[FD] [CVE-2017-17744] Cross-Site Scripting (XSS) vulnerability in Custom Map WordPress Plugin

[<nicolas.buzy-debat@xxxxxxxxxx>]

Product: Custom Map WordPress Plugin - https://wordpress.org/plugins/custom-map/
Vendor: webdesi9
Tested version: 1.1
CVE ID: CVE-2017-17744

** CVE description **
A cross-site scripting (XSS) vulnerability in the custom-map plugin through 1.1 
for WordPress allows remote attackers to inject arbitrary web script or HTML 
via the map_id parameter to view/advancedsettings.php.

** Technical details **
In custom-map/view/advancedsettings.php:9, $_REQUEST['map_id'] is directly 
echoed back to user without proper sanitization.

Vulnerable code:
if(isset($_REQUEST['map_id']))
{
echo $map_id=$_REQUEST['map_id'];

https://plugins.trac.wordpress.org/browser/custom-map/trunk/view/advancedsettings.php#L9

** Proof of Concept **
http://<host>/wordpress/wp-admin/admin.php?page=custom_maps_advanced_settings&map_id=<script>alert(document.cookie);</script>

** Solution **
No fix available yet.

** Timeline **
13/10/2017: vendor contacted through webform; no reply
17/10/2017: vendor contacted through webform; no reply
31/10/2017: vendor contacted through support@xxxxxxxxxxxx; no reply
05/12/2017: vendor contacted through support@xxxxxxxxxxxx; no reply
19/12/2017: report published

** Credits **
Vulnerability discovered by Nicolas Buzy-Debat working at Orange Cyberdefense 
Singapore (CERT-LEXSI).

--
Best Regards,

Nicolas Buzy-Debat
Orange Cyberdefense Singapore (CERT-LEXSI)

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