Description

This tool exploits XXE to retrieve files from a target server. It obtains directory listings and recursively downloads file contents.

Usage:

The script has to be slightly modified to work with different web sites / web services:

• Set HOST and URL according to your target
• Change the XML data and the URL of your evil.dtd in the REQUEST_BODY
• Modify the _parse_response() method to parse the file content from the response.
• For https: Change the _issue_request method to use HTTPSConnection.

Also, make sure you make the DTD evil.dtd available to the server: python -m SimpleHTTPServer 5678

python xxeclient.py -h
usage: xxeclient.py [-h] path [path ...]

Retrieves files via XXE

positional arguments:
  path        path(s) to the retrieve (e.g. /etc/)

optional arguments:
  -h, --help  show this help message and exit

Vulnerable Example Web Service

The files in xxe-example/ contain a sample vulnerable RESTful web service written in Java using Jersey (inspired by [1]).

To compile and run it using maven run: mvn jetty:run

Debugging:

The JSON and XML files in sample-payloads/ can be used to debug the web service with curl:

curl -v -H "Content-Type:application/json" --upload-file initial.json http://localhost:8080/api/user
curl -v -H "Content-Type:application/xml" --upload-file cdata.xml http://localhost:8080/api/user

[1] https://github.com/rgerganov/xxe-example