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+# flAWS
+
+flAWS is a CTF focused for teaching about AWS (Amazon Web Services) pentesting, which introduces issues in AWS and to exploit them, it's hosted on `http://flaws.cloud/` so we don't need to setup anything for AWS
+
+
+
+## Level 1
+
+### This level is buckets of fun. See if you can find the first sub-domain
+
+Using the url which is given to us, we can check the response of the url with `curl`
+
+
+
+Here it shows `AmazonS3` in server header in the response, `Level 1` is about finding the subdomain of the domain given from where we can access S3, which is a key-value store, for storing objects in amazon which is used for storing files, these objects are stored in a container known as `buckets`
+
+The url of s3 bucket is in these formats
+
+- http://s3.amazonaws.com/bucket
+- http://bucket.s3.amazonaws.com
+
+
+
+As from the server response eariler, the site is being hosted as s3 bucket, so visiting `http://flaws.cloud.s3.amazonaws.com/` will show us the bucket, and the reaons why it will show us the contents is because it's allowed for un-authorized access
+
+
+
+This shows five html files
+- hint1.html
+- hint2.html
+- hint3.html
+- index.html
+- secret-dd02c7c.html
+
+Having `secret-dd02c7c.html` , we don't really need to go through the hint files as we already have found about s3 and have the secret file
+
+
+
+We can also access the bucket through command line as well using `aws-cli`
+
+
+
+
+
+If you encounter this error, it can be resolved by installing urlib version `1.26.7 `
+
+
+
+
+
+To list the contents from s3 bucket the syntax is like this also we are using `--no-sign-request` because we don't want any authentication and the region is where the bucket is being hosted from
+```bash
+aws s3 ls s3://flaws.cloud/ --no-sign-request --region us-west-2
+```
+
+
+
+We can download the secret file like this
+
+```bash
+aws s3 cp s3://flaws.cloud/hint1.html --no-sign-request --region us-west-2 .
+```
+
+
+
+Or if we want we can use `cp` and `--recursive` to download all files from the bucket on to our local machine
+
+```bash
+aws s3 cp s3://flaws.cloud/ --no-sign-request --region us-west-2 . --recursive
+```
+
+
+
+## Level 2
+
+### Accessing a bucket with any valid AWS credential
+
+
+
+There can be a mis-configuation in buckets to allow anyone to view bucket with any valid AWS credential, so if we try accessing this bucket `http://level2-c8b217a33fcf1f839f6f1f73a00a9ae7.flaws.cloud.s3.amazonaws.com/` it will give access denied to bucket with un-authorized access
+
+
+
+For this we need to now create an aws free tier account which needs credit card information
+
+
+
+After filling up the details we'll have the account registered, login as a root user account
+
+
+
+After logging in, we'll be brought to aws dashboard
+
+
+
+Now we need to setup AWS access key, to do that visit `Security Credentials`
+
+
+
+
+
+After closing this pop up, it will make the key active
+
+
+
+We can set the AWS key with `aws configure`
+
+
+
+These keys are saved in `~/.aws/credentials
+`
+
+
+And now we can acess the level 2 bucket
+
+
+
+Download the secret html file
+
+
+
+This will lead us to level 3
+
+
+
+## Level 3
+
+### Finding and acessing the bucket with authorized AWS key
+
+
+
+Let's access the bucket by going to this url `http://level3-9afd3927f195e10225021a578e6f78df.flaws.cloud.s3.amazonaws.com/`
+
+
+
+This gives us unauthorize access to bucket having a git repo, we can download all files through `--recursive`
+
+```bash
+aws s3 cp s3://level3-9afd3927f195e10225021a578e6f78df.flaws.cloud/ --region us-west-2 . --recursive
+```
+
+
+Using `git show` in `.git` directory we can see the commit which was deleted having the AWS access key
+
+
+
+
+With `aws s3 ls` we can list all the buckets but they are not accessible with this key
+
+
+## Level 4
+
+### Accessing EC2 instance
+
+
+
+We are given a url which is running a web site hosted from ec2 instance `http://4d0cf09b9b2d761a7d87be99d17507bce8b86f3b.flaws.cloud`
+
+We can't access the bucket without an authorized AWS key
+
+
+
+An ec2 instance is a virtual server on aws, you can think of it as a linux server but being hosted and using aws infrastructre
+
+
+
+This level mentions about a backup of ec2 instance was made
+
+ >It'll be useful to know that a snapshot was made of that EC2 shortly after nginx was setup on it.
+
+We can list the ec2 instances snapshots but before that we need the id and we can get that with
+
+```bash
+aws sts get-caller-identity --output text
+```
+
+
+
+To list the ec2 snapshots
+
+```bash
+aws ec2 describe-snapshots --owner-id 975426262029 --output text --region us-west-2
+```
+
+
+
+But form the output we can't understand it properly so instead we can just output it with json format
+
+
+
+Also to note that the reason we are specifying the `--owner-id` is because we want the snaphost which is owned by this AWS key, if we don't sepcfiy the id it will list all the snapshots which isn't owned by this user or id
+
+
+
+To mount this, we need to create a volume of this snapshot to our AWS user account and to do that we need to again configure the AWS key but this time giving it a profile name so we can reference it
+
+
+
+
+
+```bash
+aws ec2 create-volume --profile arz --availability-zone us-west-2a --region us-west-2 --snapshot-id snap-0b49342abd1bdcb89
+```
+
+
+
+We can check the status of the volume if it has been created
+
+```bash
+aws ec2 describe-volumes --region us-west-2 --filters Name=volume-id,Values=vol-067022c1d15d83787 --profile arz
+```
+
+
+
+Now from AWS dashboard, go to `Services` -> `Compute` -> `EC2` -> `EBS` and `Volumes` there you'll see the volume created from the snapshot
+
+
+
+Go to `Instances` , make sure to edit network settings to create the instance in `us-west-2a`
+
+
+
+Create a key pair
+
+
+
+Then launch then instance
+
+
+
+
+Clicking on the instance, we can find the public IP and DNS
+
+
+
+Now simply just login with the private key (pem) which was downloaded after setting the key pair using the username `ec2-user` which is the default user ( you can change that if you want)
+
+
+
+
+Attach the volume to this instance
+
+
+
+
+
+Run `blkid` to see the device number and then mount it with `mount`
+
+
+
+
+This reveals the username `flaws` with password `nCP8xigdjpjyiXgJ7nJu7rw5Ro68iE8M`, with the credentials we can login to the nginx web page amd find the link to the next level
+
+
+
+## Level 5
+
+### Accessing buckets through HTTP proxy
+
+
+
+This EC2 instance is using nginx as a proxy
+
+`http://4d0cf09b9b2d761a7d87be99d17507bce8b86f3b.flaws.cloud/proxy/`
+
+If we make a request to `127.0.0.1` which should see the index page for the level5 page for completing level4
+
+
+
+Which means there's SSRF here through which can make a request to `169.254.169.254` which is a reserverd IP for EC2 meta data service known as `maigc IP`
+
+
+
+We want the `latest` meta data from where we'll get `identity-credentials` and the role name `flaws` having the AWS access key
+
+
+
+
+
+Having the access keys, we can configure them in the default profile
+
+
+
+But we won't be able to view the user id and the bucket becasuse it will need a token as from the error it tells that token is invalid
+
+
+
+The token can be added in `~/.aws/credentials`
+
+
+
+And now we'll be able to use the AWS access key with the token added
+
+
+
+
+
+In the bucket we see `ddcc78ff/` so we'll just download the files recusively
+
+
+
+Opening the index.html we'll get the page of the next challenge
+
+## Level 6
+
+### Enumerating AWS Policies
+
+
+
+
+
+We are given AWS access key , make sure to remove the previous token
+
+
+
+
+
+On Checkinng the bucket, we'll get an access denied error
+
+
+
+As the challenge is about policies , we can try playing with `iam` which is Identity and Acess Management
+
+
+```bash
+aws iam list-roles
+```
+
+
+
+```
+aws iam list-attached-user-policies --user-name "level6
+```
+``
+
+
+This user has Security Audit and api gateway policies attached, having api gateway policy we can see the function `Level6` in lambda, lambda is used for running application or some code as you can see here that in runtime it's showing `python2.7`
+
+
+
+We need to get the API id of Level6 function
+
+```bash
+aws lambda get-policy --function-name Level6
+```
+
+
+
+Through this id we can list the stage name with `get-stages`
+
+```bash
+aws apigateway get-stages --rest-api-id s33ppypa75
+```
+
+
+
+
+This makes the URL of the api
+
+```
+http://s33ppypa75.execute-api.us-west-2.amazonaws.com/Prod/level6
+```
+
+
+
+On visting this link will mark the finish of fLAWS challenge
+
+
+
+
+
+## References
+
+
+- https://docs.aws.amazon.com/AmazonS3/latest/userguide/UsingBucket.html
+- https://blog.cloudanix.com/a-complete-list-of-aws-s3-misconfigurations/
+- https://stackoverflow.com/questions/33791069/quick-way-to-get-aws-account-number-from-the-aws-cli-tools
+- https://pentestbook.six2dez.com/enumeration/cloud/aws
+- https://labs.nettitude.com/blog/how-to-exfiltrate-aws-ec2-data/
+- https://hacktricks.boitatech.com.br/pentesting-web/ssrf-server-side-request-forgery#abusing-ssrf-in-aws-environment
+