full-disclosure - Re: [FD] Data Manipulation with X-Forwarded-For header at WordPress

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Message-ID: <f8c99282-3b09-dd02-f345-ac1f9ae75517@dustri.org>
Date: Fri, 12 Mar 2021 14:16:05 +0100
From: jvoisin <julien.voisin@...tri.org>
To: fulldisclosure@...lists.org
Subject: Re: [FD] Data Manipulation with X-Forwarded-For header at WordPress

> VI. DESCRIPTION
> -------------------------
> "X-Forwarded-For" is a HTTP header used to carry the client's original
> IP address. However, because these headers may very well be added by
> the client to the requests, if the systems/devices use IP addresses
> which decelerate at X-Forwarded-For header instead of original IP,
> various issues may be faced. If the data originating from these fields
> is trusted by the application developers and processed, any
> authorization checks originating IP address logging could be
> manipulated.
I'm not sure I understand what's going on here: The "vulnerability" is 
that "X-Forwarded-For" can be manipulated by the client?

> VII. PROOF OF CONCEPT
> -------------------------
> Affected Component: Wordpress core
> Affected version Wordpress 5.1
> 
> -Add X-Forwarded-For header to the /wp-admin
> -You will get an error about your IP
> -Next go /wp-admin/admin-ajax.php and add X-Forwarded-For header again
This doesn't make any sense.

There is nothing on Wordpress' website ( 
https://wordpress.org/news/category/security/ ) about an issue like this 
one, nor on the mitre's website ( 
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-35539 ).

Can you please elaborate on this issue?

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