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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)
Yi-Feng Tzeng
March 29, 2018
Technology
1
190
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。
Yi-Feng Tzeng
March 29, 2018
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Transcript
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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
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2/74 Introduction Coding Security Intellectual property Startup • • •
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3/74 Thank @mathias for inspiring me
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4/74 Ref: Front-End Performance The Dark Side @ ColdFront Conference
2016
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5/74 Ref: Front-End Performance The Dark Side @ ColdFront Conference
2016
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6/74 Ref: Front-End Performance The Dark Side @ ColdFront Conference
2016
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7/74 Ref: Front-End Performance The Dark Side @ ColdFront Conference
2016 1000 µs 1000 µs 100 µs 200 µs
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8/74 Ref: Front-End Performance The Dark Side @ ColdFront Conference
2016
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9/74 Ref: Front-End Performance The Dark Side @ ColdFront Conference
2016 A000000 B000000 … E000000 EA00000 …
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10/74 Ref: Front-End Performance The Dark Side @ ColdFront Conference
2016
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11/74 Ref: Front-End Performance The Dark Side @ ColdFront Conference
2016 1000 µs 1000 µs 100 µs 200 µs
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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
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13/74 PHP Are PHP functions safe against timing attacks ?
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14/74
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15/74 DEMO #01
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16/74
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17/74 Those work on web ideally ?
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18/74 localhost
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19/74
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20/74 Applicaton jitte 10-30 ms Databast jitte 10-300 ms Nttwoek
jitte 100-150 ms
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21/74 Attack Shift Timing atack against sofwaet impltmtntaton
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22/74 Attack Shift Timing atack against sofwaet impltmtntaton Ideal
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23/74 Attack Shift Timing atack against sofwaet impltmtntaton Ideal Timing
atack against busintss logic Reality
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24/74
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25/74 ~2500 ms
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26/74 ~1500 ms
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27/74 Login Admin User 100 ms 2500 ms 1500 ms
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28/74 Login Admin User 100 ms 2500 ms 1500 ms
~1000 ms
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29/74 Login Admin User 100 ms 2500 ms 1500 ms
Validate user 100 ms ~1000 ms
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30/74
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31/74 100 ms
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32/74 100 ms Email guess, brute force attack
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33/74 Which one is better ?
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34/74
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35/74 100 ms
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36/74 100 ms 100 ms
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37/74 100 ms 100 ms 100 ms
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38/74 100 ms 100 ms 100 ms DEMO #02
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39/74 100 ms 100 ms 100 ms
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40/74 Login Admin User Gender Age VIP 100 ms 2500
ms 1500 ms 1000 ms 1000 ms 1200 ms …... …... Validate user 100 ms
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41/74 Welcome Ant ! ~1000 ms
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42/74 ~500 ms
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43/74 old
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44/74 ~30 ms Ref: Front-End Performance The Dark Side @
ColdFront Conference 2016 (p52)
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45/74 Ref: Front-End Performance The Dark Side @ ColdFront Conference
2016 (p54) ~15 ms
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46/74 Ref: Front-End Performance The Dark Side @ ColdFront Conference
2016 (p50)
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47/74 Login Admin User Gender Age VIP 100 ms 2500
ms 1500 ms 1000 ms 1000 ms 1200 ms …... …... Validate user 100 ms
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48/74 404 Page not found ~200 ms
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49/74 404 Page not found ~80 ms
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50/74
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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
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52/74
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53/74
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54/74
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55/74
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56/74
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57/74
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58/74 DEMO Online
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59/74 Applicaton jitte 10-30 ms Databast jitte 10-300 ms Nttwoek
jitte 100-150 ms
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60/74 LAN Router IoT device NAS server / etc. POS
/ Console / etc.
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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
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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
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63/74
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64/74 DEMO #03
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65/74 A000000 B000000 … E000000 EA00000 …
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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 ~
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67/74 Attack Modes Post-auth Administrator Permissions Hidden page* Pre-auth Hidden
page* Validate user Backdoor Active attacks Passive attacks
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68/74 Passive attacks
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69/74 Active attacks
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70/74 Attack Modes Post-auth Administrator Permissions Hidden page* Pre-auth Hidden
page* Validate user Backdoor Active attacks Passive attacks
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71/74 password hash function ?
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72/74 password hash function ? DEMO #04
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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 ~
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74/74 ant@chroot.org / yftzeng@gmail.com https://www.facebook.com/yftzeng.tw https://twitter.com/yftzeng
Yi-Feng Tzeng
yftzeng
reverentgeek
rmw
skipperchong
carmenhchung
keathley
productmarketing
clairelew
thoeni
jcasabona
