[Owasp-leaders] HTML5 local storage..

Eoin eoin.keary at owasp.org
Thu Dec 5 10:06:42 UTC 2013

Hi Chris,
What your saying is using local storage as a "certificate store" sorta
affair? Like a keystore for auth/authz when using an app?

On 5 December 2013 09:56, Christian Papathanasiou <
christian.papathanasiou at owasp.org> wrote:

> Hi everyone,
> Assuming a domain does all the right stuff regarding XSS protection (white
> listing, output encoding, CSP etc etc) could HTML 5 local storage perhaps
> be a very interesting candidate for storing session cookies and performing
> authentication/authorization?
> Reading between the lines the following key benefits stood out for me:
> Local storage token/cookie not transmitted over  the wire hence minimising
> opportunity of cookie theft from sniffing
> Same origin policy means that local storage cookie will be
> protected/relatively kimmune from CSRF attacks and hence no additional
> effort required to CSRF tokenize forms etc.
> Of course, if your site has XSS then local storage cookies can be siphoned
> off or even injected but assuming for the time being that the site is
> immune to XSS and hence the lack of http only doesn't really matter and
> everything going over SSL by default (hence secure flag doesn't really
> matter) would the above benefits hold true?
> Of course the user can mangle the local storage token/cookie but that
> would  in effect not really be different to doing the same with burp proxy
> etc as long as token/cookie is sufficiently random complex etc and unable
> to infer other peoples session tokens for horizontal or vertical priv esc.
> Am I missing something fundamental  from a security perspective here? :-)
> Finally are there any local storage authentication/authorization
> frameworks out there?
> Many thanks & kind regards,
> Christian Papathanasiou.
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Eoin Keary
OWASP Member
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