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Burp Extender

Burp Extender lets you extend the functionality of Burp Suite in numerous ways.

Extensions can be written in Java, Python or Ruby.

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  3. NGINX Alias Traversal

NGINX Alias Traversal

This extension detects NGINX alias traversal due to misconfiguration.

The technique is based on Orange Tsai's BlackHat USA 2018 Presentation

A server is assumed to be vulnerable if a request to an existing path like `` returns 403. To eliminate false positives the misconfiguration has to be confirmed by successfully requesting an existing resource via path traversal. This is done as follows:

For the URL it generates the following links:

Where `%s` are common directories used in alias paths based on around 9500 nginx configuration files from GH (thanks @TomNomNom), see directories.txt.

Author Martin Bajaník
Version 1.0
Last updated 20 November 2018

You can install BApps directly within Burp, via the BApp Store feature in the Burp Extender tool. You can also download them from here, for offline installation into Burp.

You can view the source code for this BApp by visiting our GitHub page.
Follow @BApp_Store on Twitter to receive notifications of all BApp releases and updates.
Download BApp

Please note that extensions are written by third party users of Burp, and PortSwigger Web Security makes no warranty about their quality or usefulness for any particular purpose.

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