On Sat, 22 Oct 2005, K-Gen Gen wrote:
phpBB 2.0.17 (and other BB systems as well) Cookie disclosure exploit.
I sent the report to phpBB and they said that a patch will be available
withing a few days and It will be integrated into 2.0.18 .
Note: This works like XSS, and requires the victim to use IE (Affects all
versions of IE).
I've confirmed this in various webapp platforms and made contact with
their vendors. This isn't limited to just avatar remote uploads, but for
attachments, and anything else that is permitted to render on the target
example.com site.
One suggestion to a fix is deny the ability for any off site images to be
rendered at all. But then that means handling on site file input
validation checking to see if an image is actually just that.
Off site file checking can still be spoofed. For instance, the target
example.com site may check a remote image and confirms it is just that.
The remote server may then send altogether different content to the
example.com member.
Safest thing at least right now is to IMVHO disable remote image
rendering, and validate file input on the target on site example.com.
Anyone have other ideas on this? I've already implemented some code to
validate file input and its working. But is this the right approach?
--
Paul Laudanski, Microsoft MVP Windows-Security
http://castlecops.com - http://wiki.castlecops.com
CastleCops Deutsch - German Internet Security coming online soon!
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