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Message-Id: <201102081154.16647.thomas@suse.de>
Date: Tue, 8 Feb 2011 11:54:16 +0100
From: Thomas Biege <thomas@...e.de>
To: oss-security@...ts.openwall.com
Subject: Re: CVE request: xpdf
Should CVE-IDs be assigned to this issues?
Am Freitag 21 Januar 2011 00:15:49 schrieb Dan Rosenberg:
> I identified two issues in xpdf. I don't think the first requires a
> CVE, since it's incredibly unlikely to be exploitable, but I include
> it here in case someone disagrees.
>
> 1. Due to an integer overflow when parsing CharCodes for fonts and a
> failure to check the return value of a memory allocation, it is
> possible to trigger writes to a narrow range of offsets from a NULL
> pointer. The chance of being able to exploit this for anything other
> than a crash is very remote: on x86 32-bit, there's no chance (since
> the write occurs between 0xffffffc4 and 0xfffffffc). At least the
> write lands in valid userspace on x86-64, but in my testing this
> memory is never mapped. Fixed in poppler commit at [1], hopefully
> fixed soon at xpdf upstream.
>
> 2. Malformed commands may cause corruption of the internal stack used
> to maintain graphics contexts, leading to potentially exploitable
> memory corruption. Fixed in poppler commit at [2], hopefully fixed
> soon at xpdf upstream.
>
> -Dan
>
> [1] http://cgit.freedesktop.org/poppler/poppler/commit/?id=cad66a7d25abdb6aa15f3aa94a35737b119b2659
> [2] http://cgit.freedesktop.org/poppler/poppler/commit/?id=8284008aa8230a92ba08d547864353d3290e9bf9
>
--
Thomas Biege <thomas@...e.de>, SUSE LINUX, Security Support & Auditing
SUSE LINUX Products GmbH, GF: Markus Rex, HRB 16746 (AG Nuernberg)
--
Wer aufhoert besser werden zu wollen, hoert auf gut zu sein.
-- Marie von Ebner-Eschenbach
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