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Date: Tue, 10 Feb 2015 15:28:42 -0800
From: Alan Coopersmith <alan.coopersmith@...cle.com>
To: oss-security@...ts.openwall.com
Subject: Fwd: X.Org Security Advisory: CVE-2015-0255: Information leak in
 the XkbSetGeometry request of X servers




-------- Original Message --------
Subject: X.Org Security Advisory: CVE-2015-0255: Information leak in the 
XkbSetGeometry request of X servers
Date: Wed, 11 Feb 2015 08:48:35 +1000
From: Peter Hutterer <peter.hutterer@...hat.com>
To: xorg-announce@...ts.x.org
CC: Olivier Fourdan <ofourdan@...hat.com>, xorg@...ts.x.org, 
xorg-devel@...ts.x.org

X.Org Security Advisory: Feb 10, 2015 - CVE-2015-0255
Information leak in the XkbSetGeometry request of X servers
===========================================================
Description:
============
Olivier Fourdan from Red Hat has discovered a protocol handling issue in
the way the X server code base handles the XkbSetGeometry request.

The issue stems from the server trusting the client to send valid string
lengths in the request data. A malicious client with string lengths
exceeding the request length can cause the server to copy adjacent
memory data into the XKB structs. This data is then available to the
client via the XkbGetGeometry request.
The data length is at least up to 64k, it is possible to obtain more
data by chaining strings, each string length is then determined by
whatever happens to be in that 16-bit region of memory.

A similarly crafted request can likely cause the X server to crash.

This issue has been assigned CVE-2015-0255

Affected Versions:
==================
This bug appears to have been introduced in X11R6.1 (March 1996) and is
thus believed to be present in every X server release since, including
the current stable releases 1.16.3 and 1.17.0

Fixes:
======
A fix is available via the patch linked below which is intended to be
included in xorg-server-1.16.4 and 1.17.1
http://cgit.freedesktop.org/xorg/xserver/commit/?id=20079c36cf7d377938ca5478447d8b9045cb7d43

Note that this patch requires another patch to apply without conflicts:
http://cgit.freedesktop.org/xorg/xserver/commit/?id=81c90dc8f0aae3b65730409b1b615b5fa7280ebd

Thanks:
=======
The X.Org Foundation thanks Olivier for bringing this issue to our
attention and providing the fixes.




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