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hacktricks/pentesting/pentesting-web/nginx.md

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Nginx

Alias LFI Misconfiguration

Inside the Nginx configuration look the "location" statements, if someone looks like:

location /imgs { 
    alias /path/images/ 
}

There is a LFI vulnerability because:

/imgs../flag.txt

Transforms to:

/path/images/../flag.txt

The correct configuration will be:

location /imgs/ { 
    alias /path/images/ 
}

So, if you find some Nginx server you should check for this vulnerability. Also, you can discover it if you find that the files/directories brute force is behaving weird.

More info: https://www.acunetix.com/vulnerabilities/web/path-traversal-via-misconfigured-nginx-alias/

Accunetix tests:

alias../ => HTTP status code 403
alias.../ => HTTP status code 404
alias../../ => HTTP status code 403
alias../../../../../../../../../../../ => HTTP status code 400
alias../ => HTTP status code 403

Static Analyzer tools

GIXY

Gixy is a tool to analyze Nginx configuration. The main goal of Gixy is to prevent security misconfiguration and automate flaw detection.