RHSA-2014:0674 - Security Advisory

Topic

Updated rhev-hypervisor6 packages that fix multiple security issues,
several bugs, and add various enhancements are now available.

The Red Hat Security Response Team has rated this update as having Moderate
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.

Description

The rhev-hypervisor6 package provides a Red Hat Enterprise Virtualization
Hypervisor ISO disk image. The Red Hat Enterprise Virtualization Hypervisor
is a dedicated Kernel-based Virtual Machine (KVM) hypervisor.

Multiple integer overflow, input validation, logic error, and buffer
overflow flaws were discovered in various QEMU block drivers. An attacker
able to modify a disk image file loaded by a guest could use these flaws to
crash the guest, or corrupt QEMU process memory on the host, potentially
resulting in arbitrary code execution on the host with the privileges of
the QEMU process. (CVE-2014-0143, CVE-2014-0144, CVE-2014-0145,
CVE-2014-0147)

Multiple buffer overflow, input validation, and out-of-bounds write flaws
were found in the way the virtio, virtio-net, virtio-scsi, and usb drivers
of QEMU handled state loading after migration. 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-2013-4148, CVE-2013-4151, CVE-2013-4535, CVE-2013-4536, CVE-2013-4541,
CVE-2013-4542, CVE-2013-6399, CVE-2014-0182, CVE-2014-3461)

An out-of-bounds memory access flaw was found in the way QEMU's IDE device
driver handled the execution of SMART EXECUTE OFFLINE commands.
A privileged guest user could use this flaw to corrupt QEMU process memory
on the host, which could potentially result in arbitrary code execution on
the host with the privileges of the QEMU process. (CVE-2014-2894)

A buffer overflow flaw was found in the way the virtio_net_handle_mac()
function of QEMU processed guest requests to update the table of MAC
addresses. A privileged guest user could use this flaw to corrupt QEMU
process memory on the host, potentially resulting in arbitrary code
execution on the host with the privileges of the QEMU process.
(CVE-2014-0150)

A divide-by-zero flaw was found in the seek_to_sector() function of the
parallels block driver in QEMU. An attacker able to modify a disk image
file loaded by a guest could use this flaw to crash the guest.
(CVE-2014-0142)

A NULL pointer dereference flaw was found in the QCOW2 block driver in
QEMU. An attacker able to modify a disk image file loaded by a guest could
use this flaw to crash the guest. (CVE-2014-0146)

It was found that the block driver for Hyper-V VHDX images did not
correctly calculate BAT (Block Allocation Table) entries due to a missing
bounds check. An attacker able to modify a disk image file loaded by a
guest could use this flaw to crash the guest. (CVE-2014-0148)

The CVE-2014-0143 issues were discovered by Kevin Wolf and Stefan Hajnoczi
of Red Hat, the CVE-2014-0144 issues were discovered by Fam Zheng, Jeff
Cody, Kevin Wolf, and Stefan Hajnoczi of Red Hat, the CVE-2014-0145 issues
were discovered by Stefan Hajnoczi of Red Hat, the CVE-2014-0150 issue was
discovered by Michael S. Tsirkin of Red Hat, the CVE-2014-0142,
CVE-2014-0146, and CVE-2014-0147 issues were discovered by Kevin Wolf of
Red Hat, the CVE-2014-0148 issue was discovered by Jeff Cody of Red Hat,
and the CVE-2013-4148, CVE-2013-4151, CVE-2013-4535, CVE-2013-4536,
CVE-2013-4541, CVE-2013-4542, CVE-2013-6399, CVE-2014-0182, and
CVE-2014-3461 issues were discovered by Michael S. Tsirkin of Red Hat,
Anthony Liguori, and Michael Roth.

Other changes to the rhev-hypervisor6 component:

• The most recent builds of rhn-virtualization-common and

rhn-virtualization-host are included in version 3.4.0. (BZ#1095812)

All users of qemu-kvm-rhev 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.

Solution

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to use the
Red Hat Network to apply this update are available at
https://access.redhat.com/site/articles/11258

Affected Products

• Red Hat Virtualization 6 x86_64

Fixes

• BZ - 1063182 - [rhev-hypervisor6] Packaging for 3.4
• BZ - 1066334 - CVE-2013-4148 qemu: virtio-net: buffer overflow on invalid state load
• BZ - 1066342 - CVE-2013-4151 qemu: virtio: out-of-bounds buffer write on invalid state load
• BZ - 1066361 - CVE-2013-6399 qemu: virtio: buffer overrun on incoming migration
• BZ - 1066382 - CVE-2013-4542 qemu: virtio-scsi: buffer overrun on invalid state load
• BZ - 1066384 - CVE-2013-4541 qemu: usb: insufficient sanity checking of setup_index+setup_len in post_load
• BZ - 1066401 - CVE-2013-4535 CVE-2013-4536 qemu: virtio: insufficient validation of num_sg when mapping
• BZ - 1078201 - CVE-2014-0142 qemu: crash by possible division by zero
• BZ - 1078212 - CVE-2014-0148 Qemu: vhdx: bounds checking for block_size and logical_sector_size
• BZ - 1078232 - CVE-2014-0146 Qemu: qcow2: NULL dereference in qcow2_open() error path
• BZ - 1078846 - CVE-2014-0150 qemu: virtio-net: buffer overflow in virtio_net_handle_mac() function
• BZ - 1078848 - CVE-2014-0147 Qemu: block: possible crash due signed types or logic error
• BZ - 1078885 - CVE-2014-0145 Qemu: prevent possible buffer overflows
• BZ - 1079140 - CVE-2014-0143 Qemu: block: multiple integer overflow flaws
• BZ - 1079240 - CVE-2014-0144 Qemu: block: missing input validation
• BZ - 1087971 - CVE-2014-2894 QEMU: out of bounds buffer accesses, guest triggerable via IDE SMART
• BZ - 1088986 - CVE-2014-0182 qemu: virtio: out-of-bounds buffer write on state load with invalid config_len
• BZ - 1095812 - RHEV-H 20140407 - upgrade rhn-virtualization-* packages
• BZ - 1096821 - CVE-2014-3461 Qemu: usb: fix up post load checks

CVEs

• CVE-2014-0148
• CVE-2014-0145
• CVE-2014-0144
• CVE-2014-0147
• CVE-2014-0146
• CVE-2014-0143
• CVE-2014-0142
• CVE-2014-0150
• CVE-2013-4541
• CVE-2013-4542
• CVE-2014-0182
• CVE-2013-4535
• CVE-2013-4536
• CVE-2013-4151
• CVE-2013-4148
• CVE-2013-6399
• CVE-2014-3461
• CVE-2014-2894

References

• https://access.redhat.com/security/updates/classification/#moderate