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xss-presentation's Introduction

Cross Site Scripting (XSS)


Security Lab und Juice Shop

juice shop

Quelle: http://bkimminich.github.io/juice-shop/#/


OWASP

  • Open Web Application Security Project
  • Top Ten der Sicherheitsprobleme
  • Ganz oben: XSS

XSS

  • Auf Webserver Schadcode platzieren
  • Zugriff der User über Browser
  • Ungefilterte Inhalte werden vom Webserver weitergereicht
  • Skripte werden ausgeführt

Quelle: Eckert, Claudia (2014): IT-Sicherheit. De Gruyter-Oldenbourg, München.


reflected XSS attack

reflected_xss

Demo: https://tinyurl.com/y8gt8rw7


persisted XSS attack

persisted_xss

  • Über externe Scripte (z.B. Google Tag Manager)
  • Datenbank (z.B. Feedback Formular)

Beef Framework

  • Kali Linux: Penetration Testing Distribution
  • BeEF Project: Browser Exploitation

beef beef panel

Quelle: https://picateshackz.com, https://funinformatique.com


Xenotics Framework

Xenotix

Quelle: http://www.owasp.org/index.php/OWASP_Xenotix_XSS_Exploit_Framework


<iframe src="http://www.youtube.com/embed/HnhLMYjOOtQ?version=3&loop=1&playlist=HnhLMYjOOtQ" allowfullscreen="" frameborder="0" height="480" width="853"></iframe>
<iframe src="http://www.youtube.com/embed/eGOQqnfMdmI?version=3&loop=1&playlist=eGOQqnfMdmI" allowfullscreen="" frameborder="0" height="480" width="853"></iframe>
<iframe src="http://www.youtube.com/embed/RvYjfavvf2E?version=3&loop=1&playlist=RvYjfavvf2E" allowfullscreen="" frameborder="0" height="480" width="853"></iframe>
<iframe src="http://www.youtube.com/embed/qqv4887uWBk?version=3&loop=1&playlist=qqv4887uWBk" allowfullscreen="" frameborder="0" height="480" width="853"></iframe>

Social Engineering

  • Nicht-technische Seite häufig nötig
  • User werden manipuliert über falsche Informationen
  • Aktives Zustimmen ermöglicht den Angriff
  • z.B. Kamera aktivieren, Persistent Browser Keylogger "Update installieren"

Quelle: Eckert, Claudia (2014): IT-Sicherheit. De Gruyter-Oldenbourg, München.


Fazit

  • Cross-site Scripting ist böse :-)
  • Webseiten müssen vor XSS geschützt werden
  • Als Betreiber vertraue keinen externen Scripten
  • Als Nutzer am besten Scriptblocker verwenden

Quelle: https://tinyurl.com/yd59aypx

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