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Message-Id: <E1Wcws9-0005ae-0x@xenbits.xen.org>
Date: Wed, 23 Apr 2014 13:05:57 +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 94 - ARM hypervisor crash on guest
interrupt controller access
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Xen Security Advisory XSA-94
ARM hypervisor crash on guest interrupt controller access
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
$
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Download attachment "xsa94.patch" of type "application/octet-stream" (1164 bytes)
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