Re: [Full-disclosure] Exploiting sibling domains cookie isolation policy to DoS CDN users

2013-04-11 Thread Jan Wrobel
On Thu, Apr 11, 2013 at 6:05 PM, Jann Horn wrote: > On Thu, Apr 11, 2013 at 05:01:57PM +0200, Jan Wrobel wrote: >> [...] > > CDNs could mitigate this by, instead of resetting connections with lots of > headers, > just reading all the cookies and throwing them into the bit bucket instead of > kee

Re: [Full-disclosure] Exploiting sibling domains cookie isolation policy to DoS CDN users

2013-04-11 Thread Jann Horn
On Thu, Apr 11, 2013 at 05:01:57PM +0200, Jan Wrobel wrote: > Hello, > > In short: > > Browsers can be easily cut from any resources hosted on Content > Delivery Networks that use a domain shared between users, by a visit > to a malicious site that sets large number of cookies on the common > pre

Re: [Full-disclosure] Exploiting sibling domains cookie isolation policy to DoS CDN users

2013-04-11 Thread Jan Wrobel
On Thu, Apr 11, 2013 at 6:32 PM, Michal Zalewski wrote: > This is fairly well-known, I think; for example, there's a mention of this > here (search for appspot.com): > > http://lcamtuf.blogspot.com/2010/10/http-cookies-or-how-not-to-design.html Yes, the idea of such DoS technique is not new, but

Re: [Full-disclosure] Exploiting sibling domains cookie isolation policy to DoS CDN users

2013-04-11 Thread Michal Zalewski
This is fairly well-known, I think; for example, there's a mention of this here (search for appspot.com): http://lcamtuf.blogspot.com/2010/10/http-cookies-or-how-not-to-design.html I think it's also covered in "The Tangled Web"; it's also why you see domains such as blogspot.com and appspot.com i

[Full-disclosure] Exploiting sibling domains cookie isolation policy to DoS CDN users

2013-04-11 Thread Jan Wrobel
Hello, In short: Browsers can be easily cut from any resources hosted on Content Delivery Networks that use a domain shared between users, by a visit to a malicious site that sets large number of cookies on the common prefix of the CDN domain. For example, an HTML document on 'foo.rackcdn.com' (