邏輯優化的灰色面：針對網頁應用的時序攻擊 (2018臺灣資安大會: 軟體安全論壇)

一般人對於應用程式的撰寫邏輯與順序，只考量正確性及效能面。但是從灰色的視角切入時，時序或時間差所透露的資訊往往比我們想像中來得多。本議程將針對網頁應用上的時序攻擊，探討邏輯優化可能帶來的安全問題。

Transcript

1. 邏輯優化的灰色面 針對網頁應用的時序攻擊 ( Timing Attacks on Web ) Ant ant@chroot.org / yftzeng@gmail.com 2018-03-13
2. 2/74 Introduction Coding Security Intellectual property Startup • • •
3. 3/74 Thank @mathias for inspiring me
4. 4/74 Ref: Front-End Performance The Dark Side @ ColdFront Conference 2016
5. 5/74 Ref: Front-End Performance The Dark Side @ ColdFront Conference 2016
6. 6/74 Ref: Front-End Performance The Dark Side @ ColdFront Conference 2016
7. 7/74 Ref: Front-End Performance The Dark Side @ ColdFront Conference 2016 1000 µs 1000 µs 100 µs 200 µs
8. 8/74 Ref: Front-End Performance The Dark Side @ ColdFront Conference 2016
9. 9/74 Ref: Front-End Performance The Dark Side @ ColdFront Conference 2016 A000000 B000000 … E000000 EA00000 …
10. 10/74 Ref: Front-End Performance The Dark Side @ ColdFront Conference 2016
11. 11/74 Ref: Front-End Performance The Dark Side @ ColdFront Conference 2016 1000 µs 1000 µs 100 µs 200 µs
12. 12/74 Premature optimization is the root of all evil ( 過早最佳化是萬惡的根源 ) ~ Donald Knuth ~ a little bit
13. 13/74 PHP Are PHP functions safe against timing attacks ?
14. 14/74
15. 15/74 DEMO #01
16. 16/74
17. 17/74 Those work on web ideally ?
18. 18/74 localhost
19. 19/74
20. 20/74 Applicaton jitte 10-30 ms Databast jitte 10-300 ms Nttwoek jitte 100-150 ms
21. 21/74 Attack Shift Timing atack against sofwaet impltmtntaton
22. 22/74 Attack Shift Timing atack against sofwaet impltmtntaton Ideal
23. 23/74 Attack Shift Timing atack against sofwaet impltmtntaton Ideal Timing atack against busintss logic Reality
24. 24/74
25. 25/74 ~2500 ms
26. 26/74 ~1500 ms
27. 27/74 Login Admin User 100 ms 2500 ms 1500 ms
28. 28/74 Login Admin User 100 ms 2500 ms 1500 ms ~1000 ms
29. 29/74 Login Admin User 100 ms 2500 ms 1500 ms Validate user 100 ms ~1000 ms
30. 30/74
31. 31/74 100 ms
32. 32/74 100 ms Email guess, brute force attack
33. 33/74 Which one is better ?
34. 34/74
35. 35/74 100 ms
36. 36/74 100 ms 100 ms
37. 37/74 100 ms 100 ms 100 ms
38. 38/74 100 ms 100 ms 100 ms DEMO #02
39. 39/74 100 ms 100 ms 100 ms
40. 40/74 Login Admin User Gender Age VIP 100 ms 2500 ms 1500 ms 1000 ms 1000 ms 1200 ms …... …... Validate user 100 ms
41. 41/74 Welcome Ant ! ~1000 ms
42. 42/74 ~500 ms
43. 43/74 old
44. 44/74 ~30 ms Ref: Front-End Performance The Dark Side @ ColdFront Conference 2016 (p52)
45. 45/74 Ref: Front-End Performance The Dark Side @ ColdFront Conference 2016 (p54) ~15 ms
46. 46/74 Ref: Front-End Performance The Dark Side @ ColdFront Conference 2016 (p50)
47. 47/74 Login Admin User Gender Age VIP 100 ms 2500 ms 1500 ms 1000 ms 1000 ms 1200 ms …... …... Validate user 100 ms
48. 48/74 404 Page not found ~200 ms
49. 49/74 404 Page not found ~80 ms
50. 50/74
51. 51/74 Login Admin User Gender Age VIP 100 ms 2500 ms 1500 ms 1000 ms 1000 ms 1200 ms …... …... Validate user 100 ms 302 / 404 80 ms 1200 ms
52. 52/74
53. 53/74
54. 54/74
55. 55/74
56. 56/74
57. 57/74
58. 58/74 DEMO Online
59. 59/74 Applicaton jitte 10-30 ms Databast jitte 10-300 ms Nttwoek jitte 100-150 ms
60. 60/74 LAN Router IoT device NAS server / etc. POS / Console / etc.
61. 61/74 Login Admin User Gender Age VIP 100 ms 2500 ms 1500 ms 1000 ms 1000 ms 1200 ms …... …... Validate user 100 ms 302 / 404 80 ms 1200 ms
62. 62/74 SuperUser Login Admin User Gender Age VIP 100 ms 100 ms 2500 ms 1500 ms 1000 ms 1000 ms 1200 ms Backdoor …... …... 400 ms Validate user 100 ms 302 / 404 80 ms 1200 ms
63. 63/74
64. 64/74 DEMO #03
65. 65/74 A000000 B000000 … E000000 EA00000 …
66. 66/74 最佳化就像迴旋鏢，何時不小心回來打到你，可能也不知道 ~ Ant ~
67. 67/74 Attack Modes Post-auth Administrator Permissions Hidden page* Pre-auth Hidden page* Validate user Backdoor Active attacks Passive attacks
68. 68/74 Passive attacks
69. 69/74 Active attacks
70. 70/74 Attack Modes Post-auth Administrator Permissions Hidden page* Pre-auth Hidden page* Validate user Backdoor Active attacks Passive attacks
71. 71/74 password hash function ?
72. 72/74 password hash function ? DEMO #04
73. 73/74 安全就像洋蔥，一片一片地剝開，總有一片會讓人流淚 ~ Ant ~
74. 74/74 ant@chroot.org / yftzeng@gmail.com https://www.facebook.com/yftzeng.tw https://twitter.com/yftzeng