s3recon

Amazon S3 bucket finder and crawler.

Check out the s3recon docs

Installation

NOTE: s3recon requires python version >=3.6

$ pip install s3recon

Usage

usage: s3recon [-h] [-o file] [-d] [-p] [-t seconds] [-v] [-c num] word_list [word_list ...]

positional arguments:
  word_list                      read words from one or more <word-list> files

optional arguments:
  -h, --help                     show this help message and exit
  -o file, --output file         write output to <file>
  -d, --db                       write output to database
  -p, --public                   only include 'public' buckets in the output
  -t seconds, --timeout seconds  http request timeout in <seconds> (default: 30)
  -v, --version                  show program's version number and exit
  -c num, --concurrency num      maximum <num> of concurrent requests (default: # of lcpus)
  

Example 1: Output to a json file

1. Download a word-list.

The SecLists repository has a multitude of word-lists to choose from. For this example, let's download the sample word-list included in this repository.

$ curl -sSfL -o "word-list.txt" "https://raw.githubusercontent.com/clarketm/s3recon/master/data/words.txt"

2. Run s3recon.

Execute s3recon using the word-list.txt file and output the public S3 buckets to a json file named results.json.

$ s3recon "word-list.txt" -o "results.json" --public

- PRIVATE https://s3.sa-east-1.amazonaws.com/test-lyft
- PRIVATE https://s3.ap-south-1.amazonaws.com/test.amazon
+ PUBLIC https://walmart-dev.s3.us-east-1.amazonaws.com
- PRIVATE https://s3.ap-southeast-1.amazonaws.com/apple-prod
- PRIVATE https://walmart.s3.ap-southeast-1.amazonaws.com
...

3. Inspect the results.

Check the results.json output file to view the S3 buckets you have discovered!

$ cat "results.json"

{
    "public": {
        "total": 12,
        "hits": [
            "https://walmart-dev.s3.us-east-1.amazonaws.com",
            "https://apple-production.s3.ap-southeast-1.amazonaws.com",
            ...
        ]
    }
}

Note: to include private buckets in the results omit the -p, --public flag from the command.

4. Crawl the results.

Enumerate the static files located in each bucket and record the findings.

Coming soon!

Example 2: Output to a MongoDB database

1. Download a word-list.

The SecLists repository has a multitude of word-lists to choose from. For this example, let's download the sample word-list included in this repository.

$ curl -sSfL -o "word-list.txt" "https://raw.githubusercontent.com/clarketm/s3recon/master/data/words.txt"

2. Start an instance of MongoDB

$ docker run --name "mongo" -p 27017:27017 -v "mongodb_data:/data/db" -v "mongodb_config:/data/configdb" -d mongo

3. Run s3recon.

Execute s3recon using the word-list.txt file and output to MongoDB instance.

$ s3recon "word-list.txt" --db

- PRIVATE https://s3.sa-east-1.amazonaws.com/test-lyft
- PRIVATE https://s3.ap-south-1.amazonaws.com/test.amazon
+ PUBLIC https://walmart-dev.s3.us-east-1.amazonaws.com
- PRIVATE https://s3.ap-southeast-1.amazonaws.com/apple-prod
- PRIVATE https://walmart.s3.ap-southeast-1.amazonaws.com
...

3. Inspect the results.

Check the MongoDB database: s3recon collection: hits to view the S3 buckets you have discovered!

$ mongo "s3recon" --quiet --eval 'db.hits.find({}, {"url": 1, "access": 1, "_id": 0}).limit(5)'

{ "url" : "https://s3.us-east-2.amazonaws.com/apple", "access" : "private" }
{ "url" : "https://s3.us-west-1.amazonaws.com/microsoft-dev", "access" : "private" }
{ "url" : "https://s3.us-west-1.amazonaws.com/dev-microsoft", "access" : "private" }
{ "url" : "https://s3.us-east-2.amazonaws.com/amazon", "access" : "private" }
{ "url" : "https://s3.us-east-1.amazonaws.com/dev-amazon", "access" : "private" }

4. Crawl the results.

Enumerate the static files located in each bucket and record the findings.

Coming soon!

FAQ

Q: How do I configure this utility?

A:

s3recon can be configure using a yaml configuration file located in either the current working directory (e.g. ./s3recon.yml) or your home diretory (e.g. ~/s3recon.yml).

The following is the list of configurable values:

# s3recon.yml

database: { host: "0.0.0.0", ... }
  
separators: ["-", "_", "."]

environments: ["", "backup", "backups", ...]

regions: ["ap-northeast-1", "ap-northeast-2", ...]

To see the full list of configurable values (and their defaults) please refer to the s3recon.yml file in this repository.

Q: How do I customize the AWS regions used in the recon?

A:

The AWS regions can be altered by setting the regions array in your s3recon.yml configuration file.

# s3recon.yml

regions: [ "us-west-2", ...]

Q: How do I customize the environment values used in the recon?

A:

The environments are modifiers permuted with each item of the word-list (and the separator) to construct the bucket value in request. The value can be altered by setting the environments array in your s3recon.yml configuration file.

For example, to only search lines from the word-list verbatim (i.e. without modification) you can set this value to an empty array.

# s3recon.yml

environments: []

Q: How do I customize the MongoDB host and port?

A:

The database host and port can be configured by altering the database map in your s3recon.yml configuration file.

For example, host and port can be set directly inside the database map

# s3recon.yml

database: {
  host: "0.0.0.0",
  port: 27017
}

Q: How do I use a database other than MongoDB?

A:

Sorry, at the moment only MongoDB is supported.

Going Forward

• Create crawl command to crawl public/private buckets found in find stage.
• Separate out find and crawl as subcommands.
• Store discovered buckets in a NoSQL database.

Disclaimer

This tools is distributed for educational and security purposes. I take no responsibility and assume no liability for the manner in which this tool is used.

License

MIT © Travis Clarke