Xen.org security team
2014-Apr-23 15:13 UTC
Xen Security Advisory 94 (CVE-2014-2986) - ARM hypervisor crash on guest interrupt controller access
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Xen Security Advisory CVE-2014-2986 / XSA-94
version 2
ARM hypervisor crash on guest interrupt controller access
UPDATES IN VERSION 2
===================
This issue has been assigned CVE-2014-2986.
ISSUE DESCRIPTION
================
When handling a guest access to the virtual GIC distributor (interrupt
controller) Xen could dereference a pointer before checking it for
validity leading to a hypervisor crash and host Denial of Service.
IMPACT
=====
A buggy or malicious guest can crash the host.
VULNERABLE SYSTEMS
=================
Both 32- and 64-bit ARM systems are vulnerable from Xen 4.4 onward.
x86 systems are not vulnerable.
MITIGATION
=========
None.
NOTE REGARDING LACK OF EMBARGO
=============================
This bug was publicly reported on xen-devel, before it was appreciated
that there was a security problem.
CREDITS
======
The initial bug was discovered by Thomas Leonard and the security
aspect was diagnosed by Julien Grall.
RESOLUTION
=========
Applying the appropriate attached patch resolves this issue.
xsa94.patch xen-unstable, Xen 4.4.x
$ sha256sum xsa94*.patch
ad0f20577400756a1786daeafef86fa870727ec35b48f71f565e4a30dcbda58d xsa94.patch
$
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.12 (GNU/Linux)
iQEcBAEBAgAGBQJTV9hdAAoJEIP+FMlX6CvZmDwH/2sBH/w9kPhOu+hdOAMX3dlb
bmj1sLTehOKqEy8sZpDsCuJw8cRAIQn+xWPMDPj2lUggz5iVWHUgfs4Zk8o9l3qQ
9/RcnQQHFSw1Bu8lDLlH0FpE6R98ZcdX//PAviJewj10FiMOpIoBSzNpKLxst1IZ
5YPmBVCn6DfgsCjWYPPaGQMLtBWU/LbAPmpYUiIDywOd58OScekNL2hfKM0ZWzgo
HPuB2DwpPsj7P43kuEJyXIHYLu00see+uEXXKd591mmznVtSXSrzVVaKPjeTfh9D
WEGqCxOof5slzwofbMFflBL1SW6d6f0Llui/7cMEDITSXeCaP2wqMb34p/g68+w=BNcq
-----END PGP SIGNATURE-----
_______________________________________________
Xen-users mailing list
Xen-users@lists.xen.org
http://lists.xen.org/xen-users