oss-security - Re: CVE Request -- FreeType -- Memory corruption flaw by processing certain LWFN fonts + three more

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Date: Fri, 6 Aug 2010 14:32:07 -0400 (EDT)
From: Josh Bressers <bressers@...hat.com>
To: oss-security@...ts.openwall.com
Cc: "Steven M. Christey" <coley@...us.mitre.org>, Werner Lemberg <wl@....org>
Subject: Re: CVE Request -- FreeType -- Memory corruption
 flaw by processing certain LWFN fonts + three more

----- "Jan Lieskovsky" <jlieskov@...hat.com> wrote:

> 
>    just for more complete list. There are more of them:
>      [1] https://savannah.nongnu.org/bugs/?30644
>          Patch at: 
> http://git.savannah.gnu.org/cgit/freetype/freetype2.git/commit/?id=45a3c76b547511fa9d97aca34b150a0663257375

I'm going to call this improper bounds checking.
Use CVE-2010-2805

>      [2] https://savannah.nongnu.org/bugs/?30656
>          Patch at:
> http://git.savannah.gnu.org/cgit/freetype/freetype2.git/commit/?id=c06da1ad34663da7b6fc39b030dc3ae185b96557

We'll also call this improper bounds checking. I'm giving it its own ID, as
the various versions affected will no doubt differ.
Use CVE-2010-2806

>      [3] https://savannah.nongnu.org/bugs/?30657
>          Patch at:
> http://git.savannah.gnu.org/cgit/freetype/freetype2.git/commit/?id=346f1867fd32dae8f56e5b482d1af98f626804ac

I'm not exactly sure what to call this one. It seems to involve improper
type comparisons (int vs long).
Use CVE-2010-2807

> >   A memory corruption flaw was found in the way FreeType font rendering
> >   engine processed certain Adobe Type 1 Mac Font File (LWFN) fonts. An
> >   attacker could use this flaw to create a specially-crafted font file
> >   that, when opened, would cause an application linked against
> >   libfreetype to crash, or, possibly execute arbitrary code.
> > 
> > Upstream bug report:
> >   [1] https://savannah.nongnu.org/bugs/?30658
> > 
> > Public reproducer:
> >   [2] http://alt.swiecki.net/j/f/sigsegv31.ttf
> > 
> > Upstream changeset:
> >   [3] http://git.savannah.gnu.org/cgit/freetype/freetype2.git/commit/?id=81f3472c0ba7b8f6466e2e214fa8c1c17fade975
> > 
> > References:
> >   [4] https://bugzilla.redhat.com/show_bug.cgi?id=621907
> > 
> > Credit: Robert Swiecki

Use CVE-2010-2808 for this one.

Thanks.

-- 
    JB

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