BugTraq
Opentype font file causes Windows to restart. Jan 06 2003 03:36PM
Andrew (aconnell xtra co nz) (4 replies)
Re: Opentype font file causes Windows to restart. Jan 09 2003 08:18AM
Kaspar Brand (ot velox ch)
[Since my first attempt yesterday was not approved by the BugTraq
moderator, I'm trying it again, this time in a slightly different format
and CC'ing vulnwatch, too.]

The problem is due to "incorrect" data in the "CFF" table of this font -
for details, please see the attached message I sent to the OpenType
mailing list (http://www.topica.com/lists/opentype - note that I have
omitted the attachment to this message, which was Andrew's original
BugTraq posting).

This specific flavor of an OpenType font (CFF outlines, i.e.
"PostScript" data) is only supported natively by Windows 2000 and later.
For previous Windows versions, you need ATM (Adobe Type Manager) to
display such a font. Please note that the crash only occurs when trying
to render the "o" character (that's what fontview.exe tries to do, of
course).

As far as the creation of an embedded font for IE (.eot, embedded
OpenType) is concerned, I'm not sure if it's possible to trigger the bug
this way. When installing the "restarter" font and listing the fonts
available for embedding in WEFT, Microsoft's Web Embedding Fonts Tool
(the only publicly available tool I know of to create such fonts),
OpenType fonts with CFF outline data do not appear in the list of
available fonts. I suppose WEFT is currently limited to embed OpenType
fonts with TrueType outlines ("glyf" table) or plain PostScript Type 1
fonts (.pfb file suffix). The .eot format is not documented, as far as I
know, so creating such a font manually would probably require quite some
experimenting, and even then the question remains if IE would actually
be able to deal with this font format and display the characters.

Kaspar

[ reply ]
Re: Opentype font file causes Windows to restart. Jan 07 2003 05:16AM
Mark Litchfield (mark ngssoftware com)
Re: Opentype font file causes Windows to restart. Jan 07 2003 02:58AM
Floyd Russell (floyd neospire net) (1 replies)
Re: Opentype font file causes Windows to restart. Jan 08 2003 07:09PM
Chris Ridd (chris ridd isode com)
Re: Opentype font file causes Windows to restart. Jan 06 2003 11:27PM
Steven Tucker (bugtraq-spam atarimax com)


 

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