RE: remote DoS in Mozilla 1.0

jkeatingat_private

From what I have received personally from my post, 2 * resolution_height
sounds like a good idea.

Jon

> -----Original Message-----
> From: Keith Warno [mailto:keith.warnoat_private]
> Sent: Thursday, June 13, 2002 9:48 AM
> To: 'Tom'; bugtraqat_private
> Subject: RE: remote DoS in Mozilla 1.0
> 
> 
> |  -----Original Message-----
> |  From: Tom [mailto:tomat_private]
> |  Sent: Monday, June 10, 2002 4:20 AM
> |  To: bugtraqat_private
> |  Subject: remote DoS in Mozilla 1.0
> |
> 
> [...]
> 
> |
> |  Vendor Contact
> |  ==============
> 
> [...]
> 
> |  also filed with the XFree86 team, no reaction so far
> |
> |
> 
> 
> There is chatter but the same type of question regarding "at 
> what point [is]
> a request for a font ... clearly invalid" is being asked.
> 
> 
> ---------- Forwarded message ----------
> Date: Thu, 13 Jun 2002 09:46:56 +0100
> From: Juliusz Chroboczek <jecat_private>
> Reply-To: xpertat_private
> To: xpertat_private
> Subject: Re: [Xpert]abort() in libXfont 4.2.0 (was FW: remote DoS in
>     Mozilla 1.0)
> 
> From: Juliusz Chroboczek <jecat_private>
> Subject: Re: [bugtraq] remote DoS in Mozilla 1.0
> To: develat_private
> Date: 12 Jun 2002 08:51:49 +0100
> 
> MH> Interesting problem reported on bugtraq:
> MH> <http://online.securityfocus.com/archive/1/276120>
> 
> I see.  Two bugs here.
> 
> One is the dodgy error-handling in the Type 1 backend, which gives up
> by calling abort() (see the very end of curves.c).  I agree that this
> is a bug; however, as I'm hoping to phase out the current Type 1
> backend in favour of one based on FreeType 2 in time for 4.3.0, I do
> not intend to fix it.
> 
> The other problem is that we do not fail a priori requests for very
> large fonts.  I do agree that this should be done, and I think it
> should be done at the common layer (above the font backends); could
> anyone suggest at what point a request for a font is clearly invalid?
> 
>                                         Juliusz
> 
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