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WordPress Activity Log 2.3.2 Cross Site Scripting

WordPress Activity Log 2.3.2 Cross Site Scripting
Posted Aug 3, 2016
Authored by Securify B.V., Edwin Molenaar

WordPress Activity Log plugin version 2.3.2 suffers from a cross site scripting vulnerability in the search function.

tags | exploit, xss
SHA-256 | b130c22a63ee88f3818d8ab594345285ddd886cffa1bcc2edf0d11d982863e18

WordPress Activity Log 2.3.2 Cross Site Scripting

Change Mirror Download
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Cross-Site Scripting vulnerability in search function Activity Log
WordPress Plugin
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Edwin Molenaar, July 2016

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

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OVE ID
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OVE-20160718-0002

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Tested versions
------------------------------------------------------------------------
This issue was successfully tested on Activity Log WordPress Plugin
version 2.3.2.

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Fix
------------------------------------------------------------------------
This issue is fixed in Activity Log version 2.3.3

------------------------------------------------------------------------
Details
------------------------------------------------------------------------
https://sumofpwn.nl/advisory/2016/cross_site_scripting_vulnerability_in_search_function_activity_log_wordpress_plugin.html

The vulnerability exists in improper filtering of the search input parameter $search_data in the file aryo-activity-log/classes/class-aal-activity-log-list-table.php at line 483. The WordPress sanitize_text_field sanitizer is used, but this still allows us to use spaces, " and () to craft a Cross-Site Scripting payload.

public function search_box( $text, $input_id ) {

$search_data = isset( $_REQUEST['s'] ) ? sanitize_text_field( $_REQUEST['s'] ) : '';

$input_id = $input_id . '-search-input';
?>
<p class="search-box">
<label class="screen-reader-text" for="<?php echo $input_id ?>"><?php echo $text; ?>:</label>
<input type="search" id="<?php echo $input_id ?>" name="s" value="<?php echo $search_data; ?>" />
<?php submit_button( $text, 'button', false, false, array('id' => 'search-submit') ); ?>
</p>

When a search on the activity log is preformed, a CSRF token is added to the URL, however it is not checked. Consequently, it can be exploited by luring the target user into clicking a specially crafted link or visiting a malicious website (or advertisement).
Proof of concept

http://<target>/wp-admin/admin.php?page=activity_log_page&s=111"+onfocus=alert(document.domain)+"+autofocus="&paged=1


------------------------------------------------------------------------
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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