CloudFrunt is a tool for identifying misconfigured CloudFront domains. CloudFront is a Content Delivery Network (CDN) gave by Amazon Web Services (AWS). CloudFront clients make “distributions” that serve content from particular sources (an S3 container, for instance).

Each CloudFront distribution has a remarkable endpoint for clients to point their DNS records to (ex. d111111abcdef8.cloudfront.net). The greater part of the areas utilizing a particular distribution should be recorded in the “Alternate Domain Names (CNAMEs)” field in the choices for that distribution.

At the point when a CloudFront endpoint gets a demand, it doesn’t consequently serve content from the relating distribution. Rather, CloudFront utilizes the HOST header of the demand to figure out which distribution to utilize. This implies two things:

  • In the event that the HOST header does not coordinate a entry in the “Alternate Domain Names (CNAMEs)” field of the proposed circulation, the demand will come up short.
  • Whatever other distribution that contains the particular area in the HOST header will get the demand and react to it regularly.

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This is the thing that enables the spaces to be hijacked. There are numerous situations where a CloudFront client neglects to list all the essential areas that may be gotten in the HOST header. For instance:

  • The domain “test.disloops.com” is a CNAME record that focuses to “disloops.com”.
  • The “disloops.com” area is set up to utilize a CloudFront distribution.
  • Since “test.disloops.com” was not added to the “Alternate Domain Names (CNAMEs)” field for the distribution, solicitations to “test.disloops.com” will fall fail.
  • Another client can make a CloudFront distribution and include “test.disloops.com” to the “Alternate Domain Names (CNAMEs)” field to hijack the domain.

This implies the remarkable endpoint that CloudFront binds to a solitary circulation is viably good for nothing. An ask for to one particular CloudFront subdomain isn’t restricted to the distribution it is related with.

Installation CloudFrunt

$ git clone --recursive https://github.com/MindPointGroup/cloudfrunt
$ pip install -r requirements.txt

CloudFrunt expects the dnsrecon script to be cloned into a subdirectory called dnsrecon.

Usage

cloudfrunt.py [-h] [-l TARGET_FILE] [-d DOMAINS] [-o ORIGIN] [-i ORIGIN_ID] [-s] [-N]

-h, --help                      Show this message and exit
-s, --save                      Save the results to results.txt
-N, --no-dns                    Do not use dnsrecon to expand scope
-l, --target-file TARGET_FILE   File containing a list of domains (one per line)
-d, --domains DOMAINS           Comma-separated list of domains to scan
-o, --origin ORIGIN             Add vulnerable domains to new distributions with this origin
-i, --origin-id ORIGIN_ID       The origin ID to use with new distributions

Example

$ python cloudfrunt.py -o cloudfrunt.com.s3-website-us-east-1.amazonaws.com -i S3-cloudfrunt -l list.txt

 CloudFrunt v1.0.4

 [+] Enumerating DNS entries for google.com
 [-] No issues found for google.com

 [+] Enumerating DNS entries for disloops.com
 [+] Found CloudFront domain --> cdn.disloops.com
 [+] Found CloudFront domain --> test.disloops.com
 [-] Potentially misconfigured CloudFront domains:
 [#] --> test.disloops.com
 [+] Created new CloudFront distribution EXBC12DE3F45G
 [+] Added test.disloops.com to CloudFront distribution EXBC12DE3F45G

 

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