Google Web Toolkit

Google Web Toolkit (GWT), also known as GWT Web Toolkit, is an open-source set of tools that allows web developers to create and maintain JavaScript front-end applications using Java. It was originally developed by Google and had its initial release on May 16, 2006.

Summary

• Tools

• Methodology

• References

Tools

• FSecureLABS/GWTMap - GWTMap is a tool to help map the attack surface of Google Web Toolkit (GWT) based applications.

• GDSSecurity/GWT-Penetration-Testing-Toolset - A set of tools made to assist in penetration testing GWT applications.

Methodology

• Enumerate the methods of a remote application via it's bootstrap file and create a local backup of the code (selects permutation at random):

  ./gwtmap.py -u http://10.10.10.10/olympian/olympian.nocache.js --backup

• Enumerate the methods of a remote application via a specific code permutation

  ./gwtmap.py -u http://10.10.10.10/olympian/C39AB19B83398A76A21E0CD04EC9B14C.cache.js

• Enumerate the methods whilst routing traffic through an HTTP proxy:

  ./gwtmap.py -u http://10.10.10.10/olympian/olympian.nocache.js --backup -p http://127.0.0.1:8080

• Enumerate the methods of a local copy (a file) of any given permutation:

  ./gwtmap.py -F test_data/olympian/C39AB19B83398A76A21E0CD04EC9B14C.cache.js

• Filter output to a specific service or method:

  ./gwtmap.py -u http://10.10.10.10/olympian/olympian.nocache.js --filter AuthenticationService.login

• Generate RPC payloads for all methods of the filtered service, with coloured output

  ./gwtmap.py -u http://10.10.10.10/olympian/olympian.nocache.js --filter AuthenticationService --rpc --color

• Automatically test (probe) the generate RPC request for the filtered service method

  ./gwtmap.py -u http://10.10.10.10/olympian/olympian.nocache.js --filter AuthenticationService.login --rpc --probe
  ./gwtmap.py -u http://10.10.10.10/olympian/olympian.nocache.js --filter TestService.testDetails --rpc --probe

References

• From Serialized to Shell :: Exploiting Google Web Toolkit with EL Injection - Stevent Seeley - May 22, 2017

• Hacking a Google Web Toolkit application - thehackerish - April 22, 2021