(Red Hat Issues Fix for Red Hat Enterprise Virtualization Hypervisor) QEMU i8254 PIT Emulation Bug Lets Local Users Gain Elevated Privileges
SecurityTracker Alert ID: 1033079|
SecurityTracker URL: http://securitytracker.com/id/1033079
(Links to External Site)
Date: Jul 27 2015
Execution of arbitrary code via local system, User access via local system|
Fix Available: Yes Vendor Confirmed: Yes |
A vulnerability was reported in QEMU. A local user on the guest system can obtain elevated privileges on the target host system. Red Hat Enterprise Virtualization Hypervisor is affected.|
A local privileged user on a guest system that has QEMU programmable interval timer (PIT) enabled [not the default configuration] can issue a specially crafted read request from the PIT Mode/Command register to obtain potentially sensitive information or cause memory corruption and execute arbitrary code on the target host system.
The vulnerability resides in the uint64_t pit_ioport_read(() function in '/hw/timer/i8254.c'.
Matt Tait of Google's Project Zero security team reported this vulnerability.
A local privileged user on a guest system can obtain privileges on the target host system.|
Red Hat has issued a fix for Red Hat Enterprise Virtualization.|
The Red Hat advisory is available at:
Vendor URL: rhn.redhat.com/errata/RHSA-2015-1508.html (Links to External Site)
Access control error|
This archive entry is a follow-up to the message listed below.|
Source Message Contents
Subject: [RHSA-2015:1508-01] Important: qemu-kvm-rhev security update|
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Red Hat Security Advisory
Synopsis: Important: qemu-kvm-rhev security update
Advisory ID: RHSA-2015:1508-01
Product: Red Hat Enterprise Virtualization
Advisory URL: https://rhn.redhat.com/errata/RHSA-2015-1508.html
Issue date: 2015-07-27
CVE Names: CVE-2015-3214 CVE-2015-5154
Updated qemu-kvm-rhev packages that fix two security issues are now
available for Red Hat Enterprise Virtualization Hypervisor 7.
Red Hat Product Security has rated this update as having Important security
impact. Common Vulnerability Scoring System (CVSS) base scores, which give
detailed severity ratings, are available for each vulnerability from the
CVE links in the References section.
2. Relevant releases/architectures:
RHEV-H and VDSM for 7 Hosts - x86_64
KVM (Kernel-based Virtual Machine) is a full virtualization solution for
Linux on AMD64 and Intel 64 systems. The qemu-kvm-rhev package provides the
user-space component for running virtual machines using KVM.
A heap buffer overflow flaw was found in the way QEMU's IDE subsystem
handled I/O buffer access while processing certain ATAPI commands.
A privileged guest user in a guest with the CDROM drive enabled could
potentially use this flaw to execute arbitrary code on the host with the
privileges of the host's QEMU process corresponding to the guest.
An out-of-bounds memory access flaw, leading to memory corruption or
possibly an information leak, was found in QEMU's pit_ioport_read()
function. A privileged guest user in a QEMU guest, which had QEMU PIT
emulation enabled, could potentially, in rare cases, use this flaw to
execute arbitrary code on the host with the privileges of the hosting QEMU
Red Hat would like to thank Matt Tait of Google's Project Zero security
team for reporting the CVE-2015-3214 issue. The CVE-2015-5154 issue was
discovered by Kevin Wolf of Red Hat.
All qemu-kvm-rhev users are advised to upgrade to these updated packages,
which contain a backported patch to correct this issue. After installing
this update, shut down all running virtual machines. Once all virtual
machines have shut down, start them again for this update to take effect.
Before applying this update, make sure all previously released errata
relevant to your system have been applied.
For details on how to apply this update, refer to:
5. Bugs fixed (https://bugzilla.redhat.com/):
1229640 - CVE-2015-3214 qemu/kvm: i8254: out-of-bounds memory access in pit_ioport_read function
1243563 - CVE-2015-5154 qemu: ide: atapi: heap overflow during I/O buffer memory access
6. Package List:
RHEV-H and VDSM for 7 Hosts:
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
The Red Hat security contact is <firstname.lastname@example.org>. More contact
details at https://access.redhat.com/security/team/contact/
Copyright 2015 Red Hat, Inc.
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