====================================================================                   Red Hat Security Advisory

Synopsis:          Important: qemu-kvm security, bug fix, and enhancement update
Advisory ID:       RHSA-2015:0349-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2015:0349.html
Issue date:        2015-03-05
CVE Names:         CVE-2014-3640 CVE-2014-7815 CVE-2014-7840 
                   CVE-2014-8106 
====================================================================
1. Summary:

Updated qemu-kvm packages that fix multiple security issues, several bugs,
and add various enhancements are now available for Red Hat Enterprise
Linux 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:

Red Hat Enterprise Linux Client (v. 7) - x86_64
Red Hat Enterprise Linux Client Optional (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64
Red Hat Enterprise Linux Server (v. 7) - ppc64, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) - ppc64, x86_64
Red Hat Enterprise Linux Workstation (v. 7) - x86_64
Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64

3. Description:

KVM (Kernel-based Virtual Machine) is a full virtualization solution for
Linux on AMD64 and Intel 64 systems. The qemu-kvm packages provide the
user-space component for running virtual machines using KVM.

It was found that the Cirrus blit region checks were insufficient. A
privileged guest user could use this flaw to write outside of
VRAM-allocated buffer boundaries in the host's QEMU process address space
with attacker-provided data. (CVE-2014-8106)

An uninitialized data structure use flaw was found in the way the
set_pixel_format() function sanitized the value of bits_per_pixel. An
attacker able to access a guest's VNC console could use this flaw to crash
the guest. (CVE-2014-7815)

It was found that certain values that were read when loading RAM during
migration were not validated. A user able to alter the savevm data (either
on the disk or over the wire during migration) could use either of these
flaws to corrupt QEMU process memory on the (destination) host, which could
potentially result in arbitrary code execution on the host with the
privileges of the QEMU process. (CVE-2014-7840)

A NULL pointer dereference flaw was found in the way QEMU handled UDP
packets with a source port and address of 0 when QEMU's user networking was
in use. A local guest user could use this flaw to crash the guest.
(CVE-2014-3640)

Red Hat would like to thank James Spadaro of Cisco for reporting
CVE-2014-7815, and Xavier Mehrenberger and Stephane Duverger of Airbus for
reporting CVE-2014-3640. The CVE-2014-8106 issue was found by Paolo Bonzini
of Red Hat, and the CVE-2014-7840 issue was discovered by Michael S.
Tsirkin of Red Hat.

Bug fixes:

* The KVM utility executed demanding routing update system calls every time
it performed an MSI vector mask/unmask operation. Consequently, guests
running legacy systems such as Red Hat Enterprise Linux 5 could, under
certain circumstances, experience significant slowdown. Now, the routing
system calls during mask/unmask operations are skipped, and the performance
of legacy guests is now more consistent. (BZ#1098976)

* Due to a bug in the Internet Small Computer System Interface (iSCSI)
driver, a qemu-kvm process terminated unexpectedly with a segmentation
fault when the "write same" command was executed in guest mode under the
iSCSI protocol. This update fixes the bug, and the "write same" command now
functions in guest mode under iSCSI as intended. (BZ#1083413)

* The QEMU command interface did not properly handle resizing of cache
memory during guest migration, causing QEMU to terminate unexpectedly with
a segmentation fault. This update fixes the related code, and QEMU no
longer crashes in the described situation. (BZ#1066338)

Enhancements:

* The maximum number of supported virtual CPUs (vCPUs) in a KVM guest has
been increased to 240. This increases the number of virtual processing
units that the user can assign to the guest, and therefore improves its
performance potential. (BZ#1134408)

* Support for the 5th Generation Intel Core processors has been added to
the QEMU hypervisor, the KVM kernel code, and the libvirt API. This allows
KVM guests to use the following instructions and features: ADCX, ADOX,
RDSFEED, PREFETCHW, and supervisor mode access prevention (SMAP).
(BZ#1116117)

* The "dump-guest-memory" command now supports crash dump compression. This
makes it possible for users who cannot use the "virsh dump" command to
require less hard disk space for guest crash dumps. In addition, saving a
compressed guest crash dump frequently takes less time than saving a
non-compressed one. (BZ#1157798)

* This update introduces support for flight recorder tracing, which uses
SystemTap to automatically capture qemu-kvm data while the guest machine is
running. For detailed instructions on how to configure and use flight
recorder tracing, see the Virtualization Deployment and Administration
Guide, linked to in the References section below. (BZ#1088112)

4. Solution:

All qemu-kvm users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues and add these
enhancements. 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:

https://access.redhat.com/articles/11258

5. Bugs fixed (https://bugzilla.redhat.com/):

895436 - qemu-kvm core dump when guest do S3/S4 with max(232) virtio block devices (multifunction=on)
949385 - passthrough USB speaker to win2012 guest fail to work well
980747 - flood with 'xhci: wrote doorbell while xHC stopped or paused' when redirected USB Webcam from usb-host with xHCI controller
980833 - xhci: FIXME: endpoint stopped w/ xfers running, data might be lost
990724 - qemu-kvm failing when invalid machine type is provided
996011 - vlan and queues options cause core dumped when qemu-kvm process quit(or ctrl+c)
999789 - qemu should give a more friendly prompt when didn't specify read-only for VMDK format disk
1002493 - qemu-img convert rate about 100k/second from qcow2/raw to vmdk format on nfs system file
1017685 - Gluster etc. should not be a dependency of vscclient and libcacard
1021788 - the error message "scsi generic interface too old" is wrong more often than not
1026314 - BUG: qemu-kvm hang when use '-sandbox on'+'vnc'+'hda'
1027565 - fail to reboot guest after migration from RHEL6.5 host to RHEL7.0 host
1029271 - Format specific information (create type) was wrong when create it specified subformat='streamOptimized'
1038914 - Guest can't receive any character transmitted from host after hot unplugging virtserialport then hot plugging again
1039791 - qemu-img creates truncated VMDK image with subformat=twoGbMaxExtentFlat
1046574 - fail to passthrough the USB speaker redirected from usb-redir with xhci controller
1046873 - fail to be recognized the hotpluging usb-storage device with xhci controller in win2012R2 guest
1049734 - PCI: QEMU crash on illegal operation: attaching a function to a non multi-function device
1052093 - qcow2 corruptions (leaked clusters after installing a rhel7 guest using virtio_scsi)
1054077 - qemu crash when reboot win7 guest with spice display
1064156 - [qxl] The guest show black screen while resumed guest which managedsaved in pmsuspended status.
1064647 - qemu-kvm core dump when hot-plug virtio-blk-pci device with gluster backend
1066338 - Reduce the migrate cache size during migration causes qemu segment fault
1074219 - qemu core dump when install a RHEL.7 guest(xhci) with migration
1074403 - qemu-kvm can not give any warning hint when set sndbuf with negative value
1074913 - migration can not finish with 1024k 'remaining ram' left after hotunplug 4 nics
1075846 - qemu-kvm core dumped when hotplug/unhotplug USB3.0 device multi times
1076326 - qemu-kvm does not quit when booting guest w/ 161 vcpus and "-no-kvm"
1079147 - [WHQL][balloon][virtio-rng]ob named DPWLK-HotADD-Device Test- Verify dirver support  for Hot-Add CPU made win2k8-R2 BSOD (0x7E)
1083413 - qemu-kvm: iSCSI: Failure. SENSE KEY:ILLEGAL_REQUEST(5) ASCQ:INVALID_FIELD_IN_CDB(0x2400)
1085701 - Guest hits call trace migrate from RHEL6.5 to RHEL7.0 host with -M 6.1 & balloon & uhci device
1086598 - migrate_cancel wont take effect on previouly wrong migrate -d cmd
1086987 - src qemu crashed when starting migration in inmigrate mode
1088116 - qemu crash when device_del usb-redir
1088150 - qemu-img coredumpd when try to create a gluster format image
1088176 - QEMU fail to check whether duplicate ID for block device drive using 'blockdev-add' to hotplug
1088695 - there are four "gluster" in qemu-img supported format list
1088822 - hot-plug a virtio-scsi disk via 'blockdev-add' always cause QEMU quit
1089606 - QEMU will not reject invalid number of queues (num_queues = 0) specified for virtio-scsi
1093983 - there are three "nbd" in qemu-img supported format list
1094285 - Hot plug CPU not working with RHEL6  machine types running on RHEL7 host.
1095645 - vectors of virtio-scsi-pci will be 0 when set vectors>=129
1096576 - QEMU core dumped when boot up two scsi-hd disk on the same virtio-scsi-pci controller in Intel host
1097020 - [RFE] qemu-img: Add/improve Disk2VHD tools creating VHDX images
1097363 - qemu ' KVM internal error. Suberror: 1'  when  query cpu frequently during pxe boot in Intel "Q95xx" host
1098086 - RFE: Supporting creating vmdk/vdi/vpc format disk with protocols (glusterfs)
1104748 - 48% reduction in IO performance for KVM guest, io=native
1107821 - rdma migration: seg if destination isn't listening
1111450 - Guest crash when hotplug usb while disable virt_use_usb
1113009 - Migration failed with virtio-blk from RHEL6.5.0 host to RHEL7.0 host
1116728 - Backport qemu_bh_schedule() race condition fix
1116941 - Return value of virtio_load not checked in virtio_rng_load
1118707 - VMstate static checker: backport -dump-vmstate feature to export json-encoded vmstate info
1122151 - Pass close from qemu-ga
1123372 - qemu-kvm crashed when doing iofuzz testing
1130428 - After migration of RHEL7.1 guest with "-vga qxl", GUI console is hang
1131316 - fail to specify wwn for virtual IDE CD-ROM
1134237 - Opening malformed VMDK description file should fail
1134241 - QEMU fails to correctly read/write on VMDK with big flat extent
1134251 - Opening an obviously truncated VMDK image should fail
1134283 - qemu-img convert from ISO to streamOptimized fails
1138639 - fail to login spice session with password + expire time
1138691 - Allow qemu-img to bypass the host cache (check, compare, convert, rebase, amend)
1140618 - Should replace "qemu-system-i386" by "/usr/libexec/qemu-kvm" in manpage of qemu-kvm for our official qemu-kvm build
1140742 - Enable native qemu support for Ceph
1141667 - Qemu crashed if reboot guest after hot remove AC97 sound device
1142290 - guest is stuck when setting balloon memory with large guest-stats-polling-interval
1144818 - CVE-2014-3640 qemu: slirp: NULL pointer deref in sosendto()
1155518 - qemu-kvm: undefined symbol: glfs_discard_async
1157641 - CVE-2014-7815 qemu: vnc: insufficient bits_per_pixel from the client sanitization
1160237 - qemu-img convert intermittently corrupts output images
1161563 - invalid QEMU NOTEs in vmcore that is dumped for multi-VCPU guests
1163075 - CVE-2014-7840 qemu: insufficient parameter validation during ram load
1169454 - CVE-2014-8106 qemu: cirrus: insufficient blit region checks
1175325 - Delete cow block driver
1180942 - qemu core dumped when unhotplug gpu card assigned to guest

6. Package List:

Red Hat Enterprise Linux Client (v. 7):

Source:
qemu-kvm-1.5.3-86.el7.src.rpm

x86_64:
libcacard-1.5.3-86.el7.i686.rpm
libcacard-1.5.3-86.el7.x86_64.rpm
qemu-img-1.5.3-86.el7.x86_64.rpm
qemu-kvm-1.5.3-86.el7.x86_64.rpm
qemu-kvm-common-1.5.3-86.el7.x86_64.rpm
qemu-kvm-debuginfo-1.5.3-86.el7.i686.rpm
qemu-kvm-debuginfo-1.5.3-86.el7.x86_64.rpm
qemu-kvm-tools-1.5.3-86.el7.x86_64.rpm

Red Hat Enterprise Linux Client Optional (v. 7):

x86_64:
libcacard-devel-1.5.3-86.el7.i686.rpm
libcacard-devel-1.5.3-86.el7.x86_64.rpm
libcacard-tools-1.5.3-86.el7.x86_64.rpm
qemu-kvm-debuginfo-1.5.3-86.el7.i686.rpm
qemu-kvm-debuginfo-1.5.3-86.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional (v. 7):

Source:
qemu-kvm-1.5.3-86.el7.src.rpm

x86_64:
libcacard-1.5.3-86.el7.i686.rpm
libcacard-1.5.3-86.el7.x86_64.rpm
libcacard-devel-1.5.3-86.el7.i686.rpm
libcacard-devel-1.5.3-86.el7.x86_64.rpm
libcacard-tools-1.5.3-86.el7.x86_64.rpm
qemu-img-1.5.3-86.el7.x86_64.rpm
qemu-kvm-1.5.3-86.el7.x86_64.rpm
qemu-kvm-common-1.5.3-86.el7.x86_64.rpm
qemu-kvm-debuginfo-1.5.3-86.el7.i686.rpm
qemu-kvm-debuginfo-1.5.3-86.el7.x86_64.rpm
qemu-kvm-tools-1.5.3-86.el7.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
qemu-kvm-1.5.3-86.el7.src.rpm

ppc64:
qemu-img-1.5.3-86.el7.ppc64.rpm
qemu-kvm-debuginfo-1.5.3-86.el7.ppc64.rpm

x86_64:
libcacard-1.5.3-86.el7.i686.rpm
libcacard-1.5.3-86.el7.x86_64.rpm
qemu-img-1.5.3-86.el7.x86_64.rpm
qemu-kvm-1.5.3-86.el7.x86_64.rpm
qemu-kvm-common-1.5.3-86.el7.x86_64.rpm
qemu-kvm-debuginfo-1.5.3-86.el7.i686.rpm
qemu-kvm-debuginfo-1.5.3-86.el7.x86_64.rpm
qemu-kvm-tools-1.5.3-86.el7.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 7):

ppc64:
libcacard-1.5.3-86.el7.ppc.rpm
libcacard-1.5.3-86.el7.ppc64.rpm
libcacard-devel-1.5.3-86.el7.ppc.rpm
libcacard-devel-1.5.3-86.el7.ppc64.rpm
libcacard-tools-1.5.3-86.el7.ppc64.rpm
qemu-kvm-debuginfo-1.5.3-86.el7.ppc.rpm
qemu-kvm-debuginfo-1.5.3-86.el7.ppc64.rpm

x86_64:
libcacard-devel-1.5.3-86.el7.i686.rpm
libcacard-devel-1.5.3-86.el7.x86_64.rpm
libcacard-tools-1.5.3-86.el7.x86_64.rpm
qemu-kvm-debuginfo-1.5.3-86.el7.i686.rpm
qemu-kvm-debuginfo-1.5.3-86.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
qemu-kvm-1.5.3-86.el7.src.rpm

x86_64:
libcacard-1.5.3-86.el7.i686.rpm
libcacard-1.5.3-86.el7.x86_64.rpm
qemu-img-1.5.3-86.el7.x86_64.rpm
qemu-kvm-1.5.3-86.el7.x86_64.rpm
qemu-kvm-common-1.5.3-86.el7.x86_64.rpm
qemu-kvm-debuginfo-1.5.3-86.el7.i686.rpm
qemu-kvm-debuginfo-1.5.3-86.el7.x86_64.rpm
qemu-kvm-tools-1.5.3-86.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 7):

x86_64:
libcacard-devel-1.5.3-86.el7.i686.rpm
libcacard-devel-1.5.3-86.el7.x86_64.rpm
libcacard-tools-1.5.3-86.el7.x86_64.rpm
qemu-kvm-debuginfo-1.5.3-86.el7.i686.rpm
qemu-kvm-debuginfo-1.5.3-86.el7.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2014-3640
https://access.redhat.com/security/cve/CVE-2014-7815
https://access.redhat.com/security/cve/CVE-2014-7840
https://access.redhat.com/security/cve/CVE-2014-8106
https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Virtualization_Deployment_and_Administration_Guide/index.html

8. Contact:

The Red Hat security contact is . More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2015 Red Hat, Inc.