oss-security - Re: CVE Request -- FontForge: Stack-based buffer overflow by processing specially-crafted CHARSET

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Date: Thu, 2 Dec 2010 15:55:09 -0500 (EST)
From: Josh Bressers <bressers@...hat.com>
To: oss-security@...ts.openwall.com
Cc: Ulrik Persson <ddefrostt@...il.com>,
        "Steven M. Christey" <coley@...us.mitre.org>
Subject: Re: CVE Request -- FontForge: Stack-based buffer
 overflow by processing specially-crafted CHARSET_REGISTRY font file header

Please use CVE-2010-4259 for this.

Thanks.

-- 
    JB


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

> Hello Steve, vendors,
> 
>    Ulrik Persson reported a stack-based buffer overflow
> flaw in the way FontForge font editor processed certain
> Bitmap Distribution Format (BDF) font files, with
> specially-crafted value of the CHARSET_REGISTRY header.
> A remote attacker could create a specially-crafted BDF
> font file and trick a local, unsuspecting user into
> opening it in FontForge, which could lead to fontforge
> executable crash or, potentially, arbitrary code execution
> with the privileges of the user running the executable.
> 
> References:
> [1] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=605537
> [2] https://bugzilla.redhat.com/show_bug.cgi?id=659359
> 
> Public PoC:
> [3]
> http://bugs.debian.org/cgi-bin/bugreport.cgi?msg=5;filename=fontforge-overflow.txt;att=1;bug=605537
> 
> Flaw severity note:
> On systems with compile time buffer checks (FORTIFY_SOURCE)
> feature enabled, the impact of this flaw is mitigated to
> be only crash.
> 
> Could you allocate a CVE id for this issue?
> 
> Thanks && Regards, Jan.
> --
> Jan iankko Lieskovsky / Red Hat Security Response Team

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