Post on 26-Jul-2020
transcript
Philipp Markert, Florian Farke, and Markus Dürmuth
View The Email to Get Hacked:Attacking SMS-based Two-Factor Authentication
Santa Clara, California, USA | WAY 2019 | August 11, 2019
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Two-Factor Authentication
1 2
1
2FAAdoption
Gmail Confidential
Mode
Attacking Google’s
2FA
Are there alternatives?
3
2FAAdoption
analyzed top 100 websites
75 left
57 left
31 offer 2FA
25no login
18duplicates
26no 2FA
* Le Pochat et al. Tranco: A Research-Oriented Top Sites Ranking Hardened Against Manipulation. NDSS ’193
*
31 websites offer 2FA
25 (81%)
7 (23%)
4
24 (77%)
Gmail Confidential
Mode5
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7
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Tonight’s door code:
long long short long
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Link
Tonight’s door code:
long long short long
https://confidential-mail.google.com/msg/...
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Link
Tonight’s door code:
long long short long
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2FA Confidential Mode
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Attacking Google’s
2FA
alice@gmail.compw: wonderland
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1. Email
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1. Email
https://confidential-mail.google.com/msg/…
https://confidential-mail.oscar.com/msg/...
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1. Email
4. 6. G-123456
3. Login
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1. Email
5. G-1234562.
Confidential Mode
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Are therealternatives?
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1. Improve the text of the SMS
2FA
ConfidentialMode
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1. Improve the text of the SMS
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1. Improve the text of the SMS
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2. Use a Software Token
3. Use a Hardware Token
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31 websites offer 2FA
25 (81%)
7 (23%)
24 (77%)
alice@gmail.compw: wonderland
Philipp Markert, Florian Farke, and Markus Dürmuth
View The Email to Get Hacked:Attacking SMS-based Two-Factor Authentication
Santa Clara, California, USA | WAY 2019 | August 11, 2019