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Date: Tue, 6 May 2014 20:55:58 +0200
From: Tomas Hoger <thoger@...hat.com>
To: oss-security@...ts.openwall.com
Cc: nicolas.gregoire@...rri.fr
Subject: Re: CVE-2014-0191 libxml2: external parameter entity
loaded when entity substitution is disabled
On Tue, 06 May 2014 20:21:28 +0200 Nicolas Grégoire wrote:
> > libxml2 [...] incorrectly performs entity substituton in the doctype
> > prolog, even if the application using libxml2 disabled any entity
> > substitution.
>
> I'm not sure that I understand this bug. Do you have a PoC?
The new issue is very similar to the one fixed by:
https://git.gnome.org/browse/libxml2/commit/?id=4629ee02ac649c27f9c0cf98ba017c6b5526070f
which is linked to the infamous CVE-2013-0339. 4629ee0 fixed the issue
for general entities, while the 9cd1c3c fixes the same type of problem
for parameter entities. Even when parsing without NOENT, external
parameter entities are fetched.
--
Tomas Hoger / Red Hat Security Response Team
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