy a Lambda Function – Use the above code snippet in a new Lambda function.
  2. Trigger the Function – Execute it manually or via an event.
  3. Retrieve Credentials – The function outputs any hardcoded or environment-based AWS keys.

Why This Works:

Lambda functions sometimes store credentials in environment variables, which can be leaked if the function is improperly secured.

3. Using STS GetSessionToken for Temporary Credentials

Verified AWS CLI Command:

aws sts get-session-token --duration-seconds 900

Step-by-Step Guide:

  1. Request Session Token – Run the command to generate temporary credentials.
  2. Set Environment Variables – Export the new credentials: 
    export AWS_ACCESS_KEY_ID=<NewAccessKey>
export AWS_SECRET_ACCESS_KEY=<NewSecretKey>
export AWS_SESSION_TOKEN=<SessionToken>
  3. Verify Access – Use `aws sts get-caller-identity` to confirm the session.

Why This Works:

Temporary credentials reduce long-term exposure but must be managed carefully to avoid privilege escalation.

4. Role Chaining for Privilege Escalation

Verified AWS CLI Command:

aws sts assume-role --role-arn <TargetRoleARN> --role-session-name "ExploitSession"

Step-by-Step Guide:

  1. Identify Target Role ARN – Find a role with higher privileges.
  2. Assume the Role – Execute the command to obtain new credentials.
  3. Use Elevated Permissions – Configure the CLI with the assumed role’s credentials.

Why This Works:

Misconfigured trust policies allow attackers to chain role assumptions, escalating privileges.

  1. Exploiting VPC Peering to Access Private EC2 Instances

Verified AWS CLI Command:

aws ec2 create-vpc-peering-connection --vpc-id <YourVPC> --peer-vpc-id <TargetVPC>

Step-by-Step Guide:

  1. Initiate VPC Peering – Request a connection between your VPC and the target.
  2. Accept the Peering Request (if auto-approved, skip this step).
  3. Modify Route Tables – Add routes to direct traffic between peered VPCs.
  4. Access Private EC2 – Use SSH or HTTP to interact with the internal instance.

Why This Works:

Improperly restricted VPC peering can expose private resources to unauthorized access.

What Undercode Say:

  • Key Takeaway 1: AWS credentials are frequently exposed via metadata services, environment variables, or misconfigured roles.
  • Key Takeaway 2: Temporary credentials (STS) require strict time limits to prevent misuse.
  • Key Takeaway 3: VPC peering is a powerful feature but can become a security risk if not properly audited.

Analysis:

AWS offensive security is evolving rapidly, with new exploitation techniques emerging as AWS introduces security patches. Ethical hackers must stay updated on the latest research, as cloud environments are highly dynamic. Hands-on labs, like those in this workshop, are essential for mastering real-world attack scenarios.

Prediction:

As cloud adoption grows, AWS offensive security will become a standard skill for red teams. Automated tools for cloud exploitation will emerge, but manual techniques will remain critical for advanced attacks. Companies investing in cloud security training today will have a significant defensive advantage in the coming years.

IT/Security Reporter URL:

Reported By: Activity 7341777265816436736 – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

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