Re: Security Advisory for ALL forum services with client-set images

[Tim Jackson <lists () timj co uk>]

On 22 Dec 2004, James Bandara wrote:

[rediscovering CSRF]

> A user could copy one of these links to delete his own thread, edit it
> so the querystring is for another users post, and post it up as a link
> or avatar.
> In effect if an admin sees the image or the original user sees it, it
> will instantly delete the post as its on the same site no extra login is
> needed.

What you've identified is part of a general class of similar problems and
was discussed quite extensively on this list back in summer 2001. Read the
thread starting here:

http://www.securityfocus.com/archive/1/191114

culminating in a comprehensive analysis by "Peter W" in which he names the
general problem "CSRF" (Cross-Site Request Forgeries):

http://www.securityfocus.com/archive/1/191390


Tim