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I'm confused, isn't this just like XSRF (cross-site request forgery)?
On Wed, Jan 13, 2010 at 4:33 PM, Ronen Z <email@example.com> wrote:
> A new type of vulnerability is described in which publicly available
> information from social network sites obtained out of context, can be used
> to identify a user in cases where anonymity is taken for granted.
> This attack (dubbed Cross Site Identification, or CSID) assumes the
> following scenario: A user that is currently logged on to her social network
> account visits a 3rd party site, supposedly anonymously, in another browser
> tab. The 3rd party site causes her browser to contact the social network
> site and exploit the vulnerability resulting in her identity being disclosed
> to the attacker. The 3rd party target site is not necessarily controlled by
> the attacker. It could also be, for example, any site allowing user provided
> content that includes an image link (basically any forum or blog site).
> Other possibilities exist.
> While the information that is received by the attacker is technically
> publicly available, obtaining it in this manner effectively lifts the veil
> of anonymity from the user when interacting with the 3rd party site.
> Three social networks were tested and all were found to contain the
> vulnerability. These are Facebook, Orkut and Bebo. Some of the
> vulnerabilities were design flaws. The vulnerabilities are described and
> demonstrated. The sites were contacted in advance yet some of the
> vulnerabilities are still open.
> CSID is not bound only to social network sites but might be found on any
> site that authenticates its users. Various flavors of the attack are
> The post below contains a detailed description of the attack and its
> implications. It also includes details about the live vulnerabilities found.
> Post/White Paper:
> Ronen Zilberman
> Full-Disclosure - We believe in it.
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