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Qu’est-ce qu’une attaque DDoS ?

June 6, 2023
in Tech News
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Une attaque par déni de service distribué, ou DDoS, est le nom que l’on donne à une approach d’attaque informatique. Elle vise à envoyer de nombreuses requêtes sur un service (un website net, une software) depuis plusieurs machines afin d’en perturber le bon fonctionnement. Une menace pour la cybersécurité aux multiples usages. Voici tout ce qu’il faut savoir sur les attaques DDoS.

Qu'est ce qu'une attaque DDOS

Avec le malware, le ransomware et le phishing, l’attaque DDoS fait partie des menaces les plus répandues sur Internet. Relativement easy à mettre en place, elle est utilisée aussi bien par des hackers en herbe que par des pirates expérimentés, des organisations criminelles, des collectifs politiques et même certains gouvernements.

Extorsion de fonds, paralysie d’un service, sabotage intentionnel, cyberharcèlement, les usages d’une attaque DDoS sont nombreux. Voici tout ce qu’il faut savoir sur cette attaque informatique malveillante.

Une attaque DDoS (Attaque par déni de service), qu’est-ce que c’est ?

Une attaque par déni de service (DoS pour Denial of Service) consiste à inonder de données la bande passante ou l’infrastructure réseau d’un service, comme un website Web, une software, un réseau informatique ou même un distinctive ordinateur. Le however est d’en altérer le bon fonctionnement, de le saturer de requêtes, au level de le rendre inaccessible.

Le plus souvent, ce kind d’attaque est mené depuis plusieurs machines, afin de multiplier le nombre de requêtes. On parle alors d’attaque collective par saturation de service, ou plus communément d’attaque par déni de service distribué. D’où l’acronyme DDoS, pour Distributed Denial of Service.

Comment fonctionne une attaque DDoS ?

Pour préparer une attaque DDoS, le pirate corrompt une série de machines connectées en les infectant avec un ou plusieurs malware. Lorsqu’une attaque DDoS est lancée, le réseau de machines infectées envoie un nombre très élevé de requêtes vers un seul et même service. Celui-ci est alors noyé sous les requêtes, des paquets de données, ce qui paralyse le ou les serveurs qui sont incapables de traiter le trafic classique. Il s’agit ici d’une attaque “volumétrique”.

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Attaque DDOS

Une attaque DDoS peut aussi cibler le réseau directement, pour empêcher une personne spécifique d’accéder à un service par exemple. L’attaque dite Syn Flood vise ainsi le protocole TCP, qui se cost d’assurer la connexion entre un système (consumer) et un service (serveur). Le fonctionnement de ce protocole TCP est easy : dans un premier temps, le consumer génère un message SYN vers le serveur qu’il vise. Ce dernier lui répond avec un message SYN-ACK. L’échange se conclut par un message ACK du consumer afin d’établir définitivement la connexion.

L’attaque, elle, intervient dans cet échange. Elle bombarde le serveur de requêtes SYN, occupant ainsi tous les ports d’entrée dudit serveur. Aucune autre connexion ne peut donc avoir lieu, empêchant le consumer d’accéder au service.

Parmi les autres varieties d’attaques DDoS, on trouve l’UDP Flooding (qui sature la bande passante entre deux machines), le Packet Fragment (qui vise la défragmentation au niveau IP pour faire crasher une machine) ou encore l’attaque DDoS de couche 7 (qui cible et perturbe des purposes Web spécifiques et non un réseau entier).

Qui fait des DDoS et à quoi ça sert ?

Grâce à la facilité de sa mise en place, l’attaque DDoS est très populaire auprès des hackers malveillants. À commencer par les organisations criminelles, qui utilisent les attaques DDoS contre des entreprises dont l’activité commerciale passe par le Web. Un chantage financier est lancé contre la promesse de ne pas paralyser les providers Internet.

Une entreprise peut également se servir d’une attaque DDoS pour brider l’activité d’une entité concurrente, et par conséquent, la couler financièrement.

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L’attaque DDoS sert parfois de leurre à une autre attaque d’envergure, comme l’set up d’un ransomware ou le pillage de données privées.

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On retrouve aussi les attaques DDoS dans des actions politiques. Les « hacktivistes » peuvent s’appuyer sur l’attaque DDoS pour « punir » une grosse multinationale par exemple, rendre inaccessible un service d’état ou couper les canaux de communication d’un groupe adversarial.

Enfin, certains pays font utilization de l’attaque DDoS pour entraver les providers d’un autre pays, et ainsi déstabiliser l’motion du gouvernement ciblé. Aux premières heures de la guerre en Ukraine, la Russie a été accusée d’avoir lancé de nombreuses attaques DDoS contre les providers administratifs et bancaires ukrainiens.

Comment se protéger d’une attaque DDoS ?

Par définition, il est difficile de contrer une attaque DDoS en cours. Celle-ci envoyant une multitude de requêtes depuis de nombreuses machines aux adresses différentes, il est presque unimaginable de bloquer toutes les adresses IP. L’attaque est au mieux limitée, mais reste ininterrompue.

En revanche, il est tout à fait potential de se prémunir contre une attaque DDoS. Certaines entreprises, comme Cloudflare, proposent des « serveurs tampons » pour dévier les attaques. Concrètement, il s’agit de rediriger les requêtes vers un serveur vide, qui épuisera l’attaque afin de protéger le serveur visé de la surcharge.


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