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5 Implications of HTML5 on
Security

© 2013, n.runs professionals GmbH – Security Research Team

Martin Herfurt
HTML5 Specification
• Started in the beginning of 2007
• Still an ongoing effort

© 2013, n.runs professionals GmbH – Security Research Team

Martin Herfurt
New Vectors For XSS
• New tags for hiding Javascript
– Tag for Scalable Vector Graphics (SVG)
– video

• Autofocus attribute
– Automatic code execution with ‘onfocus’

© 2013, n.runs professionals GmbH – Security Research Team

Martin Herfurt
Resident XSS
Remains in Browser
Code is persistently held in local storage
Arthur Janc implemented Browser Rootkit
Malicious manipulations cannot be
detected by Web application
• Possibility for XSS worms
•
•
•
•

© 2013, n.runs professionals GmbH – Security Research Team

Martin Herfurt
Cross Origin Requests
• Allows ressource sharing
• Circumvents SOP
• New Server has to send header:
– Access-Control-Allow-Origin: <name>
–…

• Allows network scanning
– Based on responsecode/timing

© 2013, n.runs professionals GmbH – Security Research Team

Martin Herfurt
WebSockets
• Bi-directional connections
• Can circumvent SOP (with tricks)
• Can be used for network scans

© 2013, n.runs professionals GmbH – Security Research Team

Martin Herfurt
Web Workers
• Sandboxed background execution for
javascript
• Malicious code
– Exhaust ressources

© 2013, n.runs professionals GmbH – Security Research Team

Martin Herfurt
Storage
• Local Storage
– 5-10MB depending on Browser

• Session Storage
– 5-10MB depending on Browser

• WebSQL
– Similar attack vectors as usual SQL (injections)

• Application Cache
– Offline availability for certain files

• Access permission based on SOP
© 2013, n.runs professionals GmbH – Security Research Team

Martin Herfurt
Thank You

http://blog.nruns.com/
Martin Herfurt (n.runs professionals GmbH)
© 2013, n.runs professionals GmbH – Security Research Team

Martin Herfurt

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ciso-platform-annual-summit-2013-5 implications of html5 on security by mherfurt

  • 1. 5 Implications of HTML5 on Security © 2013, n.runs professionals GmbH – Security Research Team Martin Herfurt
  • 2. HTML5 Specification • Started in the beginning of 2007 • Still an ongoing effort © 2013, n.runs professionals GmbH – Security Research Team Martin Herfurt
  • 3. New Vectors For XSS • New tags for hiding Javascript – Tag for Scalable Vector Graphics (SVG) – video • Autofocus attribute – Automatic code execution with ‘onfocus’ © 2013, n.runs professionals GmbH – Security Research Team Martin Herfurt
  • 4. Resident XSS Remains in Browser Code is persistently held in local storage Arthur Janc implemented Browser Rootkit Malicious manipulations cannot be detected by Web application • Possibility for XSS worms • • • • © 2013, n.runs professionals GmbH – Security Research Team Martin Herfurt
  • 5. Cross Origin Requests • Allows ressource sharing • Circumvents SOP • New Server has to send header: – Access-Control-Allow-Origin: <name> –… • Allows network scanning – Based on responsecode/timing © 2013, n.runs professionals GmbH – Security Research Team Martin Herfurt
  • 6. WebSockets • Bi-directional connections • Can circumvent SOP (with tricks) • Can be used for network scans © 2013, n.runs professionals GmbH – Security Research Team Martin Herfurt
  • 7. Web Workers • Sandboxed background execution for javascript • Malicious code – Exhaust ressources © 2013, n.runs professionals GmbH – Security Research Team Martin Herfurt
  • 8. Storage • Local Storage – 5-10MB depending on Browser • Session Storage – 5-10MB depending on Browser • WebSQL – Similar attack vectors as usual SQL (injections) • Application Cache – Offline availability for certain files • Access permission based on SOP © 2013, n.runs professionals GmbH – Security Research Team Martin Herfurt
  • 9. Thank You http://blog.nruns.com/ Martin Herfurt (n.runs professionals GmbH) © 2013, n.runs professionals GmbH – Security Research Team Martin Herfurt