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[ft-devel] details on iPhone exploit caused by FreeType?

From: Werner LEMBERG
Subject: [ft-devel] details on iPhone exploit caused by FreeType?
Date: Fri, 08 Jul 2011 11:48:00 +0200 (CEST)


has anyone more information on the recent exploit for the iPhone,
reportedly caused by a problem within FreeType's
`t1_decoder_parse_charstrings'?  Extracting the buggy font from

and testing the current ftview (from the git repository, but rather
the same as with version 2.4.5) with valgrind on my GNU/Linux box, I
get a bunch of

  Conditional jump or move depends on uninitialised value(s)

but nothing else (and I'll fix these problems in due course).

I must admit that I'm rather poor at understanding such exploits, but
AFAIK, a conditional jump can't be abused for executing arbitrary
code, right?  Please correct me if I'm wrong.


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