Patch to parameter entity XXE in libxml2 (CVE-2014-0191) vulnerability

Date: Tue, 6 May 2014 17:55:38 +0200
From: Stefan Cornelius <scorneli@...hat.com>
To: oss-security@...ts.openwall.com
Subject: CVE-2014-0191 libxml2: external parameter entity loaded when entity
 substitution is disabled

Hi,

It was discovered that libxml2, a library providing support to read,
modify and write XML files, incorrectly performs entity substituton in
the doctype prolog, even if the application using libxml2 disabled any
entity substitution. A remote attacker could provide a
specially-crafted XML file that, when processed, would lead to the
exhaustion of CPU and memory resources or file descriptors.

This issue was discovered by Daniel Berrange of Red Hat.

Upstream patch:
https://git.gnome.org/browse/libxml2/commit/?id=9cd1c3cfbd32655d60572c0a413e017260c854df

Red Hat bug:
https://bugzilla.redhat.com/show_bug.cgi?id=1090976

-- 
Stefan Cornelius / Red Hat Security Response Team