Re: phpBB 2.0.17 remote avatar size bug

[Peter Kieser <pfak () telus net>]

This isn't even a bug. How this got past Bugtraq moderators is beyond 
me. The "discoverer" goes on to say that to "fix" the problem you would 
check the size of the image. Are you going to check the size of the 
image on every page load? This is far from a bug..

--Peter

SmOk3 wrote:

> Title: phpBB remote avatar size bug
> Software: phpBB 2.0.17 (and maybe prior versions)
> Discovered by: David Sopas Ferreira < david at systemsecure dot org >
> Original link: http://www.systemsecure.org/ssforum/viewtopic.php?t=272
>
>
> » Email from phpBB «
>
> Your report "Avatar size" has been closed because your reported issue is
> invalid.
> Classifying a report as invalid can have various reasons, most of the time
> the report is incomplete.
>
> If you think your report has been handled incorrecly, please submit
> another report at http://www.phpbb.com/security/index.php.
>
>
> Comment added by team member:
>
> This isn't a security problem. You can do the same thing with a standard
> webpage. As for checking remote avatar size, there are several inherit
> problems with that, which I won't detail here. As this isn't a security
> problem, closing.
>
> » End Of Mail - «
>
>
> » My personnal opinion:
>
> I think this is a minor security problem. A malicious user can use larger images
> (for example: 1280px - 1024px) to almost damage the entire view of a
> topic. This, to
> be done, has to have Remote Avatar selected.
>
> So, if the admins don't consider this a minor security problem, what
> is it? A "special"
> feature?
>
> I don't want to criticize the phpBB coders, but why is it dificult to
> check out the size
> of a image and telling the user that that size of image it's not
> possible, or even block the
> size on the viewtopic table, something like that.
>
>
> » Possible solution:
>
> Disable remote avatar or just dig in the code to set the image size you want.
>
>