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, obtain ... Read more »