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SECURITY IN THE AGE OF FRAMEWORKS LUKA KLADARIC // L@K.HR // @KLL - PowerPoint PPT Presentation

Mar 31, 2023 •98 likes •788 views

SECURITY IN THE AGE OF FRAMEWORKS LUKA KLADARIC // L@K.HR // @KLL 1 FSec 2016 2 FSec 2016 ONCE UPON A TIME... 3 FSec 2016 WE WROTE OUR OWN CODE 4 FSec 2016 ALL OF IT. 5 FSec 2016 so we knew what was in it. we knew every

  1. SECURITY IN THE AGE OF FRAMEWORKS LUKA KLADARIC // L@K.HR // @KLL 1 — FSec 2016

  2. 2 — FSec 2016

  3. ONCE UPON A TIME... 3 — FSec 2016

  4. WE WROTE OUR OWN CODE 4 — FSec 2016

  5. ALL OF IT. 5 — FSec 2016

  6. so we knew what was in it. we knew every little bit. 6 — FSec 2016

  7. WHO IS THIS GUY? 7 — FSec 2016

  8. Luka Kladaric (1985) started doing web stuff around 1997 javascript before jQuery server-side with ASP/VBScript (~1999) ran away to PHP (~2002) ran away to Python (~2013) ran away to devops 8 — FSec 2016

  9. Today we "know better" than to code everything from scratch 9 — FSec 2016

  10. So we rely on frameworks 10 — FSec 2016

  11. and libraries & a bunch of 3rd party code 11 — FSec 2016

  12. we outsource authentication... 12 — FSec 2016

  13. logging... 13 — FSec 2016

  14. database interaction... 14 — FSec 2016

  15. API connectivity... 15 — FSec 2016

  16. everything that isn't strictly unique to the problem we're solving 16 — FSec 2016

  17. this presents a RTFM problem 17 — FSec 2016

  18. How does this problem manifest itself? 18 — FSec 2016

  19. Story time! (Demo 1) 19 — FSec 2016

  20. Example Co builds their first webapp > an internal dashboard at control.example.com > authentication? 20 — FSec 2016

  21. 21 — FSec 2016

  22. 22 — FSec 2016

  23. 23 — FSec 2016

  24. But if the servers only ever see HTTP, how will they know about HTTPS? 24 — FSec 2016

  25. Spoiler: they won't (not by default anyway) 25 — FSec 2016

  26. What we'd like to see 26 — FSec 2016

  27. 27 — FSec 2016

  28. 28 — FSec 2016

  29. Fixes: > respect X-Forwarded-Proto header 29 — FSec 2016

  30. watch out for various components treating security headers differently 30 — FSec 2016

  31. > SSL config change triggers audit 31 — FSec 2016

  32. > remove http from oauth whitelist 32 — FSec 2016

  33. > HSTS headers 1 1 HTTP Strict Transport Security 33 — FSec 2016

  34. difficult to catch, browsers don't report this as bad behavior 34 — FSec 2016

  35. Story time! (Demo 2) 35 — FSec 2016

  36. 36 — FSec 2016

  37. 37 — FSec 2016

  38. if you've ever set up oAuth 38 — FSec 2016

  39. for multiple apps 39 — FSec 2016

  40. against the same provider 40 — FSec 2016

  41. ... did you bother setting up separate oAuth clients? 41 — FSec 2016

  42. yeah. 42 — FSec 2016

  43. 43 — FSec 2016

  44. Story time! (demo 3) 44 — FSec 2016

  45. Cookie: session=.eJxljssKgkAYRl8l_rWJl1ScnW kLC8msaBEik046po7YGF7w3Su3bg7f4vBxR M1Zl-C6g3BpcVqS6M1xWQOSN4ZqKrJqatMX y0NLzg.CrvTRg.5bTUddcAEVMFMth_I uPteZT0OjA; HttpOnly; Path=/ 45 — FSec 2016

  46. How is cookie signed 46 — FSec 2016

  47. Flask 47 — FSec 2016

  48. Django 48 — FSec 2016

  49. 49 — FSec 2016

  50. 50 — FSec 2016

  51. SECRET_KEY being configured badly is next to impossible to catch 51 — FSec 2016

  52. All of these combined mean: 52 — FSec 2016

  53. spear phishing vector 53 — FSec 2016

  54. privilege escalation 54 — FSec 2016

  55. forced insecure comms 55 — FSec 2016

  56. attacker traffic indistinguishable from regular traffic 56 — FSec 2016

  57. the LB here isn't to blame 57 — FSec 2016

  58. people have ancient bookmarks pointing to http 58 — FSec 2016

  59. ALL THINGS BEING EQUAL BUT RUNNING ON A SINGLE MACHINE THIS WOULD STILL BE A VULNERABLE SETUP 59 — FSec 2016

  60. HSTS IS A MUST 60 — FSec 2016

  61. Story time! (Demo 4) 61 — FSec 2016

  62. CSRF protection disabled yup. found this one too. 62 — FSec 2016

  63. IT COMES WITH THE THING LEAVE CSRF PROTECTION ALONE 63 — FSec 2016

  64. TAKEAWAYS UNDERSTAND THE STUFF YOU USE BETTER. 64 — FSec 2016

  65. BE MORE VIGILANT WITH CODE REVIEWS ON SECURITY-IMPACTING STUFF 65 — FSec 2016

  66. BRING IN A FRESH PAIR OF EYES EVERY ONCE IN A WHILE 66 — FSec 2016

  67. This talk is not an endorsement to roll everything yourself. 67 — FSec 2016

  68. THANK YOU LUKA KLADARIC // L@K.HR // @KLL 68 — FSec 2016

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