Add DOS - DDOS course
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content/secu_reseaux/3_DDOS/images/mirai.svg
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|
||||||
|
---
|
||||||
|
title: "Sécurité des réseaux : Déni de service"
|
||||||
|
date: 2022-09-27
|
||||||
|
tags: ["Mirai", "DDOS"]
|
||||||
|
categories: ["Sécurité des réseaux", "Cours"]
|
||||||
|
---
|
||||||
|
|
||||||
|
Pour l'attaquant, le principe est de rendre inopérant un service, le plus
|
||||||
|
souvent en l'innondant de requêtes.
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
Le schema ci-dessus montre comment un attaquant utilise une machine zombie pour
|
||||||
|
noyer une victime **A** sous un flots de `SYN/ACK` afin de saturer sa pile
|
||||||
|
réseau
|
||||||
|
|
||||||
|
## Les Botnets
|
||||||
|
|
||||||
|
Pierre angulaire des attaque par *déni de service distribués* (DDOS) les botnets
|
||||||
|
sont composés de plusieurs machines incectées (de quelques dizaines à plusieurs
|
||||||
|
millions) sous le contôle d'un attaquant. Les botnets son comparable à une
|
||||||
|
maladie : une machine infectée en infecte d'autres.
|
||||||
|
|
||||||
|
Un botnet est piloté depuis par un **centre de contrôle**.
|
||||||
|
|
||||||
|
La tendance actuelle est de créer des botnets à partir **d'objets connectés**.
|
||||||
|
em effet ce genre d'apparail **peu cher et limités en terme de sécurité** est
|
||||||
|
une victime idéale pour cet usage.
|
||||||
|
|
||||||
|
## Le cas Mirai
|
||||||
|
|
||||||
|
Les plus gros *botnets* sont des déscendants de Mirai. Il se focalise sur la
|
||||||
|
quantité et s'interesse avant tout aux objetx connectés en IPv4.
|
||||||
|
|
||||||
|
### Son fonctionnement
|
||||||
|
|
||||||
|
De base, il supporte une trentaine de modèles de caméras. Il contient une liste
|
||||||
|
d'identifiants utilisés par défaut sur ces appareils. Son code est le plus
|
||||||
|
simple possible afin de fonctionner correctement sur des **architectures
|
||||||
|
restreintes** (CPU limités, soucent simple cœur, peu de RAM)
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
Comme le montre le schema ci-dessus, *Mirai* est capable de **se propager** de
|
||||||
|
caméras en caméra.
|
||||||
|
|
||||||
|
## Se prémunir
|
||||||
|
|
||||||
|
Non-distribuées, les attaques par déni de services se contrent facilement: il
|
||||||
|
sufit de **bannir l'adresse IP attaquante**. Dans de cas de **DDOS**, les choses
|
||||||
|
sont plux complexe: la nature même de l'attaque a pour but de **la rendre
|
||||||
|
difficile à stopper**. Il est tout de même possible de passer par des serveurs
|
||||||
|
tampons qui *"nettoient"* le trafic
|
||||||
Loading…
Add table
Add a link
Reference in a new issue