October 2016
Intermediate to advanced
298 pages
5h 49m
English
Content preview from Mastering Modern Web Penetration TestingBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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XXE attack
An XXE attack is based on the concept of external entities in XML. We can utilize the URI portion of external entities to do nasty things such as reading files, exfiltration of data, server-side request forgery, or even executing arbitrary code.
Note
In some of the following examples I have purposely enabled a few features such as the external entity loader, URL fopen, and the expect module of PHP for the sake of demonstration. These come disabled in a default installation of PHP.
Keep in mind that an XXE attack affects other server-side scripting platforms such as JSP, ASP, and so on; so some features which are disabled in PHP by default may work out of the box on other platforms.
Consider the following XML parsing code in PHP:
<?php $xml ...
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