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RE: remote DoS in Mozilla 1.0
From: Jon Keating <jkeating () heuris com>
Date: Thu, 13 Jun 2002 13:42:14 -0500

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.warno () valaran com]
Sent: Thursday, June 13, 2002 9:48 AM
To: 'Tom'; bugtraq () securityfocus com
Subject: RE: remote DoS in Mozilla 1.0


|  -----Original Message-----
|  From: Tom [mailto:tom () lemuria org]
|  Sent: Monday, June 10, 2002 4:20 AM
|  To: bugtraq () securityfocus com
|  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 <jec () dcs ed ac uk>
Reply-To: xpert () XFree86 Org
To: xpert () XFree86 Org
Subject: Re: [Xpert]abort() in libXfont 4.2.0 (was FW: remote DoS in
    Mozilla 1.0)

From: Juliusz Chroboczek <jec () dcs ed ac uk>
Subject: Re: [bugtraq] remote DoS in Mozilla 1.0
To: devel () xfree86 org
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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