Openwall GNU/*/Linux - a small security-enhanced Linux distro for servers
[<prev] [next>] [day] [month] [year] [list]
Date: Mon, 03 Dec 2012 17:51:42 +0000
From: Xen.org security team <security@....org>
To: xen-announce@...ts.xen.org, xen-devel@...ts.xen.org,
 xen-users@...ts.xen.org, oss-security@...ts.openwall.com
CC: Xen.org security team <security@....org>
Subject: Xen Security Advisory 26 (CVE-2012-5510) - Grant table version
 switch list corruption vulnerability

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

	     Xen Security Advisory CVE-2012-5510 / XSA-26
                             version 3

       Grant table version switch list corruption vulnerability

UPDATES IN VERSION 3
====================

Public release.

ISSUE DESCRIPTION
=================

Downgrading the grant table version of a guest involves freeing its
status pages. This freeing was incomplete - the page(s) are freed back
to the allocator, but not removed from the domain's tracking
list. This would cause list corruption, eventually leading to a
hypervisor crash.

IMPACT
======

A malicious guest administrator can cause Xen to crash, leading to a
denial of service attack.

VULNERABLE SYSTEMS
==================

All Xen version from 4.0 on are vulnerable.

Version 3.4 and earlier are not vulnerable.

MITIGATION
==========

Running only guests with trusted kernels will avoid this vulnerability.

RESOLUTION
==========

Applying the appropriate attached patch resolves this issue.

xsa26-4.1.patch             Xen 4.1.x
xsa26-4.2.patch             Xen 4.2.x
xsa26-unstable.patch        xen-unstable


$ sha256sum xsa26*.patch
b4674ddaf9a9786d5e7e5e4f248f6095e118184df581036e0531b5db5e1d645b  xsa26-4.1.patch
a6e2ed7bae3e62d4294fdb48e8a5418b1de8e0e690f4fea4bb430d2b7cf758e6  xsa26-4.2.patch
ac2d5a82f0dba0f4213607a0e3bb9be586d90173bbadc4b402c2f19fbe4b2cf3  xsa26-unstable.patch
$
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.10 (GNU/Linux)

iQEcBAEBAgAGBQJQvOJ1AAoJEIP+FMlX6CvZBHIH/jI42gGLsThzGlgkFg2aqE74
EUKIPZE4DLQNl6oTQ/fp0dfJgsQ8XHldovl4EphWK+oO0osloE2HjAY5mesOraui
IIQHRkbosbDshDcSqFDndl+xjAEk1ohlGMMpSdUImIHdFF8ZJneXdK11cqxMtCKR
27ych3lDViqy0OqxFGRZpsBE0hHqU7aiL8Orr+tI4sANnd/qVfZcdqizoTRuAJX3
KOmaq+8VwoRSeppAvVgcnGkDLyCd5udRLNEenjrFo1YkC01bVIdbD59/ZwEIC6eZ
iR7bvppV1nuq9WnbCkx+FVkNc9AuGwUZMOdePH2PwLYqIZGMBi9uqUD3Y0HHMoo=
=OtT0
-----END PGP SIGNATURE-----

Download attachment "xsa26-4.1.patch" of type "application/octet-stream" (3932 bytes)

Download attachment "xsa26-4.2.patch" of type "application/octet-stream" (3814 bytes)

Download attachment "xsa26-unstable.patch" of type "application/octet-stream" (3820 bytes)

Powered by blists - more mailing lists

Your e-mail address:

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.