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Smart XSS Fuzzer
Meetup OWASP
Fuzzer?
Différents
types de
fuzzers
A fuzzer can be categorized in several ways:
1. A fuzzer can be generation-based or
mutation-based depending on whether inputs are
generated from scratch or by modifying existing
inputs.
2. A fuzzer can be dumb or smart depending on
whether it is aware of input structure.
3. A fuzzer can be white-, grey-, or black-box,
depending on whether it is aware of program
structure.
https://en.wikipedia.org/wiki/Fuzzing#Types
Construisons un Smart XSS Fuzzer
Générateur de XSS
Construisons un Smart XSS Fuzzer
Générateur de XSS
“Apprend” ce qu’est
un payload XSS
Base de
connaissance
Payloads XSS
Construisons un Smart XSS Fuzzer
Générateur de XSS
Nouveaux
Payloads XSS
App
C’est quoi, cette boite?
Show me some code!
Construction du modèle:
Apprentissage:
Démo!
C’est magique?
- Transformer la base de connaissance en un “vecteur”
- Caractères?
- Blocs caractérisques? (script/alert/console.log/…)
- Taille de la base ⇒ Inférence (capacité à généraliser)
- Hyper-paramètres du modèle?
- Nombre d’apprentissage?
- Génération ⇒ “Temperature” : paramètre de choix
aléatoire
- Payload ok?
Références
- Code source:
https://github.com/cotonne/security/
tree/master/smart-xss-generator
- Natural Language Processing in
Action:
https://www.manning.com/books/na
tural-language-processing-in-action
- XSS Payload List:
https://github.com/ismailtasdelen/xs
s-payload-list
- LTSM (Recurrent Neural Network)
for Tweet Generation:
https://github.com/bcaine/TrumpBot

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Smart XSS fuzzer

  • 3. Différents types de fuzzers A fuzzer can be categorized in several ways: 1. A fuzzer can be generation-based or mutation-based depending on whether inputs are generated from scratch or by modifying existing inputs. 2. A fuzzer can be dumb or smart depending on whether it is aware of input structure. 3. A fuzzer can be white-, grey-, or black-box, depending on whether it is aware of program structure. https://en.wikipedia.org/wiki/Fuzzing#Types
  • 4. Construisons un Smart XSS Fuzzer Générateur de XSS
  • 5. Construisons un Smart XSS Fuzzer Générateur de XSS “Apprend” ce qu’est un payload XSS Base de connaissance Payloads XSS
  • 6. Construisons un Smart XSS Fuzzer Générateur de XSS Nouveaux Payloads XSS App
  • 8. Show me some code! Construction du modèle: Apprentissage:
  • 10. C’est magique? - Transformer la base de connaissance en un “vecteur” - Caractères? - Blocs caractérisques? (script/alert/console.log/…) - Taille de la base ⇒ Inférence (capacité à généraliser) - Hyper-paramètres du modèle? - Nombre d’apprentissage? - Génération ⇒ “Temperature” : paramètre de choix aléatoire - Payload ok?
  • 11. Références - Code source: https://github.com/cotonne/security/ tree/master/smart-xss-generator - Natural Language Processing in Action: https://www.manning.com/books/na tural-language-processing-in-action - XSS Payload List: https://github.com/ismailtasdelen/xs s-payload-list - LTSM (Recurrent Neural Network) for Tweet Generation: https://github.com/bcaine/TrumpBot