Home page logo
/

oss-sec logo oss-sec mailing list archives

Xen Security Advisory 26 (CVE-2012-5510) - Grant table version switch list corruption vulnerability
From: Xen.org security team <security () xen org>
Date: Mon, 03 Dec 2012 17:51:42 +0000

-----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-----

Attachment: xsa26-4.1.patch
Description:

Attachment: xsa26-4.2.patch
Description:

Attachment: xsa26-unstable.patch
Description:


  By Date           By Thread  

Current thread:
  • Xen Security Advisory 26 (CVE-2012-5510) - Grant table version switch list corruption vulnerability Xen . org security team (Dec 03)
[ Nmap | Sec Tools | Mailing Lists | Site News | About/Contact | Advertising | Privacy ]