Re: [http-state] Security considerations overview
Adam Barth <ietf@adambarth.com> Tue, 02 March 2010 21:55 UTC
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From: Adam Barth <ietf@adambarth.com>
Date: Tue, 02 Mar 2010 13:54:57 -0800
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Subject: Re: [http-state] Security considerations overview
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On Tue, Mar 2, 2010 at 1:46 PM, David Morris <dwm@xpasc.com> wrote: > On Tue, 2 Mar 2010, Adam Barth wrote: >> On Tue, Mar 2, 2010 at 11:42 AM, David Morris <dwm@xpasc.com> wrote: >> > On Tue, 2 Mar 2010, Adam Barth wrote: >> >> <t>Transport-layer encryption, such as HTTPS, is insufficient to >> >> prevent a network attacker from altering a victim's cookies because >> >> the cookie protocol does not provide integrity. By default, cookies >> >> are transmitted in the clear, where their confidentiality can be >> >> compromised by a network attacker.</t> >> > >> > I don't under stand how the second sentence extends the thought in the >> > first sentence. It seems in conflict in the sense that HTTPS is not >> > sending cookies in the clear and use of HTTPS is generally recommended >> > as the way to avoid compromise by network hackers. What am I missing? >> >> If even if you use the cookie protocol exclusively over HTTPS, the >> default is still to send the cookies in the clear (i.e., the >> secure-only-flag defaults to false). > > But wrapped inside of the HTTPS stream, it is like the remainder of > everything about the HTTP request (including headers), sans any general > HTTPS vulnerabilities, not visible on the network to hackers. > > If you are trying to say that a cookie sent on an HTTPS connection from > a server will be returned on any non-HTTPS connections and hence be > vulnerable in that context, the paragraph doesn't say that. To me it > says that even if my WHOLE application is HTTPS based, the cookies > are vulnerable on the network. Even if your whole application is HTTPS-based, the cookies are vulnerabile to active network attackers. That is a true statement, and precisely the security problem we're trying to point out in that sentence. Maybe this is a better formulation? [[ In addition, by default, the cookie protocol does not provide confidentiality from network attackers. ]] Adam
- [http-state] Security considerations overview Adam Barth
- Re: [http-state] Security considerations overview David Morris
- Re: [http-state] Security considerations overview Adam Barth
- Re: [http-state] Security considerations overview David Morris
- Re: [http-state] Security considerations overview Adam Barth
- Re: [http-state] Security considerations overview Tyler Close
- Re: [http-state] Security considerations overview Adam Barth
- Re: [http-state] Security considerations overview David Morris
- Re: [http-state] Security considerations overview Adam Barth
- Re: [http-state] Security considerations overview David Morris
- Re: [http-state] Security considerations overview Maciej Stachowiak
- Re: [http-state] Security considerations overview Maciej Stachowiak
- Re: [http-state] Security considerations overview Adam Barth
- Re: [http-state] Security considerations overview Adam Barth
- Re: [http-state] Security considerations overview =JeffH
- Re: [http-state] Security considerations overview Tyler Close
- Re: [http-state] Security considerations overview Achim Hoffmann
- Re: [http-state] Security considerations overview Achim Hoffmann
- Re: [http-state] Security considerations overview Mark Pauley
- Re: [http-state] Security considerations overview Mark Pauley
- Re: [http-state] Security considerations overview Dan Witte
- Re: [http-state] Security considerations overview Achim Hoffmann
- Re: [http-state] Security considerations overview Adam Barth
- Re: [http-state] Security considerations overview Mark Pauley
- Re: [http-state] Security considerations overview David Morris
- Re: [http-state] Security considerations overview Adam Barth