Quick Wins for Better Website Security by Dan Callahan

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QUICK WINS FOR BETTER WEBSITE SECURITY ! Dan Callahan ! [email protected] dancallahan.info @callahad

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THREE PARTS Transmitting Rendering Storing

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TRANSMITTING

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USE SSL

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Apple iOS / OS X TLS, 21 Feb 2014 gotofail.com goto fail; goto fail;

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OpenSSL “Heartbleed,” 7 April 2014 heartbleed.com

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SERIOUSLY, USE SSL

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http://... Browser http://... Browser https://... https://...

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http://... Browser http://... Browser https://... https://...

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http://... Browser http://... Browser https://... https://...

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http://... Browser http://... Browser https://... https://...

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http://... Browser http://... Browser https://... https://...

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http://... Browser http://... Browser https://... https://... Cookies Cookies

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http://... Browser http://... Browser https://... https://... Attacker Attacker Cookies Cookies

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http://... Browser http://... Browser https://... https://... Attacker Attacker Cookies Cookies

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http://... Browser http://... Browser https://... https://... Attacker Attacker Cookies Cookies

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USE SECURE COOKIES

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Set-Cookie: xs=984ea98f98a6a19c

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Set-Cookie: xs=984ea98f98a6a19c; secure

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http://... Browser http://... Browser https://... https://... Attacker Attacker Cookies Cookies

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http://... Browser http://... Browser https://... https://... Attacker Attacker Cookies

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http://... Browser http://... Browser https://... https://... Attacker Attacker Cookies

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http://... Browser http://... Browser https://... https://... Attacker Attacker Cookies

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https://www.bankofamerica.com http://bankofamerica.com http://www.bankofamerica.com

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https://www.bankofamerica.com http://bankofamerica.com http://www.bankofamerica.com

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https://www.bank0famerica.com bank0famerica.com? http://bankofamerica.com http://www.bankofamerica.com

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http://... Browser http://... Browser https://... https://... Attacker Attacker Cookies

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http://... Browser http://... Browser https://... https://... Attacker Attacker

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USE STRICT TRANSPORT SECURITY

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Strict-Transport-Security: max-age=2592000

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http://... Browser http://... Browser https://... https://... Attacker Attacker Cookies

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http://... Browser http://... Browser https://... https://... Attacker Attacker Cookies

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TRANSMIT RENDER STORE ! SSL ! Secure Cookies ! Strict Transport Security

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RENDERING

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Set-Cookie: xs=984ea98f98a6a19c; secure

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Set-Cookie: xs=984ea98f98a6a19c; secure alert(document.cookie);

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Set-Cookie: xs=984ea98f98a6a19c; secure alert(document.cookie); “xs=984ea98f98a6a19c”

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USE HTTPONLY COOKIES

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Set-Cookie: xs=984ea98f98a6a19c; secure alert(document.cookie); “xs=984ea98f98a6a19c”

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Set-Cookie: xs=984ea98f98a6a19c; secure; HttpOnly alert(document.cookie); “xs=984ea98f98a6a19c”

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Set-Cookie: xs=984ea98f98a6a19c; secure; HttpOnly alert(document.cookie); “”

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USE A CONTENT SECURITY POLICY

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Content-Security-Policy: default-src 'self'; img-src 'self' data:; script-src: 'self' https://api.example.com ! ! ! ! !

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Content-Security-Policy: default-src 'self'; img-src 'self' data:; script-src: 'self' https://api.example.com ! Content-Security-Policy-Report-Only: default-src 'self'; img-src 'self' data:; script-src: 'self' https://api.example.com

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TRANSMIT RENDER STORE ! SSL ! Secure Cookies ! Strict Transport Security ! HttpOnly Cookies ! Content Security Policy

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TRANSMIT RENDER STORE ! SSL ! Secure Cookies ! Strict Transport Security ! HttpOnly Cookies ! Content Security Policy

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SET FRAME OPTIONS

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X-Frame-Options: DENY X-Frame-Options: SAMEORIGIN X-Frame-Options: ALLOW-FROM uri

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USE XSS PROTECTION

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X-XSS-Protection: 1; mode=block

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DISABLE MIME-TYPE SNIFFING

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X-Content-Type-Options: nosniff

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TRANSMIT RENDER STORE ! SSL ! Secure Cookies ! Strict Transport Security ! HttpOnly Cookies ! Content Security Policy ! Frame Options ! XSS Protection ! MIME-Type Sniﬃng

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STORING

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ISOLATE USER CONTENT

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Not your main domain Not a subdomain github.io googleusercontent.com

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DON’T USE PASSWORDS

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SUMMARY

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TRANSMIT RENDER STORE ! SSL ! Secure Cookies ! Strict Transport Security ! HttpOnly Cookies ! Content Security Policy ! Frame Options ! XSS Protection ! MIME-Type Sniﬃng ! User Content Domain ! ! Don’t Store Passwords